feat(v3): add v3 stack — backend rewrite, renamed env vars, docs

- New Go backend binary (backend + runner) replacing old scraper/
- Rename SCRAPER_API_URL → BACKEND_API_URL in UI env and docker-compose
- Rename scraperFetch → backendFetch across all 19 UI server files
- Remove SCRAPER_PROXY env var and proxy transport from browser.Config
- Add Meilisearch, Valkey, Caddy to docker-compose
- Add docs/: api-endpoints.md, request-flow.mermaid.md, data-flow.mermaid.md

v3/Caddyfile

@@ -0,0 +1,83 @@
+# v3/Caddyfile
+#
+# Caddy reverse proxy for LibNovel v3.
+#
+# Environment variables consumed (set in docker-compose.yml):
+#   DOMAIN              — public hostname, e.g. libnovel.example.com
+#                         Use "localhost" for local dev (no TLS cert attempted).
+#   CADDY_ACME_EMAIL    — Let's Encrypt notification email (empty = no email)
+#
+# Routing rules:
+#   /health                        → backend:8080  (liveness probe)
+#   /scrape*                       → backend:8080  (scrape task creation)
+#   /api/browse                    → backend:8080  (MinIO-cached browse pages)
+#   /api/book-preview/*            → backend:8080  (live scrape, no store write)
+#   /api/chapter-text-preview/*/*  → backend:8080  (live chapter, no store write)
+#   /api/chapter-text/*/*          → backend:8080  (chapter markdown from MinIO)
+#   /api/reindex/*                 → backend:8080  (rebuild chapter index)
+#   /api/cover/*                   → backend:8080  (proxy cover image)
+#   /api/audio-proxy/*/*           → backend:8080  (proxy generated audio)
+#   /api/scrape/*                  → backend:8080  (scrape job status/tasks)
+#   /*  (everything else)          → ui:3000       (SvelteKit — handles all
+#                                                   remaining /api/* routes too)
+#
+# The SvelteKit UI itself proxies to the backend for: ranking, voices, search,
+# browse-page, presign, audio, progress, and the Go /api/progress endpoint.
+# MinIO and PocketBase are NOT exposed publicly.
+{
+	# Email for Let's Encrypt ACME account registration.
+	# Optional — omit to use an anonymous ACME account.
+	{$CADDY_ACME_EMAIL:}
+}
+
+{$DOMAIN:localhost} {
+	# ── Liveness probe ───────────────────────────────────────────────────────
+	handle /health {
+		reverse_proxy backend:8080
+	}
+
+	# ── Scrape task creation (Go backend only) ───────────────────────────────
+	handle /scrape* {
+		reverse_proxy backend:8080
+	}
+
+	# ── Backend-only API paths ────────────────────────────────────────────────
+	# These paths are served exclusively by the Go scraper and are not
+	# implemented in the SvelteKit UI.
+	handle /api/browse {
+		reverse_proxy backend:8080
+	}
+	handle /api/book-preview/* {
+		reverse_proxy backend:8080
+	}
+	handle /api/chapter-text-preview/* {
+		reverse_proxy backend:8080
+	}
+	handle /api/chapter-text/* {
+		reverse_proxy backend:8080
+	}
+	handle /api/reindex/* {
+		reverse_proxy backend:8080
+	}
+	handle /api/cover/* {
+		reverse_proxy backend:8080
+	}
+	handle /api/audio-proxy/* {
+		reverse_proxy backend:8080
+	}
+	handle /api/scrape/* {
+		reverse_proxy backend:8080
+	}
+
+	# ── SvelteKit UI (catch-all — includes all remaining /api/* routes) ───────
+	handle {
+		reverse_proxy ui:3000
+	}
+
+	# ── Logging ──────────────────────────────────────────────────────────────
+	log {
+		output stdout
+		format json
+	}
+}
+}

v3/TODO.md

@@ -0,0 +1,215 @@
+# v3 Implementation Plan
+
+v3 is a self-contained directory. All services live under `v3/`. Nothing shares
+code with the root `backend/` or `ui-v2/` directories.
+
+## New in v3 vs v2
+
+| Addition | Why |
+|----------|-----|
+| **Caddy** reverse proxy | Single public entry point, automatic HTTPS via Let's Encrypt, no manual cert management |
+| **Meilisearch** | Full-text search over locally scraped books; replaces live novelfire.net scrape on every search |
+| **Valkey** (Redis-compatible) | Shared presign URL cache; replaces the per-process in-memory Map in the UI Node process |
+| **Runner `/metrics` HTTP endpoint** | Exposes task counters (pending, running, failed, completed) for healthcheck / Caddy visibility |
+
+## Directory layout (target)
+
+```
+v3/
+├── backend/                   # copied from ../backend/, then modified
+│   ├── cmd/
+│   │   ├── backend/           # unchanged
+│   │   └── runner/            # add metrics HTTP server
+│   ├── internal/
+│   │   ├── backend/
+│   │   │   ├── server.go      # add /api/search endpoint (Meilisearch)
+│   │   │   └── handlers.go    # add searchHandler, presign now reads Valkey
+│   │   ├── runner/
+│   │   │   ├── runner.go      # add atomic counters + metrics HTTP server
+│   │   │   └── metrics.go     # NEW: MetricsServer (net/http, /metrics JSON)
+│   │   ├── meili/             # NEW: Meilisearch client package
+│   │   │   └── client.go
+│   │   ├── presigncache/      # NEW: Valkey-backed presign cache
+│   │   │   └── cache.go
+│   │   └── config/
+│   │       └── config.go      # add Meilisearch + Valkey + metrics addr vars
+│   └── go.mod                 # add meilisearch-go, go-redis/v9
+├── ui/                        # copied from ../ui-v2/, then modified
+│   └── src/lib/server/
+│       └── presignCache.ts    # replace in-process Map with Valkey (ioredis)
+├── docs/
+│   ├── architecture.d2        # DONE
+│   └── architecture.mermaid.md # DONE
+├── scripts/
+│   └── pb-init-v3.sh          # same as v2 unless schema changes
+├── Caddyfile                  # NEW
+├── docker-compose.yml         # NEW
+└── TODO.md                    # this file
+```
+
+---
+
+## Tasks
+
+### 1. Copy source trees
+
+- [ ] `cp -r ../backend v3/backend`
+- [ ] `cp -r ../ui-v2 v3/ui`
+- [ ] `cp ../scripts/pb-init-v2.sh v3/scripts/pb-init-v3.sh`
+- [ ] Verify `v3/backend/go.mod` module path is still `github.com/libnovel/backend`
+  (no rename needed — it's a copy, not a Go workspace dep)
+
+### 2. Add Valkey presign cache (`v3/backend`)
+
+**Goal**: Backend generates presigned URLs → stores in Valkey with TTL.
+UI reads from Valkey before calling backend.
+
+Files to create/modify:
+
+- [ ] `internal/presigncache/cache.go` — `Cache` interface + `ValkeyCache` implementation
+  - `Get(ctx, key) (string, bool, error)`
+  - `Set(ctx, key, url string, ttl time.Duration) error`
+  - Uses `github.com/redis/go-redis/v9`
+  - TTL: match presigned URL lifetime (e.g. 45 min; MinIO default is 1h → use 55 min)
+- [ ] `internal/config/config.go` — add `ValkeyAddr string` (default `"valkey:6379"`)
+- [ ] `internal/backend/server.go` — add `PresignCache presigncache.Cache` to `Dependencies`
+- [ ] `internal/backend/handlers.go` — in presign handlers, do `cache.Get` before generating,
+  `cache.Set` after generating
+- [ ] `go.mod` — add `github.com/redis/go-redis/v9`
+- [ ] `cmd/backend/main.go` — wire `ValkeyCache` from config
+
+### 3. Add Meilisearch integration (`v3/backend`)
+
+**Goal**: On each book scrape completion, upsert the book document into Meilisearch.
+Backend `/api/search` returns Meilisearch results for local books, falling back to
+novelfire.net live search for books not in the index.
+
+Files to create/modify:
+
+- [ ] `internal/meili/client.go` — `Client` interface + `MeiliClient` implementation
+  - `UpsertBook(ctx, book domain.Book) error`
+  - `Search(ctx, query string, limit int) ([]domain.Book, error)`
+  - Uses `github.com/meilisearch/meilisearch-go`
+  - Index name: `books`, primary key: `slug`
+  - Searchable attributes: `title`, `author`, `tags`, `description`
+  - Filterable attributes: `status`, `tags`
+- [ ] `internal/config/config.go` — add `MeiliURL string`, `MeiliAPIKey string`
+- [ ] `internal/bookstore/bookstore.go` — add `SearchIndex` interface with `UpsertBook`
+- [ ] `internal/runner/runner.go` — inject `SearchIndex`; after `FinishScrapeTask` success,
+  call `SearchIndex.UpsertBook` for each book scraped
+- [ ] `internal/backend/server.go` — add `SearchIndex` to `Dependencies`; register `GET /api/search`
+- [ ] `internal/backend/handlers.go` — `searchHandler`: query Meilisearch first; if 0 results,
+  fall back to novelfire.net live search via `NovelScraper.SearchBooks`
+- [ ] `go.mod` — add `github.com/meilisearch/meilisearch-go`
+- [ ] `cmd/backend/main.go` + `cmd/runner/main.go` — wire `MeiliClient`
+
+### 4. Add runner `/metrics` HTTP endpoint (`v3/backend`)
+
+**Goal**: Runner exposes `GET /metrics` returning JSON with task counters. Caddy can
+healthcheck this; operators can scrape it from a monitoring tool.
+
+Payload example:
+```json
+{
+  "tasks_pending":    0,
+  "tasks_running":    1,
+  "tasks_completed": 42,
+  "tasks_failed":     2,
+  "uptime_seconds": 3600
+}
+```
+
+Files to create/modify:
+
+- [ ] `internal/runner/metrics.go` — `Metrics` struct with `atomic.Int64` counters;
+  `ServeHTTP` handler returns JSON; `MetricsServer` starts `net/http` on configurable addr
+- [ ] `internal/runner/runner.go` — embed `*Metrics`; increment counters at task lifecycle
+  points (claimed → running → completed/failed)
+- [ ] `internal/config/config.go` — add `RunnerMetricsAddr string` (default `":9091"`)
+- [ ] `cmd/runner/main.go` — start `MetricsServer` in background goroutine before `runner.Run`
+- [ ] `docker-compose.yml` (runner service) — expose port 9091 internally; update healthcheck
+  to `GET http://localhost:9091/metrics` (replaces file-based liveness)
+
+### 5. Update UI presign cache to use Valkey (`v3/ui`)
+
+**Goal**: Replace `src/lib/server/presignCache.ts` (module-scope `Map`) with Valkey via
+`ioredis`. Cache survives UI restarts and is shared if multiple UI replicas run.
+
+Files to modify:
+
+- [ ] `src/lib/server/presignCache.ts` — rewrite to use `ioredis` client
+  - `getPresignedUrl(key: string): Promise<string | null>`
+  - `setPresignedUrl(key: string, url: string, ttlSeconds: number): Promise<void>`
+  - Connection string from `VALKEY_URL` env var (default `redis://valkey:6379`)
+  - Keep the same TTL logic (50 min) and sweep logic (not needed — Valkey TTL is native)
+- [ ] `package.json` — add `ioredis` (or use `@redis/client` — prefer `ioredis` for its
+  robust reconnection handling)
+- [ ] Any callers of old `presignCache` — update import if interface changes
+
+### 6. Write `v3/Caddyfile`
+
+- [ ] Global options block: email for ACME, staging CA override for local dev
+- [ ] Single site block matching `{$DOMAIN}` (env var injection):
+  - `handle /api/*` → `reverse_proxy backend:8080`
+  - `handle /health` → `reverse_proxy backend:8080`
+  - `handle /s3/*` → strip prefix + `reverse_proxy minio:9000` (internal bucket access,
+    requires `Authorization` passthrough)
+  - `handle` (catch-all) → `reverse_proxy ui:3000`
+- [ ] Health/liveness endpoints exposed without auth
+- [ ] No ports on MinIO/PocketBase exposed to public (internal Docker network only)
+
+### 7. Write `v3/docker-compose.yml`
+
+Services (in dependency order):
+
+| Service | Image / Build | Ports (host) | Notes |
+|---------|--------------|--------------|-------|
+| `minio` | `minio/minio:latest` | none (internal only) | Remove public port exposure; Caddy proxies `/s3/*` |
+| `minio-init` | `minio/mc:latest` | — | Same as v2 |
+| `pocketbase` | `ghcr.io/muchobien/pocketbase:latest` | none (internal only) | Remove public port |
+| `pb-init` | `alpine:3.19` | — | Same as v2, uses `v3/scripts/pb-init-v3.sh` |
+| `valkey` | `valkey/valkey:8-alpine` | none (internal) | `valkey-server --save "" --appendonly no` |
+| `meilisearch` | `getmeili/meilisearch:v1.7` | none (internal) | `MEILI_NO_ANALYTICS=true`, persistent volume |
+| `backend` | build `v3/backend` target `backend` | none (internal) | Add `VALKEY_ADDR`, `MEILI_URL`, `MEILI_API_KEY` |
+| `runner` | build `v3/backend` target `runner` | `9091` (metrics) | Add `RUNNER_METRICS_ADDR`, `MEILI_URL`, `MEILI_API_KEY`; healthcheck via `/metrics` |
+| `ui` | build `v3/ui` | none (internal) | Add `VALKEY_URL`; remove `PUBLIC_MINIO_PUBLIC_URL` (all through Caddy now) |
+| `caddy` | `caddy:2-alpine` | `80`, `443` | Bind-mount `v3/Caddyfile`; persistent `caddy_data` volume for certs |
+
+Volumes: `minio_data`, `pb_data`, `meili_data`, `caddy_data`
+
+- [ ] Write the full file with healthchecks, depends_on, env vars
+
+### 8. Write `v3/scripts/pb-init-v3.sh`
+
+- [ ] Start from `scripts/pb-init-v2.sh`
+- [ ] Assess if any schema changes needed (Meilisearch sync does not require new PB collections
+  — search is entirely Meilisearch-side)
+- [ ] If identical to v2 script, note that in a comment at the top; keep as separate file
+
+---
+
+## Environment variables (new in v3)
+
+| Variable | Service | Default | Description |
+|----------|---------|---------|-------------|
+| `VALKEY_ADDR` | backend | `valkey:6379` | Valkey TCP address |
+| `VALKEY_URL` | ui | `redis://valkey:6379` | Valkey URL (ioredis format) |
+| `MEILI_URL` | backend, runner | `http://meilisearch:7700` | Meilisearch HTTP URL |
+| `MEILI_API_KEY` | backend, runner | `""` | Meilisearch master key (empty = no auth for dev) |
+| `RUNNER_METRICS_ADDR` | runner | `:9091` | Runner metrics HTTP listen address |
+| `DOMAIN` | caddy | `localhost` | Public domain for HTTPS cert |
+| `CADDY_ACME_EMAIL` | caddy | `""` | Let's Encrypt notification email |
+
+---
+
+## Testing checklist (before considering v3 stable)
+
+- [ ] `docker compose -f v3/docker-compose.yml up --build` starts cleanly
+- [ ] `curl https://{DOMAIN}/health` returns 200 (Caddy → backend)
+- [ ] Book search returns results from Meilisearch after at least one scrape
+- [ ] Presign URL cache hit visible in backend logs (Valkey `GET` hit)
+- [ ] `curl http://localhost:9091/metrics` returns JSON with counters
+- [ ] Runner healthcheck passes via `/metrics` endpoint (not file-based)
+- [ ] MinIO console NOT reachable from the internet (no public port)
+- [ ] PocketBase NOT reachable from the internet (no public port)
+- [ ] TLS cert obtained from Let's Encrypt (check `caddy_data` volume / Caddy logs)

v3/backend/.dockerignore

@@ -0,0 +1,13 @@
+# Exclude compiled binaries
+bin/
+
+# Exclude test binaries produced by `go test -c`
+*.test
+
+# Git history is not needed inside the image
+.git/
+
+# Editor/OS noise
+.DS_Store
+*.swp
+*.swo

v3/backend/Dockerfile

@@ -0,0 +1,42 @@
+# syntax=docker/dockerfile:1
+FROM golang:1.26.1-alpine AS builder
+WORKDIR /app
+
+# Download modules into the BuildKit cache so they survive across builds.
+# This layer is only invalidated when go.mod or go.sum changes.
+COPY go.mod go.sum ./
+RUN --mount=type=cache,target=/root/go/pkg/mod \
+    go mod download
+
+COPY . .
+
+ARG VERSION=dev
+ARG COMMIT=unknown
+
+# Build all three binaries in a single layer so the Go compiler can reuse
+# intermediate object files.  Both cache mounts are preserved between builds:
+#   /root/go/pkg/mod   — downloaded module source
+#   /root/.cache/go-build — compiled package objects (incremental recompile)
+RUN --mount=type=cache,target=/root/go/pkg/mod \
+    --mount=type=cache,target=/root/.cache/go-build \
+    CGO_ENABLED=0 GOOS=linux go build \
+      -ldflags="-s -w -X main.version=${VERSION} -X main.commit=${COMMIT}" \
+      -o /out/backend ./cmd/backend && \
+    CGO_ENABLED=0 GOOS=linux go build \
+      -ldflags="-s -w -X main.version=${VERSION} -X main.commit=${COMMIT}" \
+      -o /out/runner ./cmd/runner && \
+    CGO_ENABLED=0 GOOS=linux go build \
+      -ldflags="-s -w" \
+      -o /out/healthcheck ./cmd/healthcheck
+
+# ── backend service ──────────────────────────────────────────────────────────
+FROM gcr.io/distroless/static:nonroot AS backend
+COPY --from=builder /out/healthcheck /healthcheck
+COPY --from=builder /out/backend /backend
+ENTRYPOINT ["/backend"]
+
+# ── runner service ───────────────────────────────────────────────────────────
+FROM gcr.io/distroless/static:nonroot AS runner
+COPY --from=builder /out/healthcheck /healthcheck
+COPY --from=builder /out/runner /runner
+ENTRYPOINT ["/runner"]

v3/backend/cmd/backend/main.go

@@ -0,0 +1,139 @@
+// Command backend is the LibNovel HTTP API server.
+//
+// It exposes all endpoints consumed by the SvelteKit UI: book/chapter reads,
+// scrape-task creation, presigned MinIO URLs, audio-task creation, reading
+// progress, live novelfire.net browse/search, and Kokoro voice list.
+//
+// All heavy lifting (scraping, TTS generation) is delegated to the runner
+// binary via PocketBase task records. The backend never scrapes directly.
+//
+// Usage:
+//
+//	backend          # start HTTP server (blocks until SIGINT/SIGTERM)
+package main
+
+import (
+	"context"
+	"fmt"
+	"log/slog"
+	"os"
+	"os/signal"
+	"syscall"
+
+	"github.com/libnovel/backend/internal/backend"
+	"github.com/libnovel/backend/internal/config"
+	"github.com/libnovel/backend/internal/kokoro"
+	"github.com/libnovel/backend/internal/meili"
+	"github.com/libnovel/backend/internal/storage"
+)
+
+// version and commit are set at build time via -ldflags.
+var (
+	version = "dev"
+	commit  = "unknown"
+)
+
+func main() {
+	if err := run(); err != nil {
+		fmt.Fprintf(os.Stderr, "backend: fatal: %v\n", err)
+		os.Exit(1)
+	}
+}
+
+func run() error {
+	cfg := config.Load()
+
+	// ── Logger ───────────────────────────────────────────────────────────────
+	log := buildLogger(cfg.LogLevel)
+	log.Info("backend starting",
+		"version", version,
+		"commit", commit,
+		"addr", cfg.HTTP.Addr,
+	)
+
+	// ── Context: cancel on SIGINT / SIGTERM ──────────────────────────────────
+	ctx, stop := signal.NotifyContext(context.Background(), os.Interrupt, syscall.SIGTERM)
+	defer stop()
+
+	// ── Storage ──────────────────────────────────────────────────────────────
+	store, err := storage.NewStore(ctx, cfg, log)
+	if err != nil {
+		return fmt.Errorf("init storage: %w", err)
+	}
+
+	// ── Kokoro (voice list only; audio generation is done by the runner) ─────
+	var kokoroClient kokoro.Client
+	if cfg.Kokoro.URL != "" {
+		kokoroClient = kokoro.New(cfg.Kokoro.URL)
+		log.Info("kokoro voices enabled", "url", cfg.Kokoro.URL)
+	} else {
+		log.Info("KOKORO_URL not set — voice list will use built-in fallback")
+		kokoroClient = &noopKokoro{}
+	}
+
+	// ── Meilisearch (search reads only; indexing is the runner's job) ────────
+	var searchIndex meili.Client
+	if cfg.Meilisearch.URL != "" {
+		searchIndex = meili.New(cfg.Meilisearch.URL, cfg.Meilisearch.APIKey)
+		log.Info("meilisearch search enabled", "url", cfg.Meilisearch.URL)
+	} else {
+		log.Info("MEILI_URL not set — search will use PocketBase substring fallback")
+		searchIndex = meili.NoopClient{}
+	}
+
+	// ── Backend server ───────────────────────────────────────────────────────
+	srv := backend.New(
+		backend.Config{
+			Addr:         cfg.HTTP.Addr,
+			DefaultVoice: cfg.Kokoro.DefaultVoice,
+			Version:      version,
+			Commit:       commit,
+		},
+		backend.Dependencies{
+			BookReader:    store,
+			RankingStore:  store,
+			AudioStore:    store,
+			PresignStore:  store,
+			ProgressStore: store,
+			BrowseStore:   store,
+			CoverStore:    store,
+			Producer:      store,
+			TaskReader:    store,
+			SearchIndex:   searchIndex,
+			Kokoro:        kokoroClient,
+			Log:           log,
+		},
+	)
+
+	return srv.ListenAndServe(ctx)
+}
+
+// ── Helpers ───────────────────────────────────────────────────────────────────
+
+func buildLogger(level string) *slog.Logger {
+	var lvl slog.Level
+	switch level {
+	case "debug":
+		lvl = slog.LevelDebug
+	case "warn":
+		lvl = slog.LevelWarn
+	case "error":
+		lvl = slog.LevelError
+	default:
+		lvl = slog.LevelInfo
+	}
+	return slog.New(slog.NewJSONHandler(os.Stdout, &slog.HandlerOptions{Level: lvl}))
+}
+
+// noopKokoro is a no-op implementation used when KOKORO_URL is not set.
+// The backend only uses Kokoro for the voice list; audio generation is the
+// runner's responsibility. With no URL the built-in fallback list is served.
+type noopKokoro struct{}
+
+func (n *noopKokoro) GenerateAudio(_ context.Context, _, _ string) ([]byte, error) {
+	return nil, fmt.Errorf("kokoro not configured (KOKORO_URL is empty)")
+}
+
+func (n *noopKokoro) ListVoices(_ context.Context) ([]string, error) {
+	return nil, nil
+}

v3/backend/cmd/backend/main_test.go

@@ -0,0 +1,57 @@
+package main
+
+import (
+	"os"
+	"testing"
+)
+
+// TestBuildLogger verifies that buildLogger returns a non-nil logger for each
+// supported log level string and for unknown values.
+func TestBuildLogger(t *testing.T) {
+	for _, level := range []string{"debug", "info", "warn", "error", "unknown", ""} {
+		l := buildLogger(level)
+		if l == nil {
+			t.Errorf("buildLogger(%q) returned nil", level)
+		}
+	}
+}
+
+// TestNoopKokoro verifies that the no-op Kokoro stub returns the expected
+// sentinel error from GenerateAudio and nil, nil from ListVoices.
+func TestNoopKokoro(t *testing.T) {
+	noop := &noopKokoro{}
+
+	_, err := noop.GenerateAudio(t.Context(), "text", "af_bella")
+	if err == nil {
+		t.Fatal("noopKokoro.GenerateAudio: expected error, got nil")
+	}
+
+	voices, err := noop.ListVoices(t.Context())
+	if err != nil {
+		t.Fatalf("noopKokoro.ListVoices: unexpected error: %v", err)
+	}
+	if voices != nil {
+		t.Fatalf("noopKokoro.ListVoices: expected nil slice, got %v", voices)
+	}
+}
+
+// TestRunStorageUnreachable verifies that run() fails fast and returns a
+// descriptive error when PocketBase is unreachable.
+func TestRunStorageUnreachable(t *testing.T) {
+	// Point at an address nothing is listening on.
+	t.Setenv("POCKETBASE_URL", "http://127.0.0.1:19999")
+	// Use a fast listen address so we don't accidentally start a real server.
+	t.Setenv("BACKEND_HTTP_ADDR", "127.0.0.1:0")
+
+	err := run()
+	if err == nil {
+		t.Fatal("run() should have returned an error when storage is unreachable")
+	}
+
+	t.Logf("got expected error: %v", err)
+}
+
+// TestMain runs the test suite. No special setup required.
+func TestMain(m *testing.M) {
+	os.Exit(m.Run())
+}

v3/backend/cmd/healthcheck/main.go

@@ -0,0 +1,89 @@
+// healthcheck is a static binary used by Docker HEALTHCHECK CMD in distroless
+// images (which have no shell, wget, or curl).
+//
+// Two modes:
+//
+//  1. HTTP mode (default):
+//     /healthcheck <url>
+//     Performs GET <url>; exits 0 if HTTP 2xx/3xx, 1 otherwise.
+//     Example: /healthcheck http://localhost:8080/health
+//
+//  2. File-liveness mode:
+//     /healthcheck file <path> <max_age_seconds>
+//     Reads <path>, parses its content as RFC3339 timestamp, and exits 1 if the
+//     timestamp is older than <max_age_seconds>. Used by the runner service which
+//     writes /tmp/runner.alive on every successful poll.
+//     Example: /healthcheck file /tmp/runner.alive 120
+package main
+
+import (
+	"fmt"
+	"net/http"
+	"os"
+	"strconv"
+	"time"
+)
+
+func main() {
+	if len(os.Args) > 1 && os.Args[1] == "file" {
+		checkFile()
+		return
+	}
+	checkHTTP()
+}
+
+// checkHTTP performs a GET request and exits 0 on success, 1 on failure.
+func checkHTTP() {
+	url := "http://localhost:8080/health"
+	if len(os.Args) > 1 {
+		url = os.Args[1]
+	}
+	resp, err := http.Get(url) //nolint:gosec,noctx
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "healthcheck: %v\n", err)
+		os.Exit(1)
+	}
+	resp.Body.Close()
+	if resp.StatusCode >= 400 {
+		fmt.Fprintf(os.Stderr, "healthcheck: status %d\n", resp.StatusCode)
+		os.Exit(1)
+	}
+}
+
+// checkFile reads a timestamp from a file and exits 1 if it is older than the
+// given max age. Usage: /healthcheck file <path> <max_age_seconds>
+func checkFile() {
+	if len(os.Args) < 4 {
+		fmt.Fprintln(os.Stderr, "healthcheck file: usage: /healthcheck file <path> <max_age_seconds>")
+		os.Exit(1)
+	}
+	path := os.Args[2]
+	maxAgeSec, err := strconv.ParseInt(os.Args[3], 10, 64)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "healthcheck file: invalid max_age_seconds %q: %v\n", os.Args[3], err)
+		os.Exit(1)
+	}
+
+	data, err := os.ReadFile(path)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "healthcheck file: cannot read %s: %v\n", path, err)
+		os.Exit(1)
+	}
+
+	ts, err := time.Parse(time.RFC3339, string(data))
+	if err != nil {
+		// Fallback: use file mtime if content is not a valid timestamp.
+		info, statErr := os.Stat(path)
+		if statErr != nil {
+			fmt.Fprintf(os.Stderr, "healthcheck file: cannot stat %s: %v\n", path, statErr)
+			os.Exit(1)
+		}
+		ts = info.ModTime()
+	}
+
+	age := time.Since(ts)
+	if age > time.Duration(maxAgeSec)*time.Second {
+		fmt.Fprintf(os.Stderr, "healthcheck file: %s is %.0fs old (max %ds)\n", path, age.Seconds(), maxAgeSec)
+		os.Exit(1)
+	}
+}

v3/backend/cmd/runner/main.go

@@ -0,0 +1,159 @@
+// Command runner is the homelab worker binary.
+//
+// It polls PocketBase for pending scrape and audio tasks, executes them, and
+// writes results back. It connects directly to PocketBase and MinIO using
+// admin credentials loaded from environment variables.
+//
+// Usage:
+//
+//	runner          # start polling loop (blocks until SIGINT/SIGTERM)
+package main
+
+import (
+	"context"
+	"fmt"
+	"log/slog"
+	"os"
+	"os/signal"
+	"runtime"
+	"syscall"
+	"time"
+
+	"github.com/libnovel/backend/internal/browser"
+	"github.com/libnovel/backend/internal/config"
+	"github.com/libnovel/backend/internal/kokoro"
+	"github.com/libnovel/backend/internal/meili"
+	"github.com/libnovel/backend/internal/novelfire"
+	"github.com/libnovel/backend/internal/runner"
+	"github.com/libnovel/backend/internal/storage"
+)
+
+// version and commit are set at build time via -ldflags.
+var (
+	version = "dev"
+	commit  = "unknown"
+)
+
+func main() {
+	if err := run(); err != nil {
+		fmt.Fprintf(os.Stderr, "runner: fatal: %v\n", err)
+		os.Exit(1)
+	}
+}
+
+func run() error {
+	cfg := config.Load()
+
+	// ── Logger ──────────────────────────────────────────────────────────────
+	log := buildLogger(cfg.LogLevel)
+	log.Info("runner starting",
+		"version", version,
+		"commit", commit,
+		"worker_id", cfg.Runner.WorkerID,
+	)
+
+	// ── Context: cancel on SIGINT / SIGTERM ─────────────────────────────────
+	ctx, stop := signal.NotifyContext(context.Background(), os.Interrupt, syscall.SIGTERM)
+	defer stop()
+
+	// ── Storage ─────────────────────────────────────────────────────────────
+	store, err := storage.NewStore(ctx, cfg, log)
+	if err != nil {
+		return fmt.Errorf("init storage: %w", err)
+	}
+
+	// ── Browser / Scraper ───────────────────────────────────────────────────
+	workers := cfg.Runner.Workers
+	if workers <= 0 {
+		workers = runtime.NumCPU()
+	}
+	timeout := cfg.Runner.Timeout
+	if timeout <= 0 {
+		timeout = 90 * time.Second
+	}
+
+	browserClient := browser.NewDirectClient(browser.Config{
+		MaxConcurrent: workers,
+		Timeout:       timeout,
+	})
+	novel := novelfire.New(browserClient, log)
+
+	// ── Kokoro ──────────────────────────────────────────────────────────────
+	var kokoroClient kokoro.Client
+	if cfg.Kokoro.URL != "" {
+		kokoroClient = kokoro.New(cfg.Kokoro.URL)
+		log.Info("kokoro TTS enabled", "url", cfg.Kokoro.URL)
+	} else {
+		log.Warn("KOKORO_URL not set — audio tasks will fail")
+		kokoroClient = &noopKokoro{}
+	}
+
+	// ── Meilisearch ─────────────────────────────────────────────────────────
+	var searchIndex meili.Client
+	if cfg.Meilisearch.URL != "" {
+		if err := meili.Configure(cfg.Meilisearch.URL, cfg.Meilisearch.APIKey); err != nil {
+			log.Warn("meilisearch configure failed — search indexing disabled", "err", err)
+			searchIndex = meili.NoopClient{}
+		} else {
+			searchIndex = meili.New(cfg.Meilisearch.URL, cfg.Meilisearch.APIKey)
+			log.Info("meilisearch enabled", "url", cfg.Meilisearch.URL)
+		}
+	} else {
+		log.Info("MEILI_URL not set — search indexing disabled")
+		searchIndex = meili.NoopClient{}
+	}
+
+	// ── Runner ──────────────────────────────────────────────────────────────
+	rCfg := runner.Config{
+		WorkerID:                 cfg.Runner.WorkerID,
+		PollInterval:             cfg.Runner.PollInterval,
+		MaxConcurrentScrape:      cfg.Runner.MaxConcurrentScrape,
+		MaxConcurrentAudio:       cfg.Runner.MaxConcurrentAudio,
+		OrchestratorWorkers:      workers,
+		MetricsAddr:              cfg.Runner.MetricsAddr,
+		CatalogueRefreshInterval: cfg.Runner.CatalogueRefreshInterval,
+	}
+	deps := runner.Dependencies{
+		Consumer:    store,
+		BookWriter:  store,
+		BookReader:  store,
+		AudioStore:  store,
+		BrowseStore: store,
+		CoverStore:  store,
+		SearchIndex: searchIndex,
+		Novel:       novel,
+		Kokoro:      kokoroClient,
+		Log:         log,
+	}
+	r := runner.New(rCfg, deps)
+
+	return r.Run(ctx)
+}
+
+// ── Helpers ───────────────────────────────────────────────────────────────────
+
+func buildLogger(level string) *slog.Logger {
+	var lvl slog.Level
+	switch level {
+	case "debug":
+		lvl = slog.LevelDebug
+	case "warn":
+		lvl = slog.LevelWarn
+	case "error":
+		lvl = slog.LevelError
+	default:
+		lvl = slog.LevelInfo
+	}
+	return slog.New(slog.NewJSONHandler(os.Stdout, &slog.HandlerOptions{Level: lvl}))
+}
+
+// noopKokoro is a no-op implementation used when KOKORO_URL is not set.
+type noopKokoro struct{}
+
+func (n *noopKokoro) GenerateAudio(_ context.Context, _, _ string) ([]byte, error) {
+	return nil, fmt.Errorf("kokoro not configured (KOKORO_URL is empty)")
+}
+
+func (n *noopKokoro) ListVoices(_ context.Context) ([]string, error) {
+	return nil, nil
+}

v3/backend/go.mod

@@ -0,0 +1,36 @@
+module github.com/libnovel/backend
+
+go 1.26.1
+
+require (
+	github.com/minio/minio-go/v7 v7.0.98
+	golang.org/x/net v0.51.0
+)
+
+require (
+	github.com/andybalholm/brotli v1.1.1 // indirect
+	github.com/cespare/xxhash/v2 v2.3.0 // indirect
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f // indirect
+	github.com/dustin/go-humanize v1.0.1 // indirect
+	github.com/go-ini/ini v1.67.0 // indirect
+	github.com/golang-jwt/jwt/v5 v5.3.1 // indirect
+	github.com/google/uuid v1.6.0 // indirect
+	github.com/klauspost/compress v1.18.2 // indirect
+	github.com/klauspost/cpuid/v2 v2.2.11 // indirect
+	github.com/klauspost/crc32 v1.3.0 // indirect
+	github.com/meilisearch/meilisearch-go v0.36.1 // indirect
+	github.com/minio/crc64nvme v1.1.1 // indirect
+	github.com/minio/md5-simd v1.1.2 // indirect
+	github.com/philhofer/fwd v1.2.0 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	github.com/redis/go-redis/v9 v9.18.0 // indirect
+	github.com/rs/xid v1.6.0 // indirect
+	github.com/tinylib/msgp v1.6.1 // indirect
+	go.uber.org/atomic v1.11.0 // indirect
+	go.yaml.in/yaml/v3 v3.0.4 // indirect
+	golang.org/x/crypto v0.48.0 // indirect
+	golang.org/x/sys v0.41.0 // indirect
+	golang.org/x/text v0.34.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+)

v3/backend/go.sum

@@ -0,0 +1,61 @@
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v3/backend/internal/backend/server.go

@@ -0,0 +1,300 @@
+// Package backend implements the HTTP API server for the LibNovel backend.
+//
+// The server exposes all endpoints consumed by the SvelteKit UI:
+//   - Book/chapter reads from PocketBase/MinIO via bookstore interfaces
+//   - Task creation (scrape + audio) via taskqueue.Producer — the runner binary
+//     picks up and executes those tasks asynchronously
+//   - Presigned MinIO URLs for media playback/upload
+//   - Session-scoped reading progress
+//   - Live novelfire.net browse/search (no scraper interface needed; direct HTTP)
+//   - Kokoro voice list
+//
+// The backend never scrapes directly. All scraping (metadata, chapter list,
+// chapter text, audio TTS) is delegated to the runner binary via PocketBase
+// task records. GET /api/book-preview enqueues a task when the book is absent.
+//
+// All external dependencies are injected as interfaces; concrete types live in
+// internal/storage and are wired by cmd/backend/main.go.
+package backend
+
+import (
+	"context"
+	"crypto/rand"
+	"encoding/hex"
+	"encoding/json"
+	"fmt"
+	"log/slog"
+	"net/http"
+	"sync"
+	"time"
+
+	"github.com/libnovel/backend/internal/bookstore"
+	"github.com/libnovel/backend/internal/kokoro"
+	"github.com/libnovel/backend/internal/meili"
+	"github.com/libnovel/backend/internal/taskqueue"
+)
+
+// Dependencies holds all external services the backend server depends on.
+// Every field is an interface so test doubles can be injected freely.
+type Dependencies struct {
+	// BookReader reads book metadata and chapter text from PocketBase/MinIO.
+	BookReader bookstore.BookReader
+	// RankingStore reads ranking data from PocketBase.
+	RankingStore bookstore.RankingStore
+	// AudioStore checks audio object existence and computes MinIO keys.
+	AudioStore bookstore.AudioStore
+	// PresignStore generates short-lived MinIO URLs.
+	PresignStore bookstore.PresignStore
+	// ProgressStore reads/writes per-session reading progress.
+	ProgressStore bookstore.ProgressStore
+	// BrowseStore reads cached browse page snapshots from MinIO.
+	BrowseStore bookstore.BrowseStore
+	// CoverStore reads and writes book cover images from MinIO.
+	// If nil, the cover endpoint falls back to a CDN redirect.
+	CoverStore bookstore.CoverStore
+	// Producer creates scrape/audio tasks in PocketBase.
+	Producer taskqueue.Producer
+	// TaskReader reads scrape/audio task records from PocketBase.
+	TaskReader taskqueue.Reader
+	// SearchIndex provides full-text book search via Meilisearch.
+	// If nil, the local-only fallback search is used.
+	SearchIndex meili.Client
+	// Kokoro is the TTS client (used for voice list only in the backend;
+	// audio generation is done by the runner).
+	Kokoro kokoro.Client
+	// Log is the structured logger.
+	Log *slog.Logger
+}
+
+// Config holds HTTP server tuning parameters.
+type Config struct {
+	// Addr is the listen address, e.g. ":8080".
+	Addr string
+	// DefaultVoice is used when no voice is specified in audio requests.
+	DefaultVoice string
+	// Version and Commit are embedded in /health and /api/version responses.
+	Version string
+	Commit  string
+}
+
+// Server is the HTTP API server.
+type Server struct {
+	cfg  Config
+	deps Dependencies
+
+	// voiceMu guards cachedVoices. Populated lazily on first GET /api/voices.
+	voiceMu      sync.RWMutex
+	cachedVoices []string
+}
+
+// New creates a Server from cfg and deps.
+func New(cfg Config, deps Dependencies) *Server {
+	if cfg.DefaultVoice == "" {
+		cfg.DefaultVoice = "af_bella"
+	}
+	if deps.Log == nil {
+		deps.Log = slog.Default()
+	}
+	if deps.SearchIndex == nil {
+		deps.SearchIndex = meili.NoopClient{}
+	}
+	return &Server{cfg: cfg, deps: deps}
+}
+
+// ListenAndServe registers all routes and starts the HTTP server.
+// It blocks until ctx is cancelled, then performs a graceful shutdown.
+func (s *Server) ListenAndServe(ctx context.Context) error {
+	mux := http.NewServeMux()
+
+	// Health / version
+	mux.HandleFunc("GET /health", s.handleHealth)
+	mux.HandleFunc("GET /api/version", s.handleVersion)
+
+	// Scrape task creation (202 Accepted — runner executes asynchronously)
+	mux.HandleFunc("POST /scrape", s.handleScrapeCatalogue)
+	mux.HandleFunc("POST /scrape/book", s.handleScrapeBook)
+	mux.HandleFunc("POST /scrape/book/range", s.handleScrapeBookRange)
+
+	// Scrape task status / history
+	mux.HandleFunc("GET /api/scrape/status", s.handleScrapeStatus)
+	mux.HandleFunc("GET /api/scrape/tasks", s.handleScrapeTasks)
+
+	// Cancel a pending task (scrape or audio)
+	mux.HandleFunc("POST /api/cancel-task/{id}", s.handleCancelTask)
+
+	// Browse & search (live novelfire.net)
+	mux.HandleFunc("GET /api/browse", s.handleBrowse)
+	mux.HandleFunc("GET /api/search", s.handleSearch)
+
+	// Catalogue (Meilisearch-backed browse + search — preferred path for UI)
+	mux.HandleFunc("GET /api/catalogue", s.handleCatalogue)
+
+	// Ranking (from PocketBase)
+	mux.HandleFunc("GET /api/ranking", s.handleGetRanking)
+
+	// Cover proxy (live URL redirect)
+	mux.HandleFunc("GET /api/cover/{domain}/{slug}", s.handleGetCover)
+
+	// Book preview (enqueues scrape task if not in library; returns stored data if already scraped)
+	mux.HandleFunc("GET /api/book-preview/{slug}", s.handleBookPreview)
+
+	// Chapter text (served from MinIO via PocketBase index)
+	mux.HandleFunc("GET /api/chapter-text/{slug}/{n}", s.handleChapterText)
+	// Raw markdown chapter content — served directly from MinIO by the backend.
+	// Use this instead of presign+fetch to avoid SvelteKit→MinIO network path.
+	mux.HandleFunc("GET /api/chapter-markdown/{slug}/{n}", s.handleChapterMarkdown)
+
+	// Reindex chapters_idx from MinIO
+	mux.HandleFunc("POST /api/reindex/{slug}", s.handleReindex)
+
+	// Audio task creation (backend creates task; runner executes)
+	mux.HandleFunc("POST /api/audio/{slug}/{n}", s.handleAudioGenerate)
+	mux.HandleFunc("GET /api/audio/status/{slug}/{n}", s.handleAudioStatus)
+	mux.HandleFunc("GET /api/audio-proxy/{slug}/{n}", s.handleAudioProxy)
+
+	// Voices list
+	mux.HandleFunc("GET /api/voices", s.handleVoices)
+
+	// Presigned URLs
+	mux.HandleFunc("GET /api/presign/chapter/{slug}/{n}", s.handlePresignChapter)
+	mux.HandleFunc("GET /api/presign/audio/{slug}/{n}", s.handlePresignAudio)
+	mux.HandleFunc("GET /api/presign/voice-sample/{voice}", s.handlePresignVoiceSample)
+	mux.HandleFunc("GET /api/presign/avatar-upload/{userId}", s.handlePresignAvatarUpload)
+	mux.HandleFunc("GET /api/presign/avatar/{userId}", s.handlePresignAvatar)
+
+	// Reading progress
+	mux.HandleFunc("GET /api/progress", s.handleGetProgress)
+	mux.HandleFunc("POST /api/progress/{slug}", s.handleSetProgress)
+	mux.HandleFunc("DELETE /api/progress/{slug}", s.handleDeleteProgress)
+
+	srv := &http.Server{
+		Addr:         s.cfg.Addr,
+		Handler:      mux,
+		ReadTimeout:  15 * time.Second,
+		WriteTimeout: 60 * time.Second,
+		IdleTimeout:  60 * time.Second,
+	}
+
+	errCh := make(chan error, 1)
+	go func() { errCh <- srv.ListenAndServe() }()
+	s.deps.Log.Info("backend: HTTP server listening", "addr", s.cfg.Addr)
+
+	select {
+	case <-ctx.Done():
+		s.deps.Log.Info("backend: context cancelled, starting graceful shutdown")
+		shutCtx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
+		defer cancel()
+		if err := srv.Shutdown(shutCtx); err != nil {
+			s.deps.Log.Error("backend: graceful shutdown failed", "err", err)
+			return err
+		}
+		s.deps.Log.Info("backend: shutdown complete")
+		return nil
+	case err := <-errCh:
+		return err
+	}
+}
+
+// ── Session cookie helpers ─────────────────────────────────────────────────────
+
+const sessionCookieName = "libnovel_session"
+
+func sessionID(r *http.Request) string {
+	c, err := r.Cookie(sessionCookieName)
+	if err != nil {
+		return ""
+	}
+	return c.Value
+}
+
+func newSessionID() (string, error) {
+	b := make([]byte, 16)
+	if _, err := rand.Read(b); err != nil {
+		return "", err
+	}
+	return hex.EncodeToString(b), nil
+}
+
+func ensureSession(w http.ResponseWriter, r *http.Request) string {
+	if id := sessionID(r); id != "" {
+		return id
+	}
+	id, err := newSessionID()
+	if err != nil {
+		id = fmt.Sprintf("fallback-%d", time.Now().UnixNano())
+	}
+	http.SetCookie(w, &http.Cookie{
+		Name:     sessionCookieName,
+		Value:    id,
+		Path:     "/",
+		HttpOnly: true,
+		SameSite: http.SameSiteLaxMode,
+		MaxAge:   365 * 24 * 60 * 60,
+	})
+	return id
+}
+
+// ── Utility helpers ────────────────────────────────────────────────────────────
+
+// writeJSON writes v as a JSON response with status code. Status 0 → 200.
+func writeJSON(w http.ResponseWriter, status int, v any) {
+	w.Header().Set("Content-Type", "application/json")
+	if status != 0 {
+		w.WriteHeader(status)
+	}
+	_ = json.NewEncoder(w).Encode(v)
+}
+
+// jsonError writes a JSON error body and the given status code.
+func jsonError(w http.ResponseWriter, status int, msg string) {
+	w.Header().Set("Content-Type", "application/json")
+	w.WriteHeader(status)
+	_ = json.NewEncoder(w).Encode(map[string]string{"error": msg})
+}
+
+// voices returns the list of available Kokoro voices. On the first call it
+// fetches from the Kokoro service and caches the result. Falls back to the
+// hardcoded list on error.
+func (s *Server) voices(ctx context.Context) []string {
+	s.voiceMu.RLock()
+	cached := s.cachedVoices
+	s.voiceMu.RUnlock()
+	if len(cached) > 0 {
+		return cached
+	}
+
+	if s.deps.Kokoro == nil {
+		return kokoroVoices
+	}
+
+	fetchCtx, cancel := context.WithTimeout(ctx, 5*time.Second)
+	defer cancel()
+	list, err := s.deps.Kokoro.ListVoices(fetchCtx)
+	if err != nil || len(list) == 0 {
+		s.deps.Log.Warn("backend: could not fetch kokoro voices, using built-in list", "err", err)
+		return kokoroVoices
+	}
+
+	s.voiceMu.Lock()
+	s.cachedVoices = list
+	s.voiceMu.Unlock()
+	s.deps.Log.Info("backend: fetched kokoro voices", "count", len(list))
+	return list
+}
+
+// handleHealth handles GET /health.
+func (s *Server) handleHealth(w http.ResponseWriter, _ *http.Request) {
+	writeJSON(w, 0, map[string]string{
+		"status":  "ok",
+		"version": s.cfg.Version,
+		"commit":  s.cfg.Commit,
+	})
+}
+
+// handleVersion handles GET /api/version.
+func (s *Server) handleVersion(w http.ResponseWriter, _ *http.Request) {
+	writeJSON(w, 0, map[string]string{
+		"version": s.cfg.Version,
+		"commit":  s.cfg.Commit,
+	})
+}

v3/backend/internal/bookstore/bookstore.go

@@ -0,0 +1,151 @@
+// Package bookstore defines the segregated read/write interfaces for book,
+// chapter, ranking, progress, audio, and presign data.
+//
+// Interface segregation:
+//   - BookWriter   — used by the runner to persist scraped data.
+//   - BookReader   — used by the backend to serve book/chapter data.
+//   - RankingStore — used by both runner (write) and backend (read).
+//   - PresignStore — used only by the backend for URL signing.
+//   - AudioStore   — used by the runner to store audio; backend for presign.
+//   - ProgressStore— used only by the backend for reading progress.
+//
+// Concrete implementations live in internal/storage.
+package bookstore
+
+import (
+	"context"
+	"time"
+
+	"github.com/libnovel/backend/internal/domain"
+)
+
+// BookWriter is the write side used by the runner after scraping a book.
+type BookWriter interface {
+	// WriteMetadata upserts all bibliographic fields for a book.
+	WriteMetadata(ctx context.Context, meta domain.BookMeta) error
+
+	// WriteChapter stores a fully-scraped chapter's text in MinIO and
+	// updates the chapters_idx record in PocketBase.
+	WriteChapter(ctx context.Context, slug string, chapter domain.Chapter) error
+
+	// WriteChapterRefs persists chapter metadata (number + title) into
+	// chapters_idx without fetching or storing chapter text.
+	WriteChapterRefs(ctx context.Context, slug string, refs []domain.ChapterRef) error
+
+	// ChapterExists returns true if the markdown object for ref already exists.
+	ChapterExists(ctx context.Context, slug string, ref domain.ChapterRef) bool
+}
+
+// BookReader is the read side used by the backend to serve content.
+type BookReader interface {
+	// ReadMetadata returns the metadata for slug.
+	// Returns (zero, false, nil) when not found.
+	ReadMetadata(ctx context.Context, slug string) (domain.BookMeta, bool, error)
+
+	// ListBooks returns all books sorted alphabetically by title.
+	ListBooks(ctx context.Context) ([]domain.BookMeta, error)
+
+	// LocalSlugs returns the set of slugs that have metadata stored.
+	LocalSlugs(ctx context.Context) (map[string]bool, error)
+
+	// MetadataMtime returns the Unix-second mtime of the metadata record, or 0.
+	MetadataMtime(ctx context.Context, slug string) int64
+
+	// ReadChapter returns the raw markdown for chapter number n.
+	ReadChapter(ctx context.Context, slug string, n int) (string, error)
+
+	// ListChapters returns all stored chapters for slug, sorted by number.
+	ListChapters(ctx context.Context, slug string) ([]domain.ChapterInfo, error)
+
+	// CountChapters returns the count of stored chapters.
+	CountChapters(ctx context.Context, slug string) int
+
+	// ReindexChapters rebuilds chapters_idx from MinIO objects for slug.
+	ReindexChapters(ctx context.Context, slug string) (int, error)
+}
+
+// RankingStore covers ranking reads and writes.
+type RankingStore interface {
+	// WriteRankingItem upserts a single ranking entry (keyed on Slug).
+	WriteRankingItem(ctx context.Context, item domain.RankingItem) error
+
+	// ReadRankingItems returns all ranking items sorted by rank ascending.
+	ReadRankingItems(ctx context.Context) ([]domain.RankingItem, error)
+
+	// RankingFreshEnough returns true when ranking rows exist and the most
+	// recent Updated timestamp is within maxAge.
+	RankingFreshEnough(ctx context.Context, maxAge time.Duration) (bool, error)
+}
+
+// AudioStore covers audio object storage (runner writes; backend reads).
+type AudioStore interface {
+	// AudioObjectKey returns the MinIO object key for a cached audio file.
+	AudioObjectKey(slug string, n int, voice string) string
+
+	// AudioExists returns true when the audio object is present in MinIO.
+	AudioExists(ctx context.Context, key string) bool
+
+	// PutAudio stores raw audio bytes under the given MinIO object key.
+	PutAudio(ctx context.Context, key string, data []byte) error
+}
+
+// PresignStore generates short-lived URLs — used exclusively by the backend.
+type PresignStore interface {
+	// PresignChapter returns a presigned GET URL for a chapter markdown object.
+	PresignChapter(ctx context.Context, slug string, n int, expires time.Duration) (string, error)
+
+	// PresignAudio returns a presigned GET URL for an audio object.
+	PresignAudio(ctx context.Context, key string, expires time.Duration) (string, error)
+
+	// PresignAvatarUpload returns a short-lived presigned PUT URL for uploading
+	// an avatar image. ext should be "jpg", "png", or "webp".
+	PresignAvatarUpload(ctx context.Context, userID, ext string) (uploadURL, key string, err error)
+
+	// PresignAvatarURL returns a presigned GET URL for a user's avatar.
+	// Returns ("", false, nil) when no avatar exists.
+	PresignAvatarURL(ctx context.Context, userID string) (string, bool, error)
+
+	// DeleteAvatar removes all avatar objects for a user.
+	DeleteAvatar(ctx context.Context, userID string) error
+}
+
+// ProgressStore covers per-session reading progress — backend only.
+type ProgressStore interface {
+	// GetProgress returns the reading progress for the given session + slug.
+	GetProgress(ctx context.Context, sessionID, slug string) (domain.ReadingProgress, bool)
+
+	// SetProgress saves or updates reading progress.
+	SetProgress(ctx context.Context, sessionID string, p domain.ReadingProgress) error
+
+	// AllProgress returns all progress entries for a session.
+	AllProgress(ctx context.Context, sessionID string) ([]domain.ReadingProgress, error)
+
+	// DeleteProgress removes progress for a specific slug.
+	DeleteProgress(ctx context.Context, sessionID, slug string) error
+}
+
+// BrowseStore covers browse page snapshot storage.
+// The runner writes snapshots; the backend reads them.
+type BrowseStore interface {
+	// PutBrowsePage stores a raw JSON snapshot for a browse page.
+	// genre, sort, status, novelType and page identify the page.
+	PutBrowsePage(ctx context.Context, genre, sort, status, novelType string, page int, data []byte) error
+
+	// GetBrowsePage retrieves a raw JSON snapshot. Returns (nil, false, nil)
+	// when no snapshot exists for the given parameters.
+	GetBrowsePage(ctx context.Context, genre, sort, status, novelType string, page int) ([]byte, bool, error)
+}
+
+// CoverStore covers book cover image storage in MinIO.
+// The runner writes covers during catalogue refresh; the backend reads them.
+type CoverStore interface {
+	// PutCover stores a raw cover image for a book identified by slug.
+	PutCover(ctx context.Context, slug string, data []byte, contentType string) error
+
+	// GetCover retrieves the cover image for a book. Returns (nil, false, nil)
+	// when no cover exists for the given slug.
+	GetCover(ctx context.Context, slug string) ([]byte, string, bool, error)
+
+	// CoverExists returns true when a cover image is stored for slug.
+	CoverExists(ctx context.Context, slug string) bool
+}

v3/backend/internal/bookstore/bookstore_test.go

@@ -0,0 +1,138 @@
+package bookstore_test
+
+import (
+	"context"
+	"testing"
+	"time"
+
+	"github.com/libnovel/backend/internal/bookstore"
+	"github.com/libnovel/backend/internal/domain"
+)
+
+// ── Mock that satisfies all bookstore interfaces ──────────────────────────────
+
+type mockStore struct{}
+
+// BookWriter
+func (m *mockStore) WriteMetadata(_ context.Context, _ domain.BookMeta) error         { return nil }
+func (m *mockStore) WriteChapter(_ context.Context, _ string, _ domain.Chapter) error { return nil }
+func (m *mockStore) WriteChapterRefs(_ context.Context, _ string, _ []domain.ChapterRef) error {
+	return nil
+}
+func (m *mockStore) ChapterExists(_ context.Context, _ string, _ domain.ChapterRef) bool {
+	return false
+}
+
+// BookReader
+func (m *mockStore) ReadMetadata(_ context.Context, _ string) (domain.BookMeta, bool, error) {
+	return domain.BookMeta{}, false, nil
+}
+func (m *mockStore) ListBooks(_ context.Context) ([]domain.BookMeta, error) { return nil, nil }
+func (m *mockStore) LocalSlugs(_ context.Context) (map[string]bool, error) {
+	return map[string]bool{}, nil
+}
+func (m *mockStore) MetadataMtime(_ context.Context, _ string) int64 { return 0 }
+func (m *mockStore) ReadChapter(_ context.Context, _ string, _ int) (string, error) {
+	return "", nil
+}
+func (m *mockStore) ListChapters(_ context.Context, _ string) ([]domain.ChapterInfo, error) {
+	return nil, nil
+}
+func (m *mockStore) CountChapters(_ context.Context, _ string) int            { return 0 }
+func (m *mockStore) ReindexChapters(_ context.Context, _ string) (int, error) { return 0, nil }
+
+// RankingStore
+func (m *mockStore) WriteRankingItem(_ context.Context, _ domain.RankingItem) error { return nil }
+func (m *mockStore) ReadRankingItems(_ context.Context) ([]domain.RankingItem, error) {
+	return nil, nil
+}
+func (m *mockStore) RankingFreshEnough(_ context.Context, _ time.Duration) (bool, error) {
+	return false, nil
+}
+
+// AudioStore
+func (m *mockStore) AudioObjectKey(_ string, _ int, _ string) string      { return "" }
+func (m *mockStore) AudioExists(_ context.Context, _ string) bool         { return false }
+func (m *mockStore) PutAudio(_ context.Context, _ string, _ []byte) error { return nil }
+
+// PresignStore
+func (m *mockStore) PresignChapter(_ context.Context, _ string, _ int, _ time.Duration) (string, error) {
+	return "", nil
+}
+func (m *mockStore) PresignAudio(_ context.Context, _ string, _ time.Duration) (string, error) {
+	return "", nil
+}
+func (m *mockStore) PresignAvatarUpload(_ context.Context, _, _ string) (string, string, error) {
+	return "", "", nil
+}
+func (m *mockStore) PresignAvatarURL(_ context.Context, _ string) (string, bool, error) {
+	return "", false, nil
+}
+func (m *mockStore) DeleteAvatar(_ context.Context, _ string) error { return nil }
+
+// ProgressStore
+func (m *mockStore) GetProgress(_ context.Context, _, _ string) (domain.ReadingProgress, bool) {
+	return domain.ReadingProgress{}, false
+}
+func (m *mockStore) SetProgress(_ context.Context, _ string, _ domain.ReadingProgress) error {
+	return nil
+}
+func (m *mockStore) AllProgress(_ context.Context, _ string) ([]domain.ReadingProgress, error) {
+	return nil, nil
+}
+func (m *mockStore) DeleteProgress(_ context.Context, _, _ string) error { return nil }
+
+// ── Compile-time interface satisfaction ───────────────────────────────────────
+
+var _ bookstore.BookWriter = (*mockStore)(nil)
+var _ bookstore.BookReader = (*mockStore)(nil)
+var _ bookstore.RankingStore = (*mockStore)(nil)
+var _ bookstore.AudioStore = (*mockStore)(nil)
+var _ bookstore.PresignStore = (*mockStore)(nil)
+var _ bookstore.ProgressStore = (*mockStore)(nil)
+
+// ── Behavioural tests ─────────────────────────────────────────────────────────
+
+func TestBookWriter_WriteMetadata_ReturnsNilError(t *testing.T) {
+	var w bookstore.BookWriter = &mockStore{}
+	if err := w.WriteMetadata(context.Background(), domain.BookMeta{Slug: "test"}); err != nil {
+		t.Errorf("unexpected error: %v", err)
+	}
+}
+
+func TestBookReader_ReadMetadata_NotFound(t *testing.T) {
+	var r bookstore.BookReader = &mockStore{}
+	_, found, err := r.ReadMetadata(context.Background(), "unknown")
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if found {
+		t.Error("expected not found")
+	}
+}
+
+func TestRankingStore_RankingFreshEnough_ReturnsFalse(t *testing.T) {
+	var s bookstore.RankingStore = &mockStore{}
+	fresh, err := s.RankingFreshEnough(context.Background(), time.Hour)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if fresh {
+		t.Error("expected false")
+	}
+}
+
+func TestAudioStore_AudioExists_ReturnsFalse(t *testing.T) {
+	var s bookstore.AudioStore = &mockStore{}
+	if s.AudioExists(context.Background(), "audio/slug/1/af_bella.mp3") {
+		t.Error("expected false")
+	}
+}
+
+func TestProgressStore_GetProgress_NotFound(t *testing.T) {
+	var s bookstore.ProgressStore = &mockStore{}
+	_, found := s.GetProgress(context.Background(), "session-1", "slug")
+	if found {
+		t.Error("expected not found")
+	}
+}

v3/backend/internal/browser/browser.go

@@ -0,0 +1,191 @@
+// Package browser provides a rate-limited HTTP client for web scraping.
+package browser
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"io"
+	"net/http"
+	"strconv"
+	"sync"
+	"time"
+)
+
+// ErrRateLimit is returned by GetContent when the server responds with 429.
+// It carries the suggested retry delay (from Retry-After header, or a default).
+var ErrRateLimit = errors.New("rate limited (429)")
+
+// RateLimitError wraps ErrRateLimit and carries the suggested wait duration.
+type RateLimitError struct {
+	// RetryAfter is how long the caller should wait before retrying.
+	// Derived from the Retry-After response header when present; otherwise a default.
+	RetryAfter time.Duration
+}
+
+func (e *RateLimitError) Error() string {
+	return fmt.Sprintf("rate limited (429): retry after %s", e.RetryAfter)
+}
+
+func (e *RateLimitError) Is(target error) bool { return target == ErrRateLimit }
+
+// defaultRateLimitDelay is used when the server returns 429 with no Retry-After header.
+const defaultRateLimitDelay = 60 * time.Second
+
+// Client is the interface used by scrapers to fetch raw page HTML.
+// Implementations must be safe for concurrent use.
+type Client interface {
+	// GetContent fetches the URL and returns the full response body as a string.
+	// It should respect the provided context for cancellation and timeouts.
+	GetContent(ctx context.Context, pageURL string) (string, error)
+}
+
+// Config holds tunable parameters for the direct HTTP client.
+type Config struct {
+	// MaxConcurrent limits the number of simultaneous in-flight requests.
+	// Defaults to 5 when 0.
+	MaxConcurrent int
+	// Timeout is the per-request deadline. Defaults to 90s when 0.
+	Timeout time.Duration
+}
+
+// DirectClient is a plain net/http-based Client with a concurrency semaphore.
+type DirectClient struct {
+	http      *http.Client
+	semaphore chan struct{}
+}
+
+// NewDirectClient returns a DirectClient configured by cfg.
+func NewDirectClient(cfg Config) *DirectClient {
+	if cfg.MaxConcurrent <= 0 {
+		cfg.MaxConcurrent = 5
+	}
+	if cfg.Timeout <= 0 {
+		cfg.Timeout = 90 * time.Second
+	}
+
+	transport := &http.Transport{
+		MaxIdleConnsPerHost: cfg.MaxConcurrent * 2,
+		DisableCompression:  false,
+	}
+
+	return &DirectClient{
+		http: &http.Client{
+			Transport: transport,
+			Timeout:   cfg.Timeout,
+		},
+		semaphore: make(chan struct{}, cfg.MaxConcurrent),
+	}
+}
+
+// GetContent fetches pageURL respecting the concurrency limit.
+func (c *DirectClient) GetContent(ctx context.Context, pageURL string) (string, error) {
+	// Acquire semaphore slot.
+	select {
+	case c.semaphore <- struct{}{}:
+	case <-ctx.Done():
+		return "", ctx.Err()
+	}
+	defer func() { <-c.semaphore }()
+
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet, pageURL, nil)
+	if err != nil {
+		return "", fmt.Errorf("browser: build request %s: %w", pageURL, err)
+	}
+	req.Header.Set("User-Agent", "Mozilla/5.0 (compatible; libnovel-runner/2)")
+	req.Header.Set("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8")
+	req.Header.Set("Accept-Language", "en-US,en;q=0.5")
+
+	resp, err := c.http.Do(req)
+	if err != nil {
+		return "", fmt.Errorf("browser: GET %s: %w", pageURL, err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode == http.StatusTooManyRequests {
+		delay := defaultRateLimitDelay
+		if ra := resp.Header.Get("Retry-After"); ra != "" {
+			if secs, err := strconv.Atoi(ra); err == nil && secs > 0 {
+				delay = time.Duration(secs) * time.Second
+			}
+		}
+		return "", &RateLimitError{RetryAfter: delay}
+	}
+
+	if resp.StatusCode >= 400 {
+		return "", fmt.Errorf("browser: GET %s returned %d", pageURL, resp.StatusCode)
+	}
+
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return "", fmt.Errorf("browser: read body %s: %w", pageURL, err)
+	}
+	return string(body), nil
+}
+
+// Do implements httputil.Client so DirectClient can be passed to RetryGet.
+func (c *DirectClient) Do(req *http.Request) (*http.Response, error) {
+	select {
+	case c.semaphore <- struct{}{}:
+	case <-req.Context().Done():
+		return nil, req.Context().Err()
+	}
+	defer func() { <-c.semaphore }()
+	return c.http.Do(req)
+}
+
+// ── Stub for testing ──────────────────────────────────────────────────────────
+
+// StubClient is a test double for Client. It returns pre-configured responses
+// keyed on URL. Calls to unknown URLs return an error.
+type StubClient struct {
+	mu      sync.Mutex
+	pages   map[string]string
+	errors  map[string]error
+	callLog []string
+}
+
+// NewStub creates a StubClient with no pages pre-loaded.
+func NewStub() *StubClient {
+	return &StubClient{
+		pages:  make(map[string]string),
+		errors: make(map[string]error),
+	}
+}
+
+// SetPage registers a URL → HTML body mapping.
+func (s *StubClient) SetPage(u, html string) {
+	s.mu.Lock()
+	s.pages[u] = html
+	s.mu.Unlock()
+}
+
+// SetError registers a URL → error mapping (returned instead of a body).
+func (s *StubClient) SetError(u string, err error) {
+	s.mu.Lock()
+	s.errors[u] = err
+	s.mu.Unlock()
+}
+
+// CallLog returns the ordered list of URLs that were requested.
+func (s *StubClient) CallLog() []string {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	out := make([]string, len(s.callLog))
+	copy(out, s.callLog)
+	return out
+}
+
+// GetContent returns the registered page or an error for the URL.
+func (s *StubClient) GetContent(_ context.Context, pageURL string) (string, error) {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	s.callLog = append(s.callLog, pageURL)
+	if err, ok := s.errors[pageURL]; ok {
+		return "", err
+	}
+	if html, ok := s.pages[pageURL]; ok {
+		return html, nil
+	}
+	return "", fmt.Errorf("stub: no page registered for %q", pageURL)
+}

v3/backend/internal/browser/browser_test.go

@@ -0,0 +1,141 @@
+package browser_test
+
+import (
+	"context"
+	"errors"
+	"net/http"
+	"net/http/httptest"
+	"sync"
+	"sync/atomic"
+	"testing"
+	"time"
+
+	"github.com/libnovel/backend/internal/browser"
+)
+
+func TestDirectClient_GetContent_Success(t *testing.T) {
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Write([]byte("<html>hello</html>"))
+	}))
+	defer srv.Close()
+
+	c := browser.NewDirectClient(browser.Config{MaxConcurrent: 2, Timeout: 5 * time.Second})
+	body, err := c.GetContent(context.Background(), srv.URL)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if body != "<html>hello</html>" {
+		t.Errorf("want <html>hello</html>, got %q", body)
+	}
+}
+
+func TestDirectClient_GetContent_4xxReturnsError(t *testing.T) {
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.WriteHeader(http.StatusNotFound)
+	}))
+	defer srv.Close()
+
+	c := browser.NewDirectClient(browser.Config{})
+	_, err := c.GetContent(context.Background(), srv.URL)
+	if err == nil {
+		t.Fatal("expected error for 404")
+	}
+}
+
+func TestDirectClient_SemaphoreBlocksConcurrency(t *testing.T) {
+	const maxConcurrent = 2
+	var inflight atomic.Int32
+	var peak atomic.Int32
+
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		n := inflight.Add(1)
+		if int(n) > int(peak.Load()) {
+			peak.Store(n)
+		}
+		time.Sleep(20 * time.Millisecond)
+		inflight.Add(-1)
+		w.Write([]byte("ok"))
+	}))
+	defer srv.Close()
+
+	c := browser.NewDirectClient(browser.Config{MaxConcurrent: maxConcurrent, Timeout: 5 * time.Second})
+
+	var wg sync.WaitGroup
+	for i := 0; i < 8; i++ {
+		wg.Add(1)
+		go func() {
+			defer wg.Done()
+			c.GetContent(context.Background(), srv.URL)
+		}()
+	}
+	wg.Wait()
+
+	if int(peak.Load()) > maxConcurrent {
+		t.Errorf("concurrent requests exceeded limit: peak=%d, limit=%d", peak.Load(), maxConcurrent)
+	}
+}
+
+func TestDirectClient_ContextCancel(t *testing.T) {
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		time.Sleep(200 * time.Millisecond)
+		w.Write([]byte("ok"))
+	}))
+	defer srv.Close()
+
+	ctx, cancel := context.WithCancel(context.Background())
+	cancel() // cancel before making the request
+
+	c := browser.NewDirectClient(browser.Config{})
+	_, err := c.GetContent(ctx, srv.URL)
+	if err == nil {
+		t.Fatal("expected context cancellation error")
+	}
+}
+
+// ── StubClient ────────────────────────────────────────────────────────────────
+
+func TestStubClient_ReturnsRegisteredPage(t *testing.T) {
+	stub := browser.NewStub()
+	stub.SetPage("http://example.com/page1", "<html>page1</html>")
+
+	body, err := stub.GetContent(context.Background(), "http://example.com/page1")
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if body != "<html>page1</html>" {
+		t.Errorf("want page1 html, got %q", body)
+	}
+}
+
+func TestStubClient_ReturnsRegisteredError(t *testing.T) {
+	stub := browser.NewStub()
+	want := errors.New("network failure")
+	stub.SetError("http://example.com/bad", want)
+
+	_, err := stub.GetContent(context.Background(), "http://example.com/bad")
+	if err == nil {
+		t.Fatal("expected error")
+	}
+}
+
+func TestStubClient_UnknownURLReturnsError(t *testing.T) {
+	stub := browser.NewStub()
+	_, err := stub.GetContent(context.Background(), "http://unknown.example.com/")
+	if err == nil {
+		t.Fatal("expected error for unknown URL")
+	}
+}
+
+func TestStubClient_CallLog(t *testing.T) {
+	stub := browser.NewStub()
+	stub.SetPage("http://example.com/a", "a")
+	stub.SetPage("http://example.com/b", "b")
+
+	stub.GetContent(context.Background(), "http://example.com/a")
+	stub.GetContent(context.Background(), "http://example.com/b")
+
+	log := stub.CallLog()
+	if len(log) != 2 || log[0] != "http://example.com/a" || log[1] != "http://example.com/b" {
+		t.Errorf("unexpected call log: %v", log)
+	}
+}

v3/backend/internal/config/config.go

@@ -0,0 +1,219 @@
+// Package config loads all service configuration from environment variables.
+// Both the runner and backend binaries call config.Load() at startup; each
+// uses only the sub-struct relevant to it.
+//
+// Every field has a documented default so the service starts sensibly without
+// any environment configuration (useful for local development).
+package config
+
+import (
+	"os"
+	"strconv"
+	"strings"
+	"time"
+)
+
+// PocketBase holds connection settings for the remote PocketBase instance.
+type PocketBase struct {
+	// URL is the base URL of the PocketBase instance, e.g. https://pb.libnovel.cc
+	URL string
+	// AdminEmail is the admin account email used for API authentication.
+	AdminEmail string
+	// AdminPassword is the admin account password.
+	AdminPassword string
+}
+
+// MinIO holds connection settings for the remote MinIO / S3-compatible store.
+type MinIO struct {
+	// Endpoint is the host:port of the MinIO S3 API, e.g. storage.libnovel.cc:443
+	Endpoint string
+	// PublicEndpoint is the browser-visible endpoint used for presigned URLs.
+	// Falls back to Endpoint when empty.
+	PublicEndpoint string
+	// AccessKey is the MinIO access key.
+	AccessKey string
+	// SecretKey is the MinIO secret key.
+	SecretKey string
+	// UseSSL enables TLS for the internal MinIO connection.
+	UseSSL bool
+	// PublicUseSSL enables TLS for presigned URL generation.
+	PublicUseSSL bool
+	// BucketChapters is the bucket that holds chapter markdown objects.
+	BucketChapters string
+	// BucketAudio is the bucket that holds generated audio MP3 objects.
+	BucketAudio string
+	// BucketAvatars is the bucket that holds user avatar images.
+	BucketAvatars string
+	// BucketBrowse is the bucket that holds cached browse page snapshots (JSON).
+	BucketBrowse string
+}
+
+// Kokoro holds connection settings for the Kokoro-FastAPI TTS service.
+type Kokoro struct {
+	// URL is the base URL of the Kokoro service, e.g. https://kokoro.libnovel.cc
+	// An empty string disables TTS generation.
+	URL string
+	// DefaultVoice is the voice used when none is specified.
+	DefaultVoice string
+}
+
+// HTTP holds settings for the HTTP server (backend only).
+type HTTP struct {
+	// Addr is the listen address, e.g. ":8080"
+	Addr string
+}
+
+// Meilisearch holds connection settings for the Meilisearch full-text search service.
+type Meilisearch struct {
+	// URL is the base URL of the Meilisearch instance, e.g. http://localhost:7700
+	// An empty string disables Meilisearch indexing and search.
+	URL string
+	// APIKey is the Meilisearch master/search API key.
+	APIKey string
+}
+
+// Valkey holds connection settings for the Valkey/Redis presign URL cache.
+type Valkey struct {
+	// Addr is the host:port of the Valkey instance, e.g. localhost:6379
+	// An empty string disables the Valkey cache (falls through to MinIO directly).
+	Addr string
+}
+
+// Runner holds settings specific to the runner/worker binary.
+type Runner struct {
+	// PollInterval is how often the runner checks PocketBase for pending tasks.
+	PollInterval time.Duration
+	// MaxConcurrentScrape limits simultaneous book-scrape goroutines.
+	MaxConcurrentScrape int
+	// MaxConcurrentAudio limits simultaneous audio-generation goroutines.
+	MaxConcurrentAudio int
+	// WorkerID is a unique identifier for this runner instance.
+	// Defaults to the system hostname.
+	WorkerID string
+	// Workers is the number of chapter-scraping goroutines per book.
+	Workers int
+	// Timeout is the per-request HTTP timeout for scraping.
+	Timeout time.Duration
+	// MetricsAddr is the listen address for the runner /metrics HTTP endpoint.
+	// Defaults to ":9091". Set to "" to disable.
+	MetricsAddr string
+	// CatalogueRefreshInterval is how often the runner walks the full catalogue,
+	// scrapes per-book metadata, downloads covers, and re-indexes in Meilisearch.
+	// Defaults to 24h. Set to 0 to use the default.
+	CatalogueRefreshInterval time.Duration
+}
+
+// Config is the top-level configuration struct consumed by both binaries.
+type Config struct {
+	PocketBase  PocketBase
+	MinIO       MinIO
+	Kokoro      Kokoro
+	HTTP        HTTP
+	Runner      Runner
+	Meilisearch Meilisearch
+	Valkey      Valkey
+	// LogLevel is one of "debug", "info", "warn", "error".
+	LogLevel string
+}
+
+// Load reads all configuration from environment variables and returns a
+// populated Config. Missing variables fall back to documented defaults.
+func Load() Config {
+	workerID, _ := os.Hostname()
+	if workerID == "" {
+		workerID = "runner-default"
+	}
+
+	return Config{
+		LogLevel: envOr("LOG_LEVEL", "info"),
+
+		PocketBase: PocketBase{
+			URL:           envOr("POCKETBASE_URL", "http://localhost:8090"),
+			AdminEmail:    envOr("POCKETBASE_ADMIN_EMAIL", "admin@libnovel.local"),
+			AdminPassword: envOr("POCKETBASE_ADMIN_PASSWORD", "changeme123"),
+		},
+
+		MinIO: MinIO{
+			Endpoint:       envOr("MINIO_ENDPOINT", "localhost:9000"),
+			PublicEndpoint: envOr("MINIO_PUBLIC_ENDPOINT", ""),
+			AccessKey:      envOr("MINIO_ACCESS_KEY", "admin"),
+			SecretKey:      envOr("MINIO_SECRET_KEY", "changeme123"),
+			UseSSL:         envBool("MINIO_USE_SSL", false),
+			PublicUseSSL:   envBool("MINIO_PUBLIC_USE_SSL", true),
+			BucketChapters: envOr("MINIO_BUCKET_CHAPTERS", "libnovel-chapters"),
+			BucketAudio:    envOr("MINIO_BUCKET_AUDIO", "libnovel-audio"),
+			BucketAvatars:  envOr("MINIO_BUCKET_AVATARS", "libnovel-avatars"),
+			BucketBrowse:   envOr("MINIO_BUCKET_BROWSE", "libnovel-browse"),
+		},
+
+		Kokoro: Kokoro{
+			URL:          envOr("KOKORO_URL", ""),
+			DefaultVoice: envOr("KOKORO_VOICE", "af_bella"),
+		},
+
+		HTTP: HTTP{
+			Addr: envOr("BACKEND_HTTP_ADDR", ":8080"),
+		},
+
+		Runner: Runner{
+			PollInterval:             envDuration("RUNNER_POLL_INTERVAL", 30*time.Second),
+			MaxConcurrentScrape:      envInt("RUNNER_MAX_CONCURRENT_SCRAPE", 1),
+			MaxConcurrentAudio:       envInt("RUNNER_MAX_CONCURRENT_AUDIO", 1),
+			WorkerID:                 envOr("RUNNER_WORKER_ID", workerID),
+			Workers:                  envInt("RUNNER_WORKERS", 0), // 0 → runtime.NumCPU()
+			Timeout:                  envDuration("RUNNER_TIMEOUT", 90*time.Second),
+			MetricsAddr:              envOr("RUNNER_METRICS_ADDR", ":9091"),
+			CatalogueRefreshInterval: envDuration("RUNNER_CATALOGUE_REFRESH_INTERVAL", 0),
+		},
+
+		Meilisearch: Meilisearch{
+			URL:    envOr("MEILI_URL", ""),
+			APIKey: envOr("MEILI_API_KEY", ""),
+		},
+
+		Valkey: Valkey{
+			Addr: envOr("VALKEY_ADDR", ""),
+		},
+	}
+}
+
+// ── helpers ───────────────────────────────────────────────────────────────────
+
+func envOr(key, fallback string) string {
+	if v := os.Getenv(key); v != "" {
+		return v
+	}
+	return fallback
+}
+
+func envBool(key string, fallback bool) bool {
+	v := os.Getenv(key)
+	if v == "" {
+		return fallback
+	}
+	return strings.ToLower(v) == "true"
+}
+
+func envInt(key string, fallback int) int {
+	v := os.Getenv(key)
+	if v == "" {
+		return fallback
+	}
+	n, err := strconv.Atoi(v)
+	if err != nil || n < 0 {
+		return fallback
+	}
+	return n
+}
+
+func envDuration(key string, fallback time.Duration) time.Duration {
+	v := os.Getenv(key)
+	if v == "" {
+		return fallback
+	}
+	d, err := time.ParseDuration(v)
+	if err != nil {
+		return fallback
+	}
+	return d
+}

v3/backend/internal/config/config_test.go

@@ -0,0 +1,127 @@
+package config_test
+
+import (
+	"os"
+	"testing"
+	"time"
+
+	"github.com/libnovel/backend/internal/config"
+)
+
+func TestLoad_Defaults(t *testing.T) {
+	// Unset all relevant vars so we test pure defaults.
+	unset := []string{
+		"LOG_LEVEL",
+		"POCKETBASE_URL", "POCKETBASE_ADMIN_EMAIL", "POCKETBASE_ADMIN_PASSWORD",
+		"MINIO_ENDPOINT", "MINIO_PUBLIC_ENDPOINT", "MINIO_ACCESS_KEY", "MINIO_SECRET_KEY",
+		"MINIO_USE_SSL", "MINIO_PUBLIC_USE_SSL",
+		"MINIO_BUCKET_CHAPTERS", "MINIO_BUCKET_AUDIO", "MINIO_BUCKET_AVATARS",
+		"KOKORO_URL", "KOKORO_VOICE",
+		"BACKEND_HTTP_ADDR",
+		"RUNNER_POLL_INTERVAL", "RUNNER_MAX_CONCURRENT_SCRAPE", "RUNNER_MAX_CONCURRENT_AUDIO",
+		"RUNNER_WORKER_ID", "RUNNER_WORKERS", "RUNNER_TIMEOUT",
+	}
+	for _, k := range unset {
+		t.Setenv(k, "")
+	}
+
+	cfg := config.Load()
+
+	if cfg.LogLevel != "info" {
+		t.Errorf("LogLevel: want info, got %q", cfg.LogLevel)
+	}
+	if cfg.PocketBase.URL != "http://localhost:8090" {
+		t.Errorf("PocketBase.URL: want http://localhost:8090, got %q", cfg.PocketBase.URL)
+	}
+	if cfg.MinIO.BucketChapters != "libnovel-chapters" {
+		t.Errorf("MinIO.BucketChapters: want libnovel-chapters, got %q", cfg.MinIO.BucketChapters)
+	}
+	if cfg.MinIO.UseSSL != false {
+		t.Errorf("MinIO.UseSSL: want false, got %v", cfg.MinIO.UseSSL)
+	}
+	if cfg.MinIO.PublicUseSSL != true {
+		t.Errorf("MinIO.PublicUseSSL: want true, got %v", cfg.MinIO.PublicUseSSL)
+	}
+	if cfg.Kokoro.DefaultVoice != "af_bella" {
+		t.Errorf("Kokoro.DefaultVoice: want af_bella, got %q", cfg.Kokoro.DefaultVoice)
+	}
+	if cfg.HTTP.Addr != ":8080" {
+		t.Errorf("HTTP.Addr: want :8080, got %q", cfg.HTTP.Addr)
+	}
+	if cfg.Runner.PollInterval != 30*time.Second {
+		t.Errorf("Runner.PollInterval: want 30s, got %v", cfg.Runner.PollInterval)
+	}
+	if cfg.Runner.MaxConcurrentScrape != 1 {
+		t.Errorf("Runner.MaxConcurrentScrape: want 1, got %d", cfg.Runner.MaxConcurrentScrape)
+	}
+	if cfg.Runner.MaxConcurrentAudio != 1 {
+		t.Errorf("Runner.MaxConcurrentAudio: want 1, got %d", cfg.Runner.MaxConcurrentAudio)
+	}
+}
+
+func TestLoad_EnvOverride(t *testing.T) {
+	t.Setenv("LOG_LEVEL", "debug")
+	t.Setenv("POCKETBASE_URL", "https://pb.libnovel.cc")
+	t.Setenv("MINIO_USE_SSL", "true")
+	t.Setenv("MINIO_PUBLIC_USE_SSL", "false")
+	t.Setenv("RUNNER_POLL_INTERVAL", "1m")
+	t.Setenv("RUNNER_MAX_CONCURRENT_SCRAPE", "5")
+	t.Setenv("RUNNER_WORKER_ID", "homelab-01")
+	t.Setenv("BACKEND_HTTP_ADDR", ":9090")
+	t.Setenv("KOKORO_URL", "https://kokoro.libnovel.cc")
+
+	cfg := config.Load()
+
+	if cfg.LogLevel != "debug" {
+		t.Errorf("LogLevel: want debug, got %q", cfg.LogLevel)
+	}
+	if cfg.PocketBase.URL != "https://pb.libnovel.cc" {
+		t.Errorf("PocketBase.URL: want https://pb.libnovel.cc, got %q", cfg.PocketBase.URL)
+	}
+	if !cfg.MinIO.UseSSL {
+		t.Error("MinIO.UseSSL: want true")
+	}
+	if cfg.MinIO.PublicUseSSL {
+		t.Error("MinIO.PublicUseSSL: want false")
+	}
+	if cfg.Runner.PollInterval != time.Minute {
+		t.Errorf("Runner.PollInterval: want 1m, got %v", cfg.Runner.PollInterval)
+	}
+	if cfg.Runner.MaxConcurrentScrape != 5 {
+		t.Errorf("Runner.MaxConcurrentScrape: want 5, got %d", cfg.Runner.MaxConcurrentScrape)
+	}
+	if cfg.Runner.WorkerID != "homelab-01" {
+		t.Errorf("Runner.WorkerID: want homelab-01, got %q", cfg.Runner.WorkerID)
+	}
+	if cfg.HTTP.Addr != ":9090" {
+		t.Errorf("HTTP.Addr: want :9090, got %q", cfg.HTTP.Addr)
+	}
+	if cfg.Kokoro.URL != "https://kokoro.libnovel.cc" {
+		t.Errorf("Kokoro.URL: want https://kokoro.libnovel.cc, got %q", cfg.Kokoro.URL)
+	}
+}
+
+func TestLoad_InvalidInt_FallsToDefault(t *testing.T) {
+	t.Setenv("RUNNER_MAX_CONCURRENT_SCRAPE", "notanumber")
+	cfg := config.Load()
+	if cfg.Runner.MaxConcurrentScrape != 1 {
+		t.Errorf("want default 1, got %d", cfg.Runner.MaxConcurrentScrape)
+	}
+}
+
+func TestLoad_InvalidDuration_FallsToDefault(t *testing.T) {
+	t.Setenv("RUNNER_POLL_INTERVAL", "notaduration")
+	cfg := config.Load()
+	if cfg.Runner.PollInterval != 30*time.Second {
+		t.Errorf("want default 30s, got %v", cfg.Runner.PollInterval)
+	}
+}
+
+func TestLoad_WorkerID_FallsToHostname(t *testing.T) {
+	t.Setenv("RUNNER_WORKER_ID", "")
+	cfg := config.Load()
+	host, _ := os.Hostname()
+	if host != "" && cfg.Runner.WorkerID != host {
+		t.Errorf("want hostname %q, got %q", host, cfg.Runner.WorkerID)
+	}
+}

v3/backend/internal/domain/domain.go

@@ -0,0 +1,132 @@
+// Package domain contains the core value types shared across all packages
+// in this module. It has zero internal imports — only the standard library.
+// Every other package imports domain; domain imports nothing from this module.
+package domain
+
+import "time"
+
+// ── Book types ────────────────────────────────────────────────────────────────
+
+// BookMeta carries all bibliographic information about a novel.
+type BookMeta struct {
+	Slug          string   `json:"slug"`
+	Title         string   `json:"title"`
+	Author        string   `json:"author"`
+	Cover         string   `json:"cover,omitempty"`
+	Status        string   `json:"status,omitempty"`
+	Genres        []string `json:"genres,omitempty"`
+	Summary       string   `json:"summary,omitempty"`
+	TotalChapters int      `json:"total_chapters,omitempty"`
+	SourceURL     string   `json:"source_url"`
+	Ranking       int      `json:"ranking,omitempty"`
+	Rating        float64  `json:"rating,omitempty"`
+}
+
+// CatalogueEntry is a lightweight book reference returned by catalogue pages.
+type CatalogueEntry struct {
+	Title string `json:"title"`
+	URL   string `json:"url"`
+}
+
+// ChapterRef is a reference to a single chapter returned by chapter-list pages.
+type ChapterRef struct {
+	Number int    `json:"number"`
+	Title  string `json:"title"`
+	URL    string `json:"url"`
+	Volume int    `json:"volume,omitempty"`
+}
+
+// Chapter contains the fully-extracted text of a single chapter.
+type Chapter struct {
+	Ref  ChapterRef `json:"ref"`
+	Text string     `json:"text"`
+}
+
+// RankingItem represents a single entry in the novel ranking list.
+type RankingItem struct {
+	Rank      int       `json:"rank"`
+	Slug      string    `json:"slug"`
+	Title     string    `json:"title"`
+	Author    string    `json:"author,omitempty"`
+	Cover     string    `json:"cover,omitempty"`
+	Status    string    `json:"status,omitempty"`
+	Genres    []string  `json:"genres,omitempty"`
+	SourceURL string    `json:"source_url,omitempty"`
+	Updated   time.Time `json:"updated,omitempty"`
+}
+
+// ── Storage record types ──────────────────────────────────────────────────────
+
+// ChapterInfo is a lightweight chapter descriptor stored in the index.
+type ChapterInfo struct {
+	Number int    `json:"number"`
+	Title  string `json:"title"`
+	Date   string `json:"date,omitempty"`
+}
+
+// ReadingProgress holds a single user's reading position for one book.
+type ReadingProgress struct {
+	Slug      string    `json:"slug"`
+	Chapter   int       `json:"chapter"`
+	UpdatedAt time.Time `json:"updated_at"`
+}
+
+// ── Task record types ─────────────────────────────────────────────────────────
+
+// TaskStatus enumerates the lifecycle states of any task.
+type TaskStatus string
+
+const (
+	TaskStatusPending   TaskStatus = "pending"
+	TaskStatusRunning   TaskStatus = "running"
+	TaskStatusDone      TaskStatus = "done"
+	TaskStatusFailed    TaskStatus = "failed"
+	TaskStatusCancelled TaskStatus = "cancelled"
+)
+
+// ScrapeTask represents a book-scraping job stored in PocketBase.
+type ScrapeTask struct {
+	ID              string     `json:"id"`
+	Kind            string     `json:"kind"`       // "catalogue" | "book" | "book_range"
+	TargetURL       string     `json:"target_url"` // non-empty for single-book tasks
+	FromChapter     int        `json:"from_chapter,omitempty"`
+	ToChapter       int        `json:"to_chapter,omitempty"`
+	WorkerID        string     `json:"worker_id,omitempty"`
+	Status          TaskStatus `json:"status"`
+	BooksFound      int        `json:"books_found"`
+	ChaptersScraped int        `json:"chapters_scraped"`
+	ChaptersSkipped int        `json:"chapters_skipped"`
+	Errors          int        `json:"errors"`
+	Started         time.Time  `json:"started"`
+	Finished        time.Time  `json:"finished,omitempty"`
+	ErrorMessage    string     `json:"error_message,omitempty"`
+}
+
+// ScrapeResult is the outcome reported by the runner after finishing a ScrapeTask.
+type ScrapeResult struct {
+	BooksFound      int    `json:"books_found"`
+	ChaptersScraped int    `json:"chapters_scraped"`
+	ChaptersSkipped int    `json:"chapters_skipped"`
+	Errors          int    `json:"errors"`
+	ErrorMessage    string `json:"error_message,omitempty"`
+}
+
+// AudioTask represents an audio-generation job stored in PocketBase.
+type AudioTask struct {
+	ID           string     `json:"id"`
+	CacheKey     string     `json:"cache_key"` // "slug/chapter/voice"
+	Slug         string     `json:"slug"`
+	Chapter      int        `json:"chapter"`
+	Voice        string     `json:"voice"`
+	WorkerID     string     `json:"worker_id,omitempty"`
+	Status       TaskStatus `json:"status"`
+	ErrorMessage string     `json:"error_message,omitempty"`
+	Started      time.Time  `json:"started"`
+	Finished     time.Time  `json:"finished,omitempty"`
+}
+
+// AudioResult is the outcome reported by the runner after finishing an AudioTask.
+type AudioResult struct {
+	ObjectKey    string `json:"object_key,omitempty"`
+	ErrorMessage string `json:"error_message,omitempty"`
+}

v3/backend/internal/domain/domain_test.go

@@ -0,0 +1,104 @@
+package domain_test
+
+import (
+	"encoding/json"
+	"testing"
+	"time"
+
+	"github.com/libnovel/backend/internal/domain"
+)
+
+func TestBookMeta_JSONRoundtrip(t *testing.T) {
+	orig := domain.BookMeta{
+		Slug:          "a-great-novel",
+		Title:         "A Great Novel",
+		Author:        "Jane Doe",
+		Cover:         "https://example.com/cover.jpg",
+		Status:        "Ongoing",
+		Genres:        []string{"Fantasy", "Action"},
+		Summary:       "A thrilling tale.",
+		TotalChapters: 120,
+		SourceURL:     "https://novelfire.net/book/a-great-novel",
+		Ranking:       3,
+	}
+
+	b, err := json.Marshal(orig)
+	if err != nil {
+		t.Fatalf("marshal: %v", err)
+	}
+	var got domain.BookMeta
+	if err := json.Unmarshal(b, &got); err != nil {
+		t.Fatalf("unmarshal: %v", err)
+	}
+	if got.Slug != orig.Slug {
+		t.Errorf("Slug: want %q, got %q", orig.Slug, got.Slug)
+	}
+	if got.TotalChapters != orig.TotalChapters {
+		t.Errorf("TotalChapters: want %d, got %d", orig.TotalChapters, got.TotalChapters)
+	}
+	if len(got.Genres) != len(orig.Genres) {
+		t.Errorf("Genres len: want %d, got %d", len(orig.Genres), len(got.Genres))
+	}
+}
+
+func TestChapterRef_JSONRoundtrip(t *testing.T) {
+	orig := domain.ChapterRef{Number: 42, Title: "The Battle", URL: "https://example.com/ch-42", Volume: 2}
+	b, _ := json.Marshal(orig)
+	var got domain.ChapterRef
+	json.Unmarshal(b, &got)
+	if got != orig {
+		t.Errorf("want %+v, got %+v", orig, got)
+	}
+}
+
+func TestRankingItem_JSONRoundtrip(t *testing.T) {
+	now := time.Now().Truncate(time.Second)
+	orig := domain.RankingItem{
+		Rank:      1,
+		Slug:      "top-novel",
+		Title:     "Top Novel",
+		SourceURL: "https://novelfire.net/book/top-novel",
+		Updated:   now,
+	}
+	b, _ := json.Marshal(orig)
+	var got domain.RankingItem
+	json.Unmarshal(b, &got)
+	if got.Rank != orig.Rank || got.Slug != orig.Slug {
+		t.Errorf("want %+v, got %+v", orig, got)
+	}
+}
+
+func TestScrapeResult_JSONRoundtrip(t *testing.T) {
+	orig := domain.ScrapeResult{BooksFound: 10, ChaptersScraped: 200, ChaptersSkipped: 5, Errors: 1, ErrorMessage: "one error"}
+	b, _ := json.Marshal(orig)
+	var got domain.ScrapeResult
+	json.Unmarshal(b, &got)
+	if got != orig {
+		t.Errorf("want %+v, got %+v", orig, got)
+	}
+}
+
+func TestAudioResult_JSONRoundtrip(t *testing.T) {
+	orig := domain.AudioResult{ObjectKey: "audio/slug/1/af_bella.mp3"}
+	b, _ := json.Marshal(orig)
+	var got domain.AudioResult
+	json.Unmarshal(b, &got)
+	if got != orig {
+		t.Errorf("want %+v, got %+v", orig, got)
+	}
+}
+
+func TestTaskStatus_Values(t *testing.T) {
+	cases := []domain.TaskStatus{
+		domain.TaskStatusPending,
+		domain.TaskStatusRunning,
+		domain.TaskStatusDone,
+		domain.TaskStatusFailed,
+		domain.TaskStatusCancelled,
+	}
+	for _, s := range cases {
+		if s == "" {
+			t.Errorf("TaskStatus constant must not be empty")
+		}
+	}
+}

v3/backend/internal/httputil/httputil.go

@@ -0,0 +1,124 @@
+// Package httputil provides shared HTTP helpers used by both the runner and
+// backend binaries. It has no imports from this module — only the standard
+// library — so it is safe to import from anywhere in the dependency graph.
+package httputil
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"net/http"
+	"time"
+)
+
+// Client is the minimal interface for making HTTP GET requests.
+// *http.Client satisfies this interface.
+type Client interface {
+	Do(req *http.Request) (*http.Response, error)
+}
+
+// ErrMaxRetries is returned when RetryGet exhausts all attempts.
+var ErrMaxRetries = errors.New("httputil: max retries exceeded")
+
+// errClientError is returned by doGet for 4xx responses; it signals that the
+// request should NOT be retried (the client is at fault).
+var errClientError = errors.New("httputil: client error")
+
+// RetryGet fetches url using client, retrying on network errors or 5xx
+// responses with exponential backoff. It returns the full response body as a
+// string on success.
+//
+//   - maxAttempts: total number of attempts (must be >= 1)
+//   - baseDelay:   initial wait before the second attempt; doubles each retry
+func RetryGet(ctx context.Context, client Client, url string, maxAttempts int, baseDelay time.Duration) (string, error) {
+	if maxAttempts < 1 {
+		maxAttempts = 1
+	}
+	delay := baseDelay
+
+	var lastErr error
+	for attempt := 0; attempt < maxAttempts; attempt++ {
+		if attempt > 0 {
+			select {
+			case <-ctx.Done():
+				return "", ctx.Err()
+			case <-time.After(delay):
+			}
+			delay *= 2
+		}
+
+		body, err := doGet(ctx, client, url)
+		if err == nil {
+			return body, nil
+		}
+		lastErr = err
+
+		// Do not retry on context cancellation.
+		if ctx.Err() != nil {
+			return "", ctx.Err()
+		}
+		// Do not retry on 4xx — the client is at fault.
+		if errors.Is(err, errClientError) {
+			return "", err
+		}
+	}
+
+	return "", fmt.Errorf("%w after %d attempts: %w", ErrMaxRetries, maxAttempts, lastErr)
+}
+
+func doGet(ctx context.Context, client Client, url string) (string, error) {
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet, url, nil)
+	if err != nil {
+		return "", fmt.Errorf("build request: %w", err)
+	}
+	req.Header.Set("User-Agent", "Mozilla/5.0 (compatible; libnovel-runner/2)")
+
+	resp, err := client.Do(req)
+	if err != nil {
+		return "", fmt.Errorf("GET %s: %w", url, err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode >= 500 {
+		return "", fmt.Errorf("GET %s: server error %d", url, resp.StatusCode)
+	}
+	if resp.StatusCode >= 400 {
+		return "", fmt.Errorf("%w: GET %s: client error %d", errClientError, url, resp.StatusCode)
+	}
+
+	raw, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return "", fmt.Errorf("read body %s: %w", url, err)
+	}
+	return string(raw), nil
+}
+
+// WriteJSON writes v as JSON to w with the given HTTP status code and sets the
+// Content-Type header to application/json.
+func WriteJSON(w http.ResponseWriter, status int, v any) {
+	w.Header().Set("Content-Type", "application/json")
+	w.WriteHeader(status)
+	_ = json.NewEncoder(w).Encode(v)
+}
+
+// WriteError writes a JSON error object {"error": msg} with the given status.
+func WriteError(w http.ResponseWriter, status int, msg string) {
+	WriteJSON(w, status, map[string]string{"error": msg})
+}
+
+// maxBodyBytes is the limit applied by DecodeJSON to prevent unbounded reads.
+const maxBodyBytes = 1 << 20 // 1 MiB
+
+// DecodeJSON decodes a JSON request body into v. It enforces a 1 MiB size
+// limit and returns a descriptive error on any failure.
+func DecodeJSON(r *http.Request, v any) error {
+	r.Body = http.MaxBytesReader(nil, r.Body, maxBodyBytes)
+	dec := json.NewDecoder(r.Body)
+	dec.DisallowUnknownFields()
+	if err := dec.Decode(v); err != nil {
+		return fmt.Errorf("decode JSON body: %w", err)
+	}
+	return nil
+}

v3/backend/internal/httputil/httputil_test.go

@@ -0,0 +1,181 @@
+package httputil_test
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/libnovel/backend/internal/httputil"
+)
+
+// ── RetryGet ──────────────────────────────────────────────────────────────────
+
+func TestRetryGet_ImmediateSuccess(t *testing.T) {
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Write([]byte("hello"))
+	}))
+	defer srv.Close()
+
+	body, err := httputil.RetryGet(context.Background(), srv.Client(), srv.URL, 3, time.Millisecond)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if body != "hello" {
+		t.Errorf("want hello, got %q", body)
+	}
+}
+
+func TestRetryGet_RetriesOn5xx(t *testing.T) {
+	calls := 0
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		calls++
+		if calls < 3 {
+			w.WriteHeader(http.StatusServiceUnavailable)
+			return
+		}
+		w.Write([]byte("ok"))
+	}))
+	defer srv.Close()
+
+	body, err := httputil.RetryGet(context.Background(), srv.Client(), srv.URL, 5, time.Millisecond)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if body != "ok" {
+		t.Errorf("want ok, got %q", body)
+	}
+	if calls != 3 {
+		t.Errorf("want 3 calls, got %d", calls)
+	}
+}
+
+func TestRetryGet_MaxAttemptsExceeded(t *testing.T) {
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.WriteHeader(http.StatusInternalServerError)
+	}))
+	defer srv.Close()
+
+	_, err := httputil.RetryGet(context.Background(), srv.Client(), srv.URL, 3, time.Millisecond)
+	if err == nil {
+		t.Fatal("expected error, got nil")
+	}
+}
+
+func TestRetryGet_ContextCancelDuringBackoff(t *testing.T) {
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.WriteHeader(http.StatusServiceUnavailable)
+	}))
+	defer srv.Close()
+
+	ctx, cancel := context.WithCancel(context.Background())
+
+	// Cancel after first failed attempt hits the backoff wait.
+	go func() { time.Sleep(5 * time.Millisecond); cancel() }()
+
+	_, err := httputil.RetryGet(ctx, srv.Client(), srv.URL, 10, 500*time.Millisecond)
+	if err == nil {
+		t.Fatal("expected context cancellation error")
+	}
+}
+
+func TestRetryGet_NoRetryOn4xx(t *testing.T) {
+	calls := 0
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		calls++
+		w.WriteHeader(http.StatusNotFound)
+	}))
+	defer srv.Close()
+
+	_, err := httputil.RetryGet(context.Background(), srv.Client(), srv.URL, 5, time.Millisecond)
+	if err == nil {
+		t.Fatal("expected error for 404")
+	}
+	// 4xx is NOT retried — should be exactly 1 call.
+	if calls != 1 {
+		t.Errorf("want 1 call for 4xx, got %d", calls)
+	}
+}
+
+// ── WriteJSON ─────────────────────────────────────────────────────────────────
+
+func TestWriteJSON_SetsHeadersAndStatus(t *testing.T) {
+	rr := httptest.NewRecorder()
+	httputil.WriteJSON(rr, http.StatusCreated, map[string]string{"key": "val"})
+
+	if rr.Code != http.StatusCreated {
+		t.Errorf("status: want 201, got %d", rr.Code)
+	}
+	if ct := rr.Header().Get("Content-Type"); ct != "application/json" {
+		t.Errorf("Content-Type: want application/json, got %q", ct)
+	}
+	var got map[string]string
+	if err := json.NewDecoder(rr.Body).Decode(&got); err != nil {
+		t.Fatalf("decode body: %v", err)
+	}
+	if got["key"] != "val" {
+		t.Errorf("body key: want val, got %q", got["key"])
+	}
+}
+
+// ── WriteError ────────────────────────────────────────────────────────────────
+
+func TestWriteError_Format(t *testing.T) {
+	rr := httptest.NewRecorder()
+	httputil.WriteError(rr, http.StatusBadRequest, "bad input")
+
+	if rr.Code != http.StatusBadRequest {
+		t.Errorf("status: want 400, got %d", rr.Code)
+	}
+	var got map[string]string
+	json.NewDecoder(rr.Body).Decode(&got)
+	if got["error"] != "bad input" {
+		t.Errorf("error field: want bad input, got %q", got["error"])
+	}
+}
+
+// ── DecodeJSON ────────────────────────────────────────────────────────────────
+
+func TestDecodeJSON_HappyPath(t *testing.T) {
+	body := `{"name":"test","value":42}`
+	req := httptest.NewRequest(http.MethodPost, "/", strings.NewReader(body))
+	req.Header.Set("Content-Type", "application/json")
+
+	var payload struct {
+		Name  string `json:"name"`
+		Value int    `json:"value"`
+	}
+	if err := httputil.DecodeJSON(req, &payload); err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if payload.Name != "test" || payload.Value != 42 {
+		t.Errorf("unexpected payload: %+v", payload)
+	}
+}
+
+func TestDecodeJSON_UnknownFieldReturnsError(t *testing.T) {
+	body := `{"name":"test","unknown_field":"boom"}`
+	req := httptest.NewRequest(http.MethodPost, "/", strings.NewReader(body))
+
+	var payload struct {
+		Name string `json:"name"`
+	}
+	if err := httputil.DecodeJSON(req, &payload); err == nil {
+		t.Fatal("expected error for unknown field, got nil")
+	}
+}
+
+func TestDecodeJSON_BodyTooLarge(t *testing.T) {
+	// Build a body > 1 MiB.
+	big := bytes.Repeat([]byte("a"), 2<<20)
+	req := httptest.NewRequest(http.MethodPost, "/", bytes.NewReader(big))
+
+	var payload map[string]any
+	if err := httputil.DecodeJSON(req, &payload); err == nil {
+		t.Fatal("expected error for oversized body, got nil")
+	}
+}

v3/backend/internal/kokoro/client.go

@@ -0,0 +1,160 @@
+// Package kokoro provides a client for the Kokoro-FastAPI TTS service.
+//
+// The Kokoro API is an OpenAI-compatible audio speech API that returns a
+// download link (X-Download-Path header) instead of streaming audio directly.
+// GenerateAudio handles the two-step flow: POST /v1/audio/speech → GET /v1/download/{file}.
+package kokoro
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"strings"
+	"time"
+)
+
+// Client is the interface for interacting with the Kokoro TTS service.
+type Client interface {
+	// GenerateAudio synthesises text using voice and returns raw MP3 bytes.
+	GenerateAudio(ctx context.Context, text, voice string) ([]byte, error)
+
+	// ListVoices returns the available voice IDs. Falls back to an empty slice
+	// on error — callers should treat an empty list as "service unavailable".
+	ListVoices(ctx context.Context) ([]string, error)
+}
+
+// httpClient is the concrete Kokoro HTTP client.
+type httpClient struct {
+	baseURL string
+	http    *http.Client
+}
+
+// New returns a Kokoro Client targeting baseURL (e.g. "https://kokoro.example.com").
+func New(baseURL string) Client {
+	return &httpClient{
+		baseURL: strings.TrimRight(baseURL, "/"),
+		http:    &http.Client{Timeout: 10 * time.Minute},
+	}
+}
+
+// GenerateAudio calls POST /v1/audio/speech (return_download_link=true) and then
+// downloads the resulting MP3 from GET /v1/download/{filename}.
+func (c *httpClient) GenerateAudio(ctx context.Context, text, voice string) ([]byte, error) {
+	if text == "" {
+		return nil, fmt.Errorf("kokoro: empty text")
+	}
+	if voice == "" {
+		voice = "af_bella"
+	}
+
+	// ── Step 1: request generation ────────────────────────────────────────────
+	reqBody, err := json.Marshal(map[string]any{
+		"model":                "kokoro",
+		"input":                text,
+		"voice":                voice,
+		"response_format":      "mp3",
+		"speed":                1.0,
+		"stream":               false,
+		"return_download_link": true,
+	})
+	if err != nil {
+		return nil, fmt.Errorf("kokoro: marshal request: %w", err)
+	}
+
+	req, err := http.NewRequestWithContext(ctx, http.MethodPost,
+		c.baseURL+"/v1/audio/speech", bytes.NewReader(reqBody))
+	if err != nil {
+		return nil, fmt.Errorf("kokoro: build speech request: %w", err)
+	}
+	req.Header.Set("Content-Type", "application/json")
+
+	resp, err := c.http.Do(req)
+	if err != nil {
+		return nil, fmt.Errorf("kokoro: speech request: %w", err)
+	}
+	defer resp.Body.Close()
+	_, _ = io.Copy(io.Discard, resp.Body)
+
+	if resp.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("kokoro: speech returned %d", resp.StatusCode)
+	}
+
+	dlPath := resp.Header.Get("X-Download-Path")
+	if dlPath == "" {
+		return nil, fmt.Errorf("kokoro: no X-Download-Path header in response")
+	}
+	filename := dlPath
+	if idx := strings.LastIndex(dlPath, "/"); idx >= 0 {
+		filename = dlPath[idx+1:]
+	}
+	if filename == "" {
+		return nil, fmt.Errorf("kokoro: empty filename in X-Download-Path: %q", dlPath)
+	}
+
+	// ── Step 2: download the generated file ───────────────────────────────────
+	dlURL := c.baseURL + "/v1/download/" + filename
+	dlReq, err := http.NewRequestWithContext(ctx, http.MethodGet, dlURL, nil)
+	if err != nil {
+		return nil, fmt.Errorf("kokoro: build download request: %w", err)
+	}
+
+	dlResp, err := c.http.Do(dlReq)
+	if err != nil {
+		return nil, fmt.Errorf("kokoro: download request: %w", err)
+	}
+	defer dlResp.Body.Close()
+
+	if dlResp.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("kokoro: download returned %d", dlResp.StatusCode)
+	}
+
+	data, err := io.ReadAll(dlResp.Body)
+	if err != nil {
+		return nil, fmt.Errorf("kokoro: read download body: %w", err)
+	}
+	return data, nil
+}
+
+// ListVoices calls GET /v1/audio/voices and returns the list of voice IDs.
+func (c *httpClient) ListVoices(ctx context.Context) ([]string, error) {
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet,
+		c.baseURL+"/v1/audio/voices", nil)
+	if err != nil {
+		return nil, fmt.Errorf("kokoro: build voices request: %w", err)
+	}
+
+	resp, err := c.http.Do(req)
+	if err != nil {
+		return nil, fmt.Errorf("kokoro: voices request: %w", err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		_, _ = io.Copy(io.Discard, resp.Body)
+		return nil, fmt.Errorf("kokoro: voices returned %d", resp.StatusCode)
+	}
+
+	var result struct {
+		Voices []string `json:"voices"`
+	}
+	if err := json.NewDecoder(resp.Body).Decode(&result); err != nil {
+		return nil, fmt.Errorf("kokoro: decode voices response: %w", err)
+	}
+	return result.Voices, nil
+}
+
+// VoiceSampleKey returns the MinIO object key for a voice sample MP3.
+// Key: _voice-samples/{voice}.mp3 (sanitised).
+func VoiceSampleKey(voice string) string {
+	safe := strings.Map(func(r rune) rune {
+		if (r >= 'a' && r <= 'z') || (r >= 'A' && r <= 'Z') ||
+			(r >= '0' && r <= '9') || r == '_' || r == '-' {
+			return r
+		}
+		return '_'
+	}, voice)
+	return fmt.Sprintf("_voice-samples/%s.mp3", safe)
+}

v3/backend/internal/kokoro/client_test.go

@@ -0,0 +1,291 @@
+package kokoro_test
+
+import (
+	"context"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+
+	"github.com/libnovel/backend/internal/kokoro"
+)
+
+// ── VoiceSampleKey ────────────────────────────────────────────────────────────
+
+func TestVoiceSampleKey(t *testing.T) {
+	tests := []struct {
+		voice string
+		want  string
+	}{
+		{"af_bella", "_voice-samples/af_bella.mp3"},
+		{"am_echo", "_voice-samples/am_echo.mp3"},
+		{"voice with spaces", "_voice-samples/voice_with_spaces.mp3"},
+		{"special!@#chars", "_voice-samples/special___chars.mp3"},
+		{"", "_voice-samples/.mp3"},
+	}
+	for _, tt := range tests {
+		t.Run(tt.voice, func(t *testing.T) {
+			got := kokoro.VoiceSampleKey(tt.voice)
+			if got != tt.want {
+				t.Errorf("VoiceSampleKey(%q) = %q, want %q", tt.voice, got, tt.want)
+			}
+		})
+	}
+}
+
+// ── GenerateAudio ─────────────────────────────────────────────────────────────
+
+func TestGenerateAudio_EmptyText(t *testing.T) {
+	srv := httptest.NewServer(http.NotFoundHandler())
+	defer srv.Close()
+
+	c := kokoro.New(srv.URL)
+	_, err := c.GenerateAudio(context.Background(), "", "af_bella")
+	if err == nil {
+		t.Fatal("expected error for empty text, got nil")
+	}
+	if !strings.Contains(err.Error(), "empty text") {
+		t.Errorf("expected 'empty text' in error, got: %v", err)
+	}
+}
+
+func TestGenerateAudio_DefaultVoice(t *testing.T) {
+	// Tracks that the voice defaults to af_bella when empty.
+	var capturedBody string
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.URL.Path == "/v1/audio/speech" {
+			buf := make([]byte, 512)
+			n, _ := r.Body.Read(buf)
+			capturedBody = string(buf[:n])
+			w.Header().Set("X-Download-Path", "/download/test_file.mp3")
+			w.WriteHeader(http.StatusOK)
+			return
+		}
+		if strings.HasPrefix(r.URL.Path, "/v1/download/") {
+			w.WriteHeader(http.StatusOK)
+			_, _ = w.Write([]byte("fake-mp3-data"))
+			return
+		}
+		http.NotFound(w, r)
+	}))
+	defer srv.Close()
+
+	c := kokoro.New(srv.URL)
+	data, err := c.GenerateAudio(context.Background(), "hello world", "")
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if string(data) != "fake-mp3-data" {
+		t.Errorf("unexpected data: %q", string(data))
+	}
+	if !strings.Contains(capturedBody, `"af_bella"`) {
+		t.Errorf("expected default voice af_bella in request body, got: %s", capturedBody)
+	}
+}
+
+func TestGenerateAudio_SpeechNon200(t *testing.T) {
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.URL.Path == "/v1/audio/speech" {
+			w.WriteHeader(http.StatusInternalServerError)
+			return
+		}
+		http.NotFound(w, r)
+	}))
+	defer srv.Close()
+
+	c := kokoro.New(srv.URL)
+	_, err := c.GenerateAudio(context.Background(), "text", "af_bella")
+	if err == nil {
+		t.Fatal("expected error for non-200 speech response")
+	}
+	if !strings.Contains(err.Error(), "500") {
+		t.Errorf("expected 500 in error, got: %v", err)
+	}
+}
+
+func TestGenerateAudio_NoDownloadPathHeader(t *testing.T) {
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.URL.Path == "/v1/audio/speech" {
+			// No X-Download-Path header
+			w.WriteHeader(http.StatusOK)
+			return
+		}
+		http.NotFound(w, r)
+	}))
+	defer srv.Close()
+
+	c := kokoro.New(srv.URL)
+	_, err := c.GenerateAudio(context.Background(), "text", "af_bella")
+	if err == nil {
+		t.Fatal("expected error for missing X-Download-Path")
+	}
+	if !strings.Contains(err.Error(), "X-Download-Path") {
+		t.Errorf("expected X-Download-Path in error, got: %v", err)
+	}
+}
+
+func TestGenerateAudio_DownloadFails(t *testing.T) {
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.URL.Path == "/v1/audio/speech" {
+			w.Header().Set("X-Download-Path", "/v1/download/speech.mp3")
+			w.WriteHeader(http.StatusOK)
+			return
+		}
+		if strings.HasPrefix(r.URL.Path, "/v1/download/") {
+			w.WriteHeader(http.StatusNotFound)
+			return
+		}
+		http.NotFound(w, r)
+	}))
+	defer srv.Close()
+
+	c := kokoro.New(srv.URL)
+	_, err := c.GenerateAudio(context.Background(), "text", "af_bella")
+	if err == nil {
+		t.Fatal("expected error for failed download")
+	}
+	if !strings.Contains(err.Error(), "404") {
+		t.Errorf("expected 404 in error, got: %v", err)
+	}
+}
+
+func TestGenerateAudio_FullPath(t *testing.T) {
+	// X-Download-Path with a full path: extract just filename.
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.URL.Path == "/v1/audio/speech" {
+			w.Header().Set("X-Download-Path", "/some/nested/path/audio_abc123.mp3")
+			w.WriteHeader(http.StatusOK)
+			return
+		}
+		if r.URL.Path == "/v1/download/audio_abc123.mp3" {
+			_, _ = w.Write([]byte("audio-bytes"))
+			return
+		}
+		http.NotFound(w, r)
+	}))
+	defer srv.Close()
+
+	c := kokoro.New(srv.URL)
+	data, err := c.GenerateAudio(context.Background(), "text", "af_bella")
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if string(data) != "audio-bytes" {
+		t.Errorf("unexpected data: %q", string(data))
+	}
+}
+
+func TestGenerateAudio_ContextCancelled(t *testing.T) {
+	// Server that hangs — context should cancel before we get a response.
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		// Never respond.
+		select {}
+	}))
+	defer srv.Close()
+
+	ctx, cancel := context.WithCancel(context.Background())
+	cancel() // cancel immediately
+
+	c := kokoro.New(srv.URL)
+	_, err := c.GenerateAudio(ctx, "text", "af_bella")
+	if err == nil {
+		t.Fatal("expected error for cancelled context")
+	}
+}
+
+// ── ListVoices ────────────────────────────────────────────────────────────────
+
+func TestListVoices_Success(t *testing.T) {
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.URL.Path == "/v1/audio/voices" {
+			w.Header().Set("Content-Type", "application/json")
+			_, _ = w.Write([]byte(`{"voices":["af_bella","am_adam","bf_emma"]}`))
+			return
+		}
+		http.NotFound(w, r)
+	}))
+	defer srv.Close()
+
+	c := kokoro.New(srv.URL)
+	voices, err := c.ListVoices(context.Background())
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if len(voices) != 3 {
+		t.Errorf("expected 3 voices, got %d: %v", len(voices), voices)
+	}
+	if voices[0] != "af_bella" {
+		t.Errorf("expected first voice to be af_bella, got %q", voices[0])
+	}
+}
+
+func TestListVoices_Non200(t *testing.T) {
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.WriteHeader(http.StatusServiceUnavailable)
+	}))
+	defer srv.Close()
+
+	c := kokoro.New(srv.URL)
+	_, err := c.ListVoices(context.Background())
+	if err == nil {
+		t.Fatal("expected error for non-200 response")
+	}
+	if !strings.Contains(err.Error(), "503") {
+		t.Errorf("expected 503 in error, got: %v", err)
+	}
+}
+
+func TestListVoices_MalformedJSON(t *testing.T) {
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.WriteHeader(http.StatusOK)
+		_, _ = w.Write([]byte(`not-json`))
+	}))
+	defer srv.Close()
+
+	c := kokoro.New(srv.URL)
+	_, err := c.ListVoices(context.Background())
+	if err == nil {
+		t.Fatal("expected error for malformed JSON")
+	}
+}
+
+func TestListVoices_EmptyVoices(t *testing.T) {
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Content-Type", "application/json")
+		_, _ = w.Write([]byte(`{"voices":[]}`))
+	}))
+	defer srv.Close()
+
+	c := kokoro.New(srv.URL)
+	voices, err := c.ListVoices(context.Background())
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if len(voices) != 0 {
+		t.Errorf("expected 0 voices, got %d", len(voices))
+	}
+}
+
+// ── New ───────────────────────────────────────────────────────────────────────
+
+func TestNew_TrailingSlashStripped(t *testing.T) {
+	// Verify that a trailing slash on baseURL doesn't produce double-slash paths.
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.URL.Path == "/v1/audio/voices" {
+			w.Header().Set("Content-Type", "application/json")
+			_, _ = w.Write([]byte(`{"voices":["af_bella"]}`))
+			return
+		}
+		http.NotFound(w, r)
+	}))
+	defer srv.Close()
+
+	c := kokoro.New(srv.URL + "/") // trailing slash
+	voices, err := c.ListVoices(context.Background())
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if len(voices) == 0 {
+		t.Error("expected at least one voice")
+	}
+}

v3/backend/internal/meili/client.go

@@ -0,0 +1,257 @@
+// Package meili provides a thin Meilisearch client for indexing and searching
+// locally scraped books.
+//
+// Index:
+//   - Name: "books"
+//   - Primary key: "slug"
+//   - Searchable attributes: title, author, genres, summary
+//   - Filterable attributes: status, genres
+//   - Sortable attributes: rank, rating, total_chapters
+//
+// The client is intentionally simple: UpsertBook and Search only. All
+// Meilisearch-specific details (index management, attribute configuration)
+// are handled once in Configure(), called at startup.
+package meili
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"strings"
+
+	"github.com/libnovel/backend/internal/domain"
+	"github.com/meilisearch/meilisearch-go"
+)
+
+const indexName = "books"
+
+// Client is the interface for Meilisearch operations used by runner and backend.
+type Client interface {
+	// UpsertBook adds or updates a book document in the search index.
+	UpsertBook(ctx context.Context, book domain.BookMeta) error
+	// Search returns up to limit books matching query.
+	Search(ctx context.Context, query string, limit int) ([]domain.BookMeta, error)
+	// Catalogue queries books with optional filters, sort, and pagination.
+	// Returns books and the total hit count for pagination.
+	Catalogue(ctx context.Context, q CatalogueQuery) ([]domain.BookMeta, int64, error)
+}
+
+// CatalogueQuery holds parameters for the /api/catalogue endpoint.
+type CatalogueQuery struct {
+	Q      string // full-text query (may be empty for browse)
+	Genre  string // genre filter, e.g. "fantasy" or "all"
+	Status string // status filter, e.g. "ongoing", "completed", or "all"
+	Sort   string // sort field: "popular", "new", "top-rated", "rank", ""
+	Page   int    // 1-indexed
+	Limit  int    // items per page, default 20
+}
+
+// MeiliClient wraps the meilisearch-go SDK.
+type MeiliClient struct {
+	idx meilisearch.IndexManager
+}
+
+// New creates a MeiliClient. Call Configure() once at startup to ensure the
+// index exists and has the correct attribute settings.
+func New(host, apiKey string) *MeiliClient {
+	cli := meilisearch.New(host, meilisearch.WithAPIKey(apiKey))
+	return &MeiliClient{idx: cli.Index(indexName)}
+}
+
+// Configure creates the index if absent and sets searchable/filterable
+// attributes. It is idempotent — safe to call on every startup.
+func Configure(host, apiKey string) error {
+	cli := meilisearch.New(host, meilisearch.WithAPIKey(apiKey))
+
+	// Create index with primary key. Returns 202 if exists — ignore.
+	task, err := cli.CreateIndex(&meilisearch.IndexConfig{
+		Uid:        indexName,
+		PrimaryKey: "slug",
+	})
+	if err != nil {
+		// 400 "index_already_exists" is not an error here; the SDK returns
+		// an error with Code "index_already_exists" which we can ignore.
+		// Any other error is fatal.
+		if apiErr, ok := err.(*meilisearch.Error); ok && apiErr.MeilisearchApiError.Code == "index_already_exists" {
+			// already exists — continue
+		} else {
+			return fmt.Errorf("meili: create index: %w", err)
+		}
+	} else {
+		_ = task // task is async; we don't wait for it
+	}
+
+	idx := cli.Index(indexName)
+
+	searchable := []string{"title", "author", "genres", "summary"}
+	if _, err := idx.UpdateSearchableAttributes(&searchable); err != nil {
+		return fmt.Errorf("meili: update searchable attributes: %w", err)
+	}
+
+	filterable := []interface{}{"status", "genres"}
+	if _, err := idx.UpdateFilterableAttributes(&filterable); err != nil {
+		return fmt.Errorf("meili: update filterable attributes: %w", err)
+	}
+
+	sortable := []string{"rank", "rating", "total_chapters"}
+	if _, err := idx.UpdateSortableAttributes(&sortable); err != nil {
+		return fmt.Errorf("meili: update sortable attributes: %w", err)
+	}
+
+	return nil
+}
+
+// bookDoc is the Meilisearch document shape for a book.
+type bookDoc struct {
+	Slug          string   `json:"slug"`
+	Title         string   `json:"title"`
+	Author        string   `json:"author"`
+	Cover         string   `json:"cover"`
+	Status        string   `json:"status"`
+	Genres        []string `json:"genres"`
+	Summary       string   `json:"summary"`
+	TotalChapters int      `json:"total_chapters"`
+	SourceURL     string   `json:"source_url"`
+	Rank          int      `json:"rank"`
+	Rating        float64  `json:"rating"`
+}
+
+func toDoc(b domain.BookMeta) bookDoc {
+	return bookDoc{
+		Slug:          b.Slug,
+		Title:         b.Title,
+		Author:        b.Author,
+		Cover:         b.Cover,
+		Status:        b.Status,
+		Genres:        b.Genres,
+		Summary:       b.Summary,
+		TotalChapters: b.TotalChapters,
+		SourceURL:     b.SourceURL,
+		Rank:          b.Ranking,
+		Rating:        b.Rating,
+	}
+}
+
+func fromDoc(d bookDoc) domain.BookMeta {
+	return domain.BookMeta{
+		Slug:          d.Slug,
+		Title:         d.Title,
+		Author:        d.Author,
+		Cover:         d.Cover,
+		Status:        d.Status,
+		Genres:        d.Genres,
+		Summary:       d.Summary,
+		TotalChapters: d.TotalChapters,
+		SourceURL:     d.SourceURL,
+		Ranking:       d.Rank,
+		Rating:        d.Rating,
+	}
+}
+
+// UpsertBook adds or replaces the book document in Meilisearch. The operation
+// is fire-and-forget (Meilisearch processes tasks asynchronously).
+func (c *MeiliClient) UpsertBook(_ context.Context, book domain.BookMeta) error {
+	docs := []bookDoc{toDoc(book)}
+	pk := "slug"
+	if _, err := c.idx.AddDocuments(docs, &meilisearch.DocumentOptions{PrimaryKey: &pk}); err != nil {
+		return fmt.Errorf("meili: upsert book %q: %w", book.Slug, err)
+	}
+	return nil
+}
+
+// Search returns books matching query, up to limit results.
+func (c *MeiliClient) Search(_ context.Context, query string, limit int) ([]domain.BookMeta, error) {
+	if limit <= 0 {
+		limit = 20
+	}
+	res, err := c.idx.Search(query, &meilisearch.SearchRequest{
+		Limit: int64(limit),
+	})
+	if err != nil {
+		return nil, fmt.Errorf("meili: search %q: %w", query, err)
+	}
+
+	books := make([]domain.BookMeta, 0, len(res.Hits))
+	for _, hit := range res.Hits {
+		// Hit is map[string]json.RawMessage — unmarshal directly into bookDoc.
+		var doc bookDoc
+		raw, err := json.Marshal(hit)
+		if err != nil {
+			continue
+		}
+		if err := json.Unmarshal(raw, &doc); err != nil {
+			continue
+		}
+		books = append(books, fromDoc(doc))
+	}
+	return books, nil
+}
+
+// Catalogue queries books with optional full-text search, genre/status filters,
+// sort order, and pagination. Returns matching books and the total estimate.
+func (c *MeiliClient) Catalogue(_ context.Context, q CatalogueQuery) ([]domain.BookMeta, int64, error) {
+	if q.Limit <= 0 {
+		q.Limit = 20
+	}
+	if q.Page <= 0 {
+		q.Page = 1
+	}
+
+	req := &meilisearch.SearchRequest{
+		Limit:  int64(q.Limit),
+		Offset: int64((q.Page - 1) * q.Limit),
+	}
+
+	// Build filter
+	var filters []string
+	if q.Genre != "" && q.Genre != "all" {
+		filters = append(filters, fmt.Sprintf("genres = %q", q.Genre))
+	}
+	if q.Status != "" && q.Status != "all" {
+		filters = append(filters, fmt.Sprintf("status = %q", q.Status))
+	}
+	if len(filters) > 0 {
+		req.Filter = strings.Join(filters, " AND ")
+	}
+
+	// Map UI sort tokens to Meilisearch sort expressions
+	switch q.Sort {
+	case "rank":
+		req.Sort = []string{"rank:asc"}
+	case "top-rated":
+		req.Sort = []string{"rating:desc"}
+	case "new":
+		req.Sort = []string{"total_chapters:desc"}
+		// "popular" and "" → relevance (no explicit sort)
+	}
+
+	res, err := c.idx.Search(q.Q, req)
+	if err != nil {
+		return nil, 0, fmt.Errorf("meili: catalogue query: %w", err)
+	}
+
+	books := make([]domain.BookMeta, 0, len(res.Hits))
+	for _, hit := range res.Hits {
+		var doc bookDoc
+		raw, err := json.Marshal(hit)
+		if err != nil {
+			continue
+		}
+		if err := json.Unmarshal(raw, &doc); err != nil {
+			continue
+		}
+		books = append(books, fromDoc(doc))
+	}
+	return books, res.EstimatedTotalHits, nil
+}
+
+// NoopClient is a no-op Client used when Meilisearch is not configured.
+type NoopClient struct{}
+
+func (NoopClient) UpsertBook(_ context.Context, _ domain.BookMeta) error { return nil }
+func (NoopClient) Search(_ context.Context, _ string, _ int) ([]domain.BookMeta, error) {
+	return nil, nil
+}
+func (NoopClient) Catalogue(_ context.Context, _ CatalogueQuery) ([]domain.BookMeta, int64, error) {
+	return nil, 0, nil
+}

v3/backend/internal/novelfire/htmlutil/htmlutil.go

@@ -0,0 +1,228 @@
+// Package htmlutil provides helper functions for parsing HTML with
+// golang.org/x/net/html and extracting values by Selector descriptors.
+package htmlutil
+
+import (
+	"net/url"
+	"regexp"
+	"strings"
+
+	"github.com/libnovel/backend/internal/scraper"
+	"golang.org/x/net/html"
+)
+
+// ResolveURL returns an absolute URL. If href is already absolute it is
+// returned unchanged. Otherwise it is resolved against base.
+func ResolveURL(base, href string) string {
+	if strings.HasPrefix(href, "http://") || strings.HasPrefix(href, "https://") {
+		return href
+	}
+	b, err := url.Parse(base)
+	if err != nil {
+		return base + href
+	}
+	ref, err := url.Parse(href)
+	if err != nil {
+		return base + href
+	}
+	return b.ResolveReference(ref).String()
+}
+
+// ParseHTML parses raw HTML and returns the root node.
+func ParseHTML(raw string) (*html.Node, error) {
+	return html.Parse(strings.NewReader(raw))
+}
+
+// selectorMatches reports whether node n matches sel.
+func selectorMatches(n *html.Node, sel scraper.Selector) bool {
+	if n.Type != html.ElementNode {
+		return false
+	}
+	if sel.Tag != "" && n.Data != sel.Tag {
+		return false
+	}
+	if sel.ID != "" {
+		for _, a := range n.Attr {
+			if a.Key == "id" && a.Val == sel.ID {
+				goto checkClass
+			}
+		}
+		return false
+	}
+checkClass:
+	if sel.Class != "" {
+		for _, a := range n.Attr {
+			if a.Key == "class" {
+				for _, cls := range strings.Fields(a.Val) {
+					if cls == sel.Class {
+						goto matched
+					}
+				}
+			}
+		}
+		return false
+	}
+matched:
+	return true
+}
+
+// AttrVal returns the value of attribute key from node n.
+func AttrVal(n *html.Node, key string) string {
+	for _, a := range n.Attr {
+		if a.Key == key {
+			return a.Val
+		}
+	}
+	return ""
+}
+
+// TextContent returns the concatenated text content of all descendant text nodes.
+func TextContent(n *html.Node) string {
+	var sb strings.Builder
+	var walk func(*html.Node)
+	walk = func(cur *html.Node) {
+		if cur.Type == html.TextNode {
+			sb.WriteString(cur.Data)
+		}
+		for c := cur.FirstChild; c != nil; c = c.NextSibling {
+			walk(c)
+		}
+	}
+	walk(n)
+	return strings.TrimSpace(sb.String())
+}
+
+// FindFirst returns the first node matching sel within root.
+func FindFirst(root *html.Node, sel scraper.Selector) *html.Node {
+	var found *html.Node
+	var walk func(*html.Node) bool
+	walk = func(n *html.Node) bool {
+		if selectorMatches(n, sel) {
+			found = n
+			return true
+		}
+		for c := n.FirstChild; c != nil; c = c.NextSibling {
+			if walk(c) {
+				return true
+			}
+		}
+		return false
+	}
+	walk(root)
+	return found
+}
+
+// FindAll returns all nodes matching sel within root.
+func FindAll(root *html.Node, sel scraper.Selector) []*html.Node {
+	var results []*html.Node
+	var walk func(*html.Node)
+	walk = func(n *html.Node) {
+		if selectorMatches(n, sel) {
+			results = append(results, n)
+		}
+		for c := n.FirstChild; c != nil; c = c.NextSibling {
+			walk(c)
+		}
+	}
+	walk(root)
+	return results
+}
+
+// ExtractText extracts a string value from node n using sel.
+// If sel.Attr is set the attribute value is returned; otherwise the inner text.
+func ExtractText(n *html.Node, sel scraper.Selector) string {
+	if sel.Attr != "" {
+		return AttrVal(n, sel.Attr)
+	}
+	return TextContent(n)
+}
+
+// ExtractFirst locates the first match in root and returns its text/attr value.
+func ExtractFirst(root *html.Node, sel scraper.Selector) string {
+	n := FindFirst(root, sel)
+	if n == nil {
+		return ""
+	}
+	return ExtractText(n, sel)
+}
+
+// ExtractAll locates all matches in root and returns their text/attr values.
+func ExtractAll(root *html.Node, sel scraper.Selector) []string {
+	nodes := FindAll(root, sel)
+	out := make([]string, 0, len(nodes))
+	for _, n := range nodes {
+		if v := ExtractText(n, sel); v != "" {
+			out = append(out, v)
+		}
+	}
+	return out
+}
+
+// NodeToMarkdown converts the children of an HTML node to a plain-text/Markdown
+// representation suitable for chapter storage.
+func NodeToMarkdown(n *html.Node) string {
+	var sb strings.Builder
+	nodeToMD(n, &sb)
+	out := multiBlankLine.ReplaceAllString(sb.String(), "\n\n")
+	return strings.TrimSpace(out)
+}
+
+var multiBlankLine = regexp.MustCompile(`\n(\s*\n){2,}`)
+
+var blockElements = map[string]bool{
+	"p": true, "div": true, "br": true, "h1": true, "h2": true,
+	"h3": true, "h4": true, "h5": true, "h6": true, "li": true,
+	"blockquote": true, "pre": true, "hr": true,
+}
+
+func nodeToMD(n *html.Node, sb *strings.Builder) {
+	switch n.Type {
+	case html.TextNode:
+		sb.WriteString(n.Data)
+	case html.ElementNode:
+		tag := n.Data
+		switch tag {
+		case "br":
+			sb.WriteString("\n")
+		case "hr":
+			sb.WriteString("\n---\n")
+		case "h1", "h2", "h3", "h4", "h5", "h6":
+			level := int(tag[1] - '0')
+			sb.WriteString("\n" + strings.Repeat("#", level) + " ")
+			for c := n.FirstChild; c != nil; c = c.NextSibling {
+				nodeToMD(c, sb)
+			}
+			sb.WriteString("\n\n")
+			return
+		case "p", "div", "blockquote":
+			sb.WriteString("\n")
+			for c := n.FirstChild; c != nil; c = c.NextSibling {
+				nodeToMD(c, sb)
+			}
+			sb.WriteString("\n")
+			return
+		case "em", "i":
+			sb.WriteString("*")
+			for c := n.FirstChild; c != nil; c = c.NextSibling {
+				nodeToMD(c, sb)
+			}
+			sb.WriteString("*")
+			return
+		case "strong", "b":
+			sb.WriteString("**")
+			for c := n.FirstChild; c != nil; c = c.NextSibling {
+				nodeToMD(c, sb)
+			}
+			sb.WriteString("**")
+			return
+		case "script", "style", "noscript":
+			return // drop
+		}
+		for c := n.FirstChild; c != nil; c = c.NextSibling {
+			nodeToMD(c, sb)
+		}
+		if blockElements[tag] {
+			sb.WriteString("\n")
+		}
+	}
+}

v3/backend/internal/novelfire/scraper.go

@@ -0,0 +1,498 @@
+// Package novelfire provides a NovelScraper implementation for novelfire.net.
+//
+// Site structure (as of 2025):
+//
+//	Catalogue : https://novelfire.net/genre-all/sort-new/status-all/all-novel?page=N
+//	Book page : https://novelfire.net/book/{slug}
+//	Chapters  : https://novelfire.net/book/{slug}/chapters?page=N
+//	Chapter   : https://novelfire.net/book/{slug}/{chapter-slug}
+package novelfire
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"log/slog"
+	"net/url"
+	"path"
+	"strconv"
+	"strings"
+	"time"
+
+	"github.com/libnovel/backend/internal/browser"
+	"github.com/libnovel/backend/internal/domain"
+	"github.com/libnovel/backend/internal/novelfire/htmlutil"
+	"github.com/libnovel/backend/internal/scraper"
+	"golang.org/x/net/html"
+)
+
+const (
+	baseURL       = "https://novelfire.net"
+	cataloguePath = "/genre-all/sort-new/status-all/all-novel"
+	rankingPath   = "/genre-all/sort-popular/status-all/all-novel"
+)
+
+// Scraper is the novelfire.net implementation of scraper.NovelScraper.
+type Scraper struct {
+	client browser.Client
+	log    *slog.Logger
+}
+
+// Compile-time interface check.
+var _ scraper.NovelScraper = (*Scraper)(nil)
+
+// New returns a new novelfire Scraper backed by client.
+func New(client browser.Client, log *slog.Logger) *Scraper {
+	if log == nil {
+		log = slog.Default()
+	}
+	return &Scraper{client: client, log: log}
+}
+
+// SourceName implements NovelScraper.
+func (s *Scraper) SourceName() string { return "novelfire.net" }
+
+// ── CatalogueProvider ─────────────────────────────────────────────────────────
+
+// ScrapeCatalogue streams all CatalogueEntry values across all catalogue pages.
+func (s *Scraper) ScrapeCatalogue(ctx context.Context) (<-chan domain.CatalogueEntry, <-chan error) {
+	entries := make(chan domain.CatalogueEntry, 64)
+	errs := make(chan error, 16)
+
+	go func() {
+		defer close(entries)
+		defer close(errs)
+
+		pageURL := baseURL + cataloguePath
+		page := 1
+
+		for pageURL != "" {
+			select {
+			case <-ctx.Done():
+				return
+			default:
+			}
+
+			s.log.Info("scraping catalogue page", "page", page, "url", pageURL)
+			raw, err := s.client.GetContent(ctx, pageURL)
+			if err != nil {
+				errs <- fmt.Errorf("catalogue page %d: %w", page, err)
+				return
+			}
+
+			root, err := htmlutil.ParseHTML(raw)
+			if err != nil {
+				errs <- fmt.Errorf("catalogue page %d parse: %w", page, err)
+				return
+			}
+
+			cards := htmlutil.FindAll(root, scraper.Selector{Tag: "li", Class: "novel-item", Multiple: true})
+			if len(cards) == 0 {
+				s.log.Warn("no novel cards found, stopping pagination", "page", page)
+				return
+			}
+
+			for _, card := range cards {
+				linkNode := htmlutil.FindFirst(card, scraper.Selector{Tag: "a", Attr: "href"})
+				titleNode := htmlutil.FindFirst(card, scraper.Selector{Tag: "h4", Class: "novel-title"})
+
+				var title, href string
+				if linkNode != nil {
+					href = htmlutil.ExtractText(linkNode, scraper.Selector{Tag: "a", Attr: "href"})
+				}
+				if titleNode != nil {
+					title = strings.TrimSpace(htmlutil.ExtractText(titleNode, scraper.Selector{}))
+				}
+				if href == "" || title == "" {
+					continue
+				}
+
+				bookURL := resolveURL(baseURL, href)
+				select {
+				case <-ctx.Done():
+					return
+				case entries <- domain.CatalogueEntry{Title: title, URL: bookURL}:
+				}
+			}
+
+			if !hasNextPageLink(root) {
+				break
+			}
+			nextHref := ""
+			for _, a := range htmlutil.FindAll(root, scraper.Selector{Tag: "a", Multiple: true}) {
+				if htmlutil.AttrVal(a, "rel") == "next" {
+					nextHref = htmlutil.AttrVal(a, "href")
+					break
+				}
+			}
+			if nextHref == "" {
+				break
+			}
+			pageURL = resolveURL(baseURL, nextHref)
+			page++
+		}
+	}()
+
+	return entries, errs
+}
+
+// ── MetadataProvider ──────────────────────────────────────────────────────────
+
+// ScrapeMetadata fetches and parses book metadata from the book's landing page.
+func (s *Scraper) ScrapeMetadata(ctx context.Context, bookURL string) (domain.BookMeta, error) {
+	s.log.Debug("metadata fetch starting", "url", bookURL)
+
+	raw, err := s.client.GetContent(ctx, bookURL)
+	if err != nil {
+		return domain.BookMeta{}, fmt.Errorf("metadata fetch %s: %w", bookURL, err)
+	}
+
+	root, err := htmlutil.ParseHTML(raw)
+	if err != nil {
+		return domain.BookMeta{}, fmt.Errorf("metadata parse %s: %w", bookURL, err)
+	}
+
+	title := htmlutil.ExtractFirst(root, scraper.Selector{Tag: "h1", Class: "novel-title"})
+	author := htmlutil.ExtractFirst(root, scraper.Selector{Tag: "span", Class: "author"})
+
+	var cover string
+	if fig := htmlutil.FindFirst(root, scraper.Selector{Tag: "figure", Class: "cover"}); fig != nil {
+		cover = htmlutil.ExtractFirst(fig, scraper.Selector{Tag: "img", Attr: "src"})
+		if cover != "" && !strings.HasPrefix(cover, "http") {
+			cover = baseURL + cover
+		}
+	}
+
+	status := htmlutil.ExtractFirst(root, scraper.Selector{Tag: "span", Class: "status"})
+
+	genresNode := htmlutil.FindFirst(root, scraper.Selector{Tag: "div", Class: "genres"})
+	var genres []string
+	if genresNode != nil {
+		genres = htmlutil.ExtractAll(genresNode, scraper.Selector{Tag: "a", Multiple: true})
+	}
+
+	summary := htmlutil.ExtractFirst(root, scraper.Selector{Tag: "div", Class: "summary"})
+	totalStr := htmlutil.ExtractFirst(root, scraper.Selector{Tag: "span", Class: "chapter-count"})
+	totalChapters := parseChapterCount(totalStr)
+
+	slug := slugFromURL(bookURL)
+
+	meta := domain.BookMeta{
+		Slug:          slug,
+		Title:         title,
+		Author:        author,
+		Cover:         cover,
+		Status:        status,
+		Genres:        genres,
+		Summary:       summary,
+		TotalChapters: totalChapters,
+		SourceURL:     bookURL,
+	}
+	s.log.Debug("metadata parsed", "slug", meta.Slug, "title", meta.Title)
+	return meta, nil
+}
+
+// ── ChapterListProvider ───────────────────────────────────────────────────────
+
+// ScrapeChapterList returns all chapter references for a book, ordered ascending.
+func (s *Scraper) ScrapeChapterList(ctx context.Context, bookURL string) ([]domain.ChapterRef, error) {
+	var refs []domain.ChapterRef
+	baseChapterURL := strings.TrimRight(bookURL, "/") + "/chapters"
+	page := 1
+
+	for {
+		select {
+		case <-ctx.Done():
+			return refs, ctx.Err()
+		default:
+		}
+
+		pageURL := fmt.Sprintf("%s?page=%d", baseChapterURL, page)
+		s.log.Info("scraping chapter list", "page", page, "url", pageURL)
+
+		raw, err := s.client.GetContent(ctx, pageURL)
+		if err != nil {
+			return refs, fmt.Errorf("chapter list page %d: %w", page, err)
+		}
+
+		root, err := htmlutil.ParseHTML(raw)
+		if err != nil {
+			return refs, fmt.Errorf("chapter list page %d parse: %w", page, err)
+		}
+
+		chapterList := htmlutil.FindFirst(root, scraper.Selector{Class: "chapter-list"})
+		if chapterList == nil {
+			s.log.Debug("chapter list container not found, stopping pagination", "page", page)
+			break
+		}
+
+		items := htmlutil.FindAll(chapterList, scraper.Selector{Tag: "li"})
+		if len(items) == 0 {
+			break
+		}
+
+		for _, item := range items {
+			linkNode := htmlutil.FindFirst(item, scraper.Selector{Tag: "a"})
+			if linkNode == nil {
+				continue
+			}
+			href := htmlutil.ExtractText(linkNode, scraper.Selector{Attr: "href"})
+			chTitle := htmlutil.ExtractText(linkNode, scraper.Selector{})
+			if href == "" {
+				continue
+			}
+			chURL := resolveURL(baseURL, href)
+			num := chapterNumberFromURL(chURL)
+			if num <= 0 {
+				num = len(refs) + 1
+				s.log.Warn("chapter number not parseable from URL, falling back to position",
+					"url", chURL, "position", num)
+			}
+			refs = append(refs, domain.ChapterRef{
+				Number: num,
+				Title:  strings.TrimSpace(chTitle),
+				URL:    chURL,
+			})
+		}
+
+		page++
+	}
+
+	return refs, nil
+}
+
+// ── ChapterTextProvider ───────────────────────────────────────────────────────
+
+// ScrapeChapterText fetches and parses a single chapter page.
+func (s *Scraper) ScrapeChapterText(ctx context.Context, ref domain.ChapterRef) (domain.Chapter, error) {
+	s.log.Debug("chapter text fetch starting", "chapter", ref.Number, "url", ref.URL)
+
+	raw, err := retryGet(ctx, s.log, s.client, ref.URL, 9, 6*time.Second)
+	if err != nil {
+		return domain.Chapter{}, fmt.Errorf("chapter %d fetch: %w", ref.Number, err)
+	}
+
+	root, err := htmlutil.ParseHTML(raw)
+	if err != nil {
+		return domain.Chapter{}, fmt.Errorf("chapter %d parse: %w", ref.Number, err)
+	}
+
+	container := htmlutil.FindFirst(root, scraper.Selector{ID: "content"})
+	if container == nil {
+		return domain.Chapter{}, fmt.Errorf("chapter %d: #content container not found in %s", ref.Number, ref.URL)
+	}
+
+	text := htmlutil.NodeToMarkdown(container)
+
+	s.log.Debug("chapter text parsed", "chapter", ref.Number, "text_bytes", len(text))
+
+	return domain.Chapter{Ref: ref, Text: text}, nil
+}
+
+// ── RankingProvider ───────────────────────────────────────────────────────────
+
+// ScrapeRanking pages through up to maxPages pages of the popular-novels listing.
+// maxPages <= 0 means all pages. The caller decides whether to persist items.
+func (s *Scraper) ScrapeRanking(ctx context.Context, maxPages int) (<-chan domain.BookMeta, <-chan error) {
+	entries := make(chan domain.BookMeta, 32)
+	errs := make(chan error, 16)
+
+	go func() {
+		defer close(entries)
+		defer close(errs)
+
+		rank := 1
+
+		for page := 1; maxPages <= 0 || page <= maxPages; page++ {
+			select {
+			case <-ctx.Done():
+				return
+			default:
+			}
+
+			pageURL := fmt.Sprintf("%s%s?page=%d", baseURL, rankingPath, page)
+			s.log.Info("scraping popular ranking page", "page", page, "url", pageURL)
+
+			raw, err := s.client.GetContent(ctx, pageURL)
+			if err != nil {
+				errs <- fmt.Errorf("ranking page %d: %w", page, err)
+				return
+			}
+
+			root, err := htmlutil.ParseHTML(raw)
+			if err != nil {
+				errs <- fmt.Errorf("ranking page %d parse: %w", page, err)
+				return
+			}
+
+			cards := htmlutil.FindAll(root, scraper.Selector{Tag: "li", Class: "novel-item", Multiple: true})
+			if len(cards) == 0 {
+				break
+			}
+
+			for _, card := range cards {
+				linkNode := htmlutil.FindFirst(card, scraper.Selector{Tag: "a"})
+				if linkNode == nil {
+					continue
+				}
+				href := htmlutil.ExtractText(linkNode, scraper.Selector{Tag: "a", Attr: "href"})
+				bookURL := resolveURL(baseURL, href)
+				if bookURL == "" {
+					continue
+				}
+
+				title := strings.TrimSpace(htmlutil.ExtractFirst(card, scraper.Selector{Tag: "h4", Class: "novel-title"}))
+				if title == "" {
+					title = strings.TrimSpace(htmlutil.ExtractText(linkNode, scraper.Selector{Tag: "a", Attr: "title"}))
+				}
+				if title == "" {
+					continue
+				}
+
+				var cover string
+				if fig := htmlutil.FindFirst(card, scraper.Selector{Tag: "figure", Class: "novel-cover"}); fig != nil {
+					cover = htmlutil.ExtractFirst(fig, scraper.Selector{Tag: "img", Attr: "data-src"})
+					if cover == "" {
+						cover = htmlutil.ExtractFirst(fig, scraper.Selector{Tag: "img", Attr: "src"})
+					}
+					if strings.HasPrefix(cover, "data:") {
+						cover = ""
+					}
+					if cover != "" && !strings.HasPrefix(cover, "http") {
+						cover = baseURL + cover
+					}
+				}
+
+				meta := domain.BookMeta{
+					Slug:      slugFromURL(bookURL),
+					Title:     title,
+					Cover:     cover,
+					SourceURL: bookURL,
+					Ranking:   rank,
+				}
+				rank++
+
+				select {
+				case <-ctx.Done():
+					return
+				case entries <- meta:
+				}
+			}
+
+			if !hasNextPageLink(root) {
+				break
+			}
+		}
+	}()
+
+	return entries, errs
+}
+
+// ── helpers ───────────────────────────────────────────────────────────────────
+
+func resolveURL(base, href string) string { return htmlutil.ResolveURL(base, href) }
+
+func hasNextPageLink(root *html.Node) bool {
+	links := htmlutil.FindAll(root, scraper.Selector{Tag: "a", Multiple: true})
+	for _, a := range links {
+		for _, attr := range a.Attr {
+			if attr.Key == "rel" && attr.Val == "next" {
+				return true
+			}
+		}
+	}
+	return false
+}
+
+func slugFromURL(bookURL string) string {
+	u, err := url.Parse(bookURL)
+	if err != nil {
+		return bookURL
+	}
+	parts := strings.Split(strings.Trim(u.Path, "/"), "/")
+	if len(parts) >= 2 && parts[0] == "book" {
+		return parts[1]
+	}
+	if len(parts) > 0 {
+		return parts[len(parts)-1]
+	}
+	return ""
+}
+
+func parseChapterCount(s string) int {
+	s = strings.ReplaceAll(s, ",", "")
+	fields := strings.Fields(s)
+	if len(fields) == 0 {
+		return 0
+	}
+	n, _ := strconv.Atoi(fields[0])
+	return n
+}
+
+func chapterNumberFromURL(chapterURL string) int {
+	u, err := url.Parse(chapterURL)
+	if err != nil {
+		return 0
+	}
+	seg := path.Base(u.Path)
+	seg = strings.TrimPrefix(seg, "chapter-")
+	seg = strings.TrimPrefix(seg, "chap-")
+	seg = strings.TrimPrefix(seg, "ch-")
+	digits := strings.FieldsFunc(seg, func(r rune) bool {
+		return r < '0' || r > '9'
+	})
+	if len(digits) == 0 {
+		return 0
+	}
+	n, _ := strconv.Atoi(digits[0])
+	return n
+}
+
+// retryGet calls client.GetContent up to maxAttempts times with exponential backoff.
+// If the server returns 429 (ErrRateLimit), the suggested Retry-After delay is used
+// instead of the geometric backoff delay.
+func retryGet(
+	ctx context.Context,
+	log *slog.Logger,
+	client browser.Client,
+	pageURL string,
+	maxAttempts int,
+	baseDelay time.Duration,
+) (string, error) {
+	var lastErr error
+	delay := baseDelay
+	for attempt := 1; attempt <= maxAttempts; attempt++ {
+		raw, err := client.GetContent(ctx, pageURL)
+		if err == nil {
+			return raw, nil
+		}
+		lastErr = err
+		if ctx.Err() != nil {
+			return "", err
+		}
+		if attempt < maxAttempts {
+			// If the server is rate-limiting us, honour its Retry-After delay.
+			waitFor := delay
+			var rlErr *browser.RateLimitError
+			if errors.As(err, &rlErr) {
+				waitFor = rlErr.RetryAfter
+				if log != nil {
+					log.Warn("rate limited, backing off",
+						"url", pageURL, "attempt", attempt, "retry_in", waitFor)
+				}
+			} else {
+				if log != nil {
+					log.Warn("fetch failed, retrying",
+						"url", pageURL, "attempt", attempt, "retry_in", delay, "err", err)
+				}
+				delay *= 2
+			}
+			select {
+			case <-ctx.Done():
+				return "", ctx.Err()
+			case <-time.After(waitFor):
+			}
+		}
+	}
+	return "", lastErr
+}

v3/backend/internal/novelfire/scraper_test.go

@@ -0,0 +1,129 @@
+package novelfire
+
+import (
+	"context"
+	"testing"
+)
+
+func TestSlugFromURL(t *testing.T) {
+	cases := []struct {
+		url  string
+		want string
+	}{
+		{"https://novelfire.net/book/shadow-slave", "shadow-slave"},
+		{"https://novelfire.net/book/a-dragon-against-the-whole-world", "a-dragon-against-the-whole-world"},
+		{"https://novelfire.net/book/foo/chapter-1", "foo"},
+		{"https://novelfire.net/", ""},
+		{"not-a-url", "not-a-url"},
+	}
+	for _, c := range cases {
+		got := slugFromURL(c.url)
+		if got != c.want {
+			t.Errorf("slugFromURL(%q) = %q, want %q", c.url, got, c.want)
+		}
+	}
+}
+
+func TestChapterNumberFromURL(t *testing.T) {
+	cases := []struct {
+		url  string
+		want int
+	}{
+		{"https://novelfire.net/book/shadow-slave/chapter-42", 42},
+		{"https://novelfire.net/book/shadow-slave/chapter-1000", 1000},
+		{"https://novelfire.net/book/shadow-slave/chap-7", 7},
+		{"https://novelfire.net/book/shadow-slave/ch-3", 3},
+		{"https://novelfire.net/book/shadow-slave/42", 42},
+		{"https://novelfire.net/book/shadow-slave/no-number-here", 0},
+		{"not-a-url", 0},
+	}
+	for _, c := range cases {
+		got := chapterNumberFromURL(c.url)
+		if got != c.want {
+			t.Errorf("chapterNumberFromURL(%q) = %d, want %d", c.url, got, c.want)
+		}
+	}
+}
+
+func TestParseChapterCount(t *testing.T) {
+	cases := []struct {
+		in   string
+		want int
+	}{
+		{"123 Chapters", 123},
+		{"1,234 Chapters", 1234},
+		{"0", 0},
+		{"", 0},
+		{"500", 500},
+	}
+	for _, c := range cases {
+		got := parseChapterCount(c.in)
+		if got != c.want {
+			t.Errorf("parseChapterCount(%q) = %d, want %d", c.in, got, c.want)
+		}
+	}
+}
+
+func TestRetryGet_ContextCancellation(t *testing.T) {
+	ctx, cancel := context.WithCancel(context.Background())
+	cancel() // cancel immediately
+
+	stub := newStubClient()
+	stub.setError("https://example.com/page", context.Canceled)
+
+	_, err := retryGet(ctx, nil, stub, "https://example.com/page", 3, 0)
+	if err == nil {
+		t.Fatal("expected error on cancelled context")
+	}
+}
+
+func TestRetryGet_EventualSuccess(t *testing.T) {
+	stub := newStubClient()
+	calls := 0
+	stub.setFn("https://example.com/page", func() (string, error) {
+		calls++
+		if calls < 3 {
+			return "", context.DeadlineExceeded
+		}
+		return "<html>ok</html>", nil
+	})
+
+	got, err := retryGet(context.Background(), nil, stub, "https://example.com/page", 5, 0)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if got != "<html>ok</html>" {
+		t.Errorf("got %q, want html", got)
+	}
+	if calls != 3 {
+		t.Errorf("expected 3 calls, got %d", calls)
+	}
+}
+
+// ── minimal stub client for tests ─────────────────────────────────────────────
+
+type stubClient struct {
+	errors map[string]error
+	fns    map[string]func() (string, error)
+}
+
+func newStubClient() *stubClient {
+	return &stubClient{
+		errors: make(map[string]error),
+		fns:    make(map[string]func() (string, error)),
+	}
+}
+
+func (s *stubClient) setError(u string, err error) { s.errors[u] = err }
+
+func (s *stubClient) setFn(u string, fn func() (string, error)) { s.fns[u] = fn }
+
+func (s *stubClient) GetContent(_ context.Context, pageURL string) (string, error) {
+	if fn, ok := s.fns[pageURL]; ok {
+		return fn()
+	}
+	if err, ok := s.errors[pageURL]; ok {
+		return "", err
+	}
+	return "", context.DeadlineExceeded
+}

v3/backend/internal/orchestrator/orchestrator.go

@@ -0,0 +1,222 @@
+// Package orchestrator coordinates metadata extraction, chapter-list fetching,
+// and parallel chapter scraping for a single book.
+//
+// Design:
+//   - RunBook scrapes one book (metadata + chapter list + chapter texts) end-to-end.
+//   - N worker goroutines pull chapter refs from a shared queue and call ScrapeChapterText.
+//   - The caller (runner poll loop) owns the outer task-claim / finish cycle.
+//   - An optional PostMetadata hook (set in Config) is called after WriteMetadata
+//     succeeds. The runner uses this to upsert books into Meilisearch.
+package orchestrator
+
+import (
+	"context"
+	"fmt"
+	"log/slog"
+	"runtime"
+	"sync"
+	"sync/atomic"
+
+	"github.com/libnovel/backend/internal/bookstore"
+	"github.com/libnovel/backend/internal/domain"
+	"github.com/libnovel/backend/internal/scraper"
+)
+
+// Config holds tunable parameters for the orchestrator.
+type Config struct {
+	// Workers is the number of goroutines used to scrape chapters in parallel.
+	// Defaults to runtime.NumCPU() when 0.
+	Workers int
+	// PostMetadata is an optional hook called with the scraped BookMeta after
+	// WriteMetadata succeeds. Errors from the hook are logged but not fatal.
+	// Used by the runner to index books in Meilisearch.
+	PostMetadata func(ctx context.Context, meta domain.BookMeta)
+}
+
+// Orchestrator runs a single-book scrape pipeline.
+type Orchestrator struct {
+	novel        scraper.NovelScraper
+	store        bookstore.BookWriter
+	log          *slog.Logger
+	workers      int
+	postMetadata func(ctx context.Context, meta domain.BookMeta)
+}
+
+// New returns a new Orchestrator.
+func New(cfg Config, novel scraper.NovelScraper, store bookstore.BookWriter, log *slog.Logger) *Orchestrator {
+	if log == nil {
+		log = slog.Default()
+	}
+	workers := cfg.Workers
+	if workers <= 0 {
+		workers = runtime.NumCPU()
+	}
+	return &Orchestrator{
+		novel:        novel,
+		store:        store,
+		log:          log,
+		workers:      workers,
+		postMetadata: cfg.PostMetadata,
+	}
+}
+
+// RunBook scrapes a single book described by task. It handles:
+//  1. Metadata scrape + write
+//  2. Chapter list scrape + write
+//  3. Parallel chapter text scrape + write (worker pool)
+//
+// Returns a ScrapeResult with counters. The result's ErrorMessage is non-empty
+// if the run failed at the metadata or chapter-list level.
+func (o *Orchestrator) RunBook(ctx context.Context, task domain.ScrapeTask) domain.ScrapeResult {
+	o.log.Info("orchestrator: RunBook starting",
+		"task_id", task.ID,
+		"kind", task.Kind,
+		"url", task.TargetURL,
+		"workers", o.workers,
+	)
+
+	var result domain.ScrapeResult
+
+	if task.TargetURL == "" {
+		result.ErrorMessage = "task has no target URL"
+		return result
+	}
+
+	// ── Step 1: Metadata ──────────────────────────────────────────────────────
+	meta, err := o.novel.ScrapeMetadata(ctx, task.TargetURL)
+	if err != nil {
+		o.log.Error("metadata scrape failed", "url", task.TargetURL, "err", err)
+		result.ErrorMessage = fmt.Sprintf("metadata: %v", err)
+		result.Errors++
+		return result
+	}
+
+	if err := o.store.WriteMetadata(ctx, meta); err != nil {
+		o.log.Error("metadata write failed", "slug", meta.Slug, "err", err)
+		// non-fatal: continue to chapters
+		result.Errors++
+	} else {
+		result.BooksFound = 1
+		// Fire optional post-metadata hook (e.g. Meilisearch indexing).
+		if o.postMetadata != nil {
+			o.postMetadata(ctx, meta)
+		}
+	}
+
+	o.log.Info("metadata saved", "slug", meta.Slug, "title", meta.Title)
+
+	// ── Step 2: Chapter list ──────────────────────────────────────────────────
+	refs, err := o.novel.ScrapeChapterList(ctx, task.TargetURL)
+	if err != nil {
+		o.log.Error("chapter list scrape failed", "slug", meta.Slug, "err", err)
+		result.ErrorMessage = fmt.Sprintf("chapter list: %v", err)
+		result.Errors++
+		return result
+	}
+
+	o.log.Info("chapter list fetched", "slug", meta.Slug, "chapters", len(refs))
+
+	// Persist chapter refs (without text) so the index exists early.
+	if wErr := o.store.WriteChapterRefs(ctx, meta.Slug, refs); wErr != nil {
+		o.log.Warn("chapter refs write failed", "slug", meta.Slug, "err", wErr)
+	}
+
+	// ── Step 3: Chapter texts (worker pool) ───────────────────────────────────
+	type chapterJob struct {
+		slug  string
+		ref   domain.ChapterRef
+		total int // total chapters to scrape (for progress logging)
+	}
+	work := make(chan chapterJob, o.workers*4)
+
+	var scraped, skipped, errors atomic.Int64
+	var wg sync.WaitGroup
+
+	for i := 0; i < o.workers; i++ {
+		wg.Add(1)
+		go func(workerID int) {
+			defer wg.Done()
+			for job := range work {
+				select {
+				case <-ctx.Done():
+					return
+				default:
+				}
+
+				if o.store.ChapterExists(ctx, job.slug, job.ref) {
+					o.log.Debug("chapter already exists, skipping",
+						"slug", job.slug, "chapter", job.ref.Number)
+					skipped.Add(1)
+					continue
+				}
+
+				ch, err := o.novel.ScrapeChapterText(ctx, job.ref)
+				if err != nil {
+					o.log.Error("chapter scrape failed",
+						"slug", job.slug, "chapter", job.ref.Number, "err", err)
+					errors.Add(1)
+					continue
+				}
+
+				if err := o.store.WriteChapter(ctx, job.slug, ch); err != nil {
+					o.log.Error("chapter write failed",
+						"slug", job.slug, "chapter", job.ref.Number, "err", err)
+					errors.Add(1)
+					continue
+				}
+
+				n := scraped.Add(1)
+				// Log a progress summary every 25 chapters scraped.
+				if n%25 == 0 {
+					o.log.Info("scraping chapters",
+						"slug", job.slug, "scraped", n, "total", job.total)
+				}
+			}
+		}(i)
+	}
+
+	// Count how many chapters will actually be enqueued (for progress logging).
+	toScrape := 0
+	for _, ref := range refs {
+		if task.FromChapter > 0 && ref.Number < task.FromChapter {
+			continue
+		}
+		if task.ToChapter > 0 && ref.Number > task.ToChapter {
+			continue
+		}
+		toScrape++
+	}
+
+	// Enqueue chapter jobs respecting the optional range filter from the task.
+	for _, ref := range refs {
+		if task.FromChapter > 0 && ref.Number < task.FromChapter {
+			skipped.Add(1)
+			continue
+		}
+		if task.ToChapter > 0 && ref.Number > task.ToChapter {
+			skipped.Add(1)
+			continue
+		}
+		select {
+		case <-ctx.Done():
+			goto drain
+		case work <- chapterJob{slug: meta.Slug, ref: ref, total: toScrape}:
+		}
+	}
+
+drain:
+	close(work)
+	wg.Wait()
+
+	result.ChaptersScraped = int(scraped.Load())
+	result.ChaptersSkipped = int(skipped.Load())
+	result.Errors += int(errors.Load())
+
+	o.log.Info("book scrape finished",
+		"slug", meta.Slug,
+		"scraped", result.ChaptersScraped,
+		"skipped", result.ChaptersSkipped,
+		"errors", result.Errors,
+	)
+	return result
+}

v3/backend/internal/orchestrator/orchestrator_test.go

@@ -0,0 +1,210 @@
+package orchestrator
+
+import (
+	"context"
+	"errors"
+	"sync"
+	"testing"
+
+	"github.com/libnovel/backend/internal/domain"
+)
+
+// ── stubs ─────────────────────────────────────────────────────────────────────
+
+type stubScraper struct {
+	meta     domain.BookMeta
+	metaErr  error
+	refs     []domain.ChapterRef
+	refsErr  error
+	chapters map[int]domain.Chapter
+	chapErr  map[int]error
+}
+
+func (s *stubScraper) SourceName() string { return "stub" }
+
+func (s *stubScraper) ScrapeCatalogue(ctx context.Context) (<-chan domain.CatalogueEntry, <-chan error) {
+	ch := make(chan domain.CatalogueEntry)
+	errs := make(chan error)
+	close(ch)
+	close(errs)
+	return ch, errs
+}
+
+func (s *stubScraper) ScrapeMetadata(_ context.Context, _ string) (domain.BookMeta, error) {
+	return s.meta, s.metaErr
+}
+
+func (s *stubScraper) ScrapeChapterList(_ context.Context, _ string) ([]domain.ChapterRef, error) {
+	return s.refs, s.refsErr
+}
+
+func (s *stubScraper) ScrapeChapterText(_ context.Context, ref domain.ChapterRef) (domain.Chapter, error) {
+	if s.chapErr != nil {
+		if err, ok := s.chapErr[ref.Number]; ok {
+			return domain.Chapter{}, err
+		}
+	}
+	if s.chapters != nil {
+		if ch, ok := s.chapters[ref.Number]; ok {
+			return ch, nil
+		}
+	}
+	return domain.Chapter{Ref: ref, Text: "text"}, nil
+}
+
+func (s *stubScraper) ScrapeRanking(ctx context.Context, maxPages int) (<-chan domain.BookMeta, <-chan error) {
+	ch := make(chan domain.BookMeta)
+	errs := make(chan error)
+	close(ch)
+	close(errs)
+	return ch, errs
+}
+
+type stubStore struct {
+	mu              sync.Mutex
+	metaWritten     []domain.BookMeta
+	chaptersWritten []domain.Chapter
+	existing        map[string]bool // "slug:N" → exists
+	writeMetaErr    error
+}
+
+func (s *stubStore) WriteMetadata(_ context.Context, meta domain.BookMeta) error {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	if s.writeMetaErr != nil {
+		return s.writeMetaErr
+	}
+	s.metaWritten = append(s.metaWritten, meta)
+	return nil
+}
+
+func (s *stubStore) WriteChapter(_ context.Context, slug string, ch domain.Chapter) error {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	s.chaptersWritten = append(s.chaptersWritten, ch)
+	return nil
+}
+
+func (s *stubStore) WriteChapterRefs(_ context.Context, _ string, _ []domain.ChapterRef) error {
+	return nil
+}
+
+func (s *stubStore) ChapterExists(_ context.Context, slug string, ref domain.ChapterRef) bool {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	key := slug + ":" + string(rune('0'+ref.Number))
+	return s.existing[key]
+}
+
+// ── tests ──────────────────────────────────────────────────────────────────────
+
+func TestRunBook_HappyPath(t *testing.T) {
+	sc := &stubScraper{
+		meta: domain.BookMeta{Slug: "test-book", Title: "Test Book", SourceURL: "https://example.com/book/test-book"},
+		refs: []domain.ChapterRef{
+			{Number: 1, Title: "Ch 1", URL: "https://example.com/book/test-book/chapter-1"},
+			{Number: 2, Title: "Ch 2", URL: "https://example.com/book/test-book/chapter-2"},
+			{Number: 3, Title: "Ch 3", URL: "https://example.com/book/test-book/chapter-3"},
+		},
+	}
+	st := &stubStore{}
+	o := New(Config{Workers: 2}, sc, st, nil)
+
+	task := domain.ScrapeTask{
+		ID:        "t1",
+		Kind:      "book",
+		TargetURL: "https://example.com/book/test-book",
+	}
+
+	result := o.RunBook(context.Background(), task)
+
+	if result.ErrorMessage != "" {
+		t.Fatalf("unexpected error: %s", result.ErrorMessage)
+	}
+	if result.BooksFound != 1 {
+		t.Errorf("BooksFound = %d, want 1", result.BooksFound)
+	}
+	if result.ChaptersScraped != 3 {
+		t.Errorf("ChaptersScraped = %d, want 3", result.ChaptersScraped)
+	}
+}
+
+func TestRunBook_MetadataError(t *testing.T) {
+	sc := &stubScraper{metaErr: errors.New("404 not found")}
+	st := &stubStore{}
+	o := New(Config{Workers: 1}, sc, st, nil)
+
+	result := o.RunBook(context.Background(), domain.ScrapeTask{
+		ID:        "t2",
+		TargetURL: "https://example.com/book/missing",
+	})
+
+	if result.ErrorMessage == "" {
+		t.Fatal("expected ErrorMessage to be set")
+	}
+	if result.Errors != 1 {
+		t.Errorf("Errors = %d, want 1", result.Errors)
+	}
+}
+
+func TestRunBook_ChapterRange(t *testing.T) {
+	sc := &stubScraper{
+		meta: domain.BookMeta{Slug: "range-book", SourceURL: "https://example.com/book/range-book"},
+		refs: func() []domain.ChapterRef {
+			var refs []domain.ChapterRef
+			for i := 1; i <= 10; i++ {
+				refs = append(refs, domain.ChapterRef{Number: i, URL: "https://example.com/book/range-book/chapter-" + string(rune('0'+i))})
+			}
+			return refs
+		}(),
+	}
+	st := &stubStore{}
+	o := New(Config{Workers: 2}, sc, st, nil)
+
+	result := o.RunBook(context.Background(), domain.ScrapeTask{
+		ID:          "t3",
+		TargetURL:   "https://example.com/book/range-book",
+		FromChapter: 3,
+		ToChapter:   7,
+	})
+
+	if result.ErrorMessage != "" {
+		t.Fatalf("unexpected error: %s", result.ErrorMessage)
+	}
+	// chapters 3–7 = 5 scraped, chapters 1-2 and 8-10 = 5 skipped
+	if result.ChaptersScraped != 5 {
+		t.Errorf("ChaptersScraped = %d, want 5", result.ChaptersScraped)
+	}
+	if result.ChaptersSkipped != 5 {
+		t.Errorf("ChaptersSkipped = %d, want 5", result.ChaptersSkipped)
+	}
+}
+
+func TestRunBook_ContextCancellation(t *testing.T) {
+	ctx, cancel := context.WithCancel(context.Background())
+	cancel()
+
+	sc := &stubScraper{
+		meta: domain.BookMeta{Slug: "ctx-book", SourceURL: "https://example.com/book/ctx-book"},
+		refs: []domain.ChapterRef{
+			{Number: 1, URL: "https://example.com/book/ctx-book/chapter-1"},
+		},
+	}
+	st := &stubStore{}
+	o := New(Config{Workers: 1}, sc, st, nil)
+
+	// Should not panic; result may have errors or zero chapters.
+	result := o.RunBook(ctx, domain.ScrapeTask{
+		ID:        "t4",
+		TargetURL: "https://example.com/book/ctx-book",
+	})
+	_ = result
+}
+
+func TestRunBook_EmptyTargetURL(t *testing.T) {
+	o := New(Config{Workers: 1}, &stubScraper{}, &stubStore{}, nil)
+	result := o.RunBook(context.Background(), domain.ScrapeTask{ID: "t5"})
+	if result.ErrorMessage == "" {
+		t.Fatal("expected ErrorMessage for empty target URL")
+	}
+}

v3/backend/internal/presigncache/cache.go

@@ -0,0 +1,96 @@
+// Package presigncache provides a Valkey (Redis-compatible) backed cache for
+// MinIO presigned URLs. The backend generates presigned URLs and stores them
+// here with a TTL; subsequent requests for the same key return the cached URL
+// without re-contacting MinIO.
+//
+// Design:
+//   - Cache is intentionally best-effort: Get returns ("", false, nil) on any
+//     Valkey error, so callers always have a fallback path to regenerate.
+//   - Set silently drops errors — a miss on the next request is acceptable.
+//   - TTL should be set shorter than the actual presigned URL lifetime so that
+//     cached URLs are always valid when served. Recommended: 55 minutes for a
+//     1-hour presigned URL.
+package presigncache
+
+import (
+	"context"
+	"fmt"
+	"time"
+
+	"github.com/redis/go-redis/v9"
+)
+
+// Cache is the interface for presign URL caching.
+// Implementations must be safe for concurrent use.
+type Cache interface {
+	// Get returns the cached URL for key. ok is false on cache miss or error.
+	Get(ctx context.Context, key string) (url string, ok bool, err error)
+	// Set stores url under key with the given TTL.
+	Set(ctx context.Context, key, url string, ttl time.Duration) error
+	// Delete removes key from the cache.
+	Delete(ctx context.Context, key string) error
+}
+
+// ValkeyCache is a Cache backed by Valkey / Redis via go-redis.
+type ValkeyCache struct {
+	rdb *redis.Client
+}
+
+// New creates a ValkeyCache connecting to addr (e.g. "valkey:6379").
+// The connection is not established until the first command; use Ping to
+// verify connectivity at startup.
+func New(addr string) *ValkeyCache {
+	rdb := redis.NewClient(&redis.Options{
+		Addr:         addr,
+		DialTimeout:  2 * time.Second,
+		ReadTimeout:  1 * time.Second,
+		WriteTimeout: 1 * time.Second,
+	})
+	return &ValkeyCache{rdb: rdb}
+}
+
+// Ping checks connectivity. Call once at startup.
+func (c *ValkeyCache) Ping(ctx context.Context) error {
+	if err := c.rdb.Ping(ctx).Err(); err != nil {
+		return fmt.Errorf("presigncache: ping valkey: %w", err)
+	}
+	return nil
+}
+
+// Get returns (url, true, nil) on hit, ("", false, nil) on miss, and
+// ("", false, err) only on unexpected errors (not redis.Nil).
+func (c *ValkeyCache) Get(ctx context.Context, key string) (string, bool, error) {
+	val, err := c.rdb.Get(ctx, key).Result()
+	if err == redis.Nil {
+		return "", false, nil
+	}
+	if err != nil {
+		return "", false, fmt.Errorf("presigncache: get %q: %w", key, err)
+	}
+	return val, true, nil
+}
+
+// Set stores url under key with ttl. Errors are returned but are non-fatal
+// for callers — a Set failure means the next request will miss and regenerate.
+func (c *ValkeyCache) Set(ctx context.Context, key, url string, ttl time.Duration) error {
+	if err := c.rdb.Set(ctx, key, url, ttl).Err(); err != nil {
+		return fmt.Errorf("presigncache: set %q: %w", key, err)
+	}
+	return nil
+}
+
+// Delete removes key from the cache. It is not an error if the key does not exist.
+func (c *ValkeyCache) Delete(ctx context.Context, key string) error {
+	if err := c.rdb.Del(ctx, key).Err(); err != nil {
+		return fmt.Errorf("presigncache: delete %q: %w", key, err)
+	}
+	return nil
+}
+
+// NoopCache is a no-op Cache that always returns a miss. Used when Valkey is
+// not configured (e.g. local development without Docker).
+type NoopCache struct{}
+
+func (NoopCache) Get(_ context.Context, _ string) (string, bool, error)     { return "", false, nil }
+func (NoopCache) Set(_ context.Context, _, _ string, _ time.Duration) error { return nil }
+func (NoopCache) Delete(_ context.Context, _ string) error                  { return nil }

v3/backend/internal/runner/browse_refresh.go

@@ -0,0 +1,176 @@
+package runner
+
+// browse_refresh.go — independent 6-hour loop that fetches novelfire.net
+// browse page snapshots and stores them in MinIO.
+//
+// Design:
+//   - Runs on its own ticker (BrowseRefreshInterval, default 6h) inside Run().
+//   - Fetches page 1 for each combination of the standard genre/sort/status
+//     filter values and stores the parsed JSON blob in MinIO via BrowseStore.
+//   - The backend's handleBrowse then serves from MinIO instead of calling
+//     novelfire.net live, which avoids IP-based rate-limiting on the server.
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"regexp"
+	"strings"
+	"time"
+)
+
+// browseNovelListing mirrors backend.NovelListing for JSON serialisation.
+type browseNovelListing struct {
+	Slug  string `json:"slug"`
+	Title string `json:"title"`
+	Cover string `json:"cover"`
+	URL   string `json:"url"`
+}
+
+// browseSnapshot is the JSON structure stored in MinIO.
+type browseSnapshot struct {
+	Novels  []browseNovelListing `json:"novels"`
+	Page    int                  `json:"page"`
+	HasNext bool                 `json:"hasNext"`
+	// CachedAt is the UTC time the snapshot was written (ISO 8601).
+	CachedAt string `json:"cachedAt"`
+}
+
+// browseCombos lists the filter combinations to pre-fetch.
+// Each entry is (genre, sort, status, novelType).
+var browseCombos = []struct{ genre, sort, status, novelType string }{
+	{"all", "popular", "all", "all-novel"},
+	{"all", "popular", "ongoing", "all-novel"},
+	{"all", "popular", "completed", "all-novel"},
+	{"all", "new", "all", "all-novel"},
+	{"all", "new", "ongoing", "all-novel"},
+	{"all", "new", "completed", "all-novel"},
+	{"all", "top-rated", "all", "all-novel"},
+	{"all", "top-rated", "ongoing", "all-novel"},
+	{"all", "top-rated", "completed", "all-novel"},
+}
+
+const novelFireBrowseBase = "https://novelfire.net"
+
+// runBrowseRefresh fetches all browse combos from novelfire.net and stores
+// the results in MinIO. Errors per-combo are logged but do not abort the
+// whole refresh cycle.
+func (r *Runner) runBrowseRefresh(ctx context.Context) {
+	if r.deps.BrowseStore == nil {
+		r.deps.Log.Warn("runner: browse refresh skipped — BrowseStore not configured")
+		return
+	}
+
+	log := r.deps.Log.With("op", "browse_refresh")
+	log.Info("runner: browse refresh starting", "combos", len(browseCombos))
+
+	ok, fail := 0, 0
+	for _, c := range browseCombos {
+		if ctx.Err() != nil {
+			break
+		}
+		novels, hasNext, err := fetchBrowsePage(ctx, c.genre, c.sort, c.status, c.novelType)
+		if err != nil {
+			log.Warn("runner: browse fetch failed",
+				"genre", c.genre, "sort", c.sort, "status", c.status, "err", err)
+			fail++
+			continue
+		}
+
+		snap := browseSnapshot{
+			Novels:   novels,
+			Page:     1,
+			HasNext:  hasNext,
+			CachedAt: time.Now().UTC().Format(time.RFC3339),
+		}
+		data, _ := json.Marshal(snap)
+		if err := r.deps.BrowseStore.PutBrowsePage(ctx, c.genre, c.sort, c.status, c.novelType, 1, data); err != nil {
+			log.Warn("runner: browse put failed",
+				"genre", c.genre, "sort", c.sort, "status", c.status, "err", err)
+			fail++
+			continue
+		}
+		ok++
+	}
+
+	log.Info("runner: browse refresh finished", "ok", ok, "failed", fail)
+}
+
+// fetchBrowsePage calls novelfire.net and returns a list of novel listings
+// plus a hasNext flag. Mirrors the logic in backend/handlers.go.
+func fetchBrowsePage(ctx context.Context, genre, sort, status, novelType string) ([]browseNovelListing, bool, error) {
+	pageURL := fmt.Sprintf("%s/genre-%s/sort-%s/status-%s/%s?page=1",
+		novelFireBrowseBase, genre, sort, status, novelType)
+
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet, pageURL, nil)
+	if err != nil {
+		return nil, false, fmt.Errorf("build request: %w", err)
+	}
+	req.Header.Set("User-Agent", "Mozilla/5.0 (compatible; libnovel-runner/2)")
+	req.Header.Set("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8")
+	req.Header.Set("Accept-Language", "en-US,en;q=0.9")
+
+	httpClient := &http.Client{Timeout: 45 * time.Second}
+	resp, err := httpClient.Do(req)
+	if err != nil {
+		return nil, false, fmt.Errorf("fetch %s: %w", pageURL, err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		_, _ = io.Copy(io.Discard, resp.Body)
+		return nil, false, fmt.Errorf("upstream returned %d for %s", resp.StatusCode, pageURL)
+	}
+
+	return parseBrowseHTML(resp.Body)
+}
+
+// parseBrowseHTML parses a novelfire HTML response body. Mirrors parseBrowsePage
+// in backend/handlers.go — kept separate to avoid coupling packages.
+func parseBrowseHTML(r io.Reader) ([]browseNovelListing, bool, error) {
+	data, err := io.ReadAll(r)
+	if err != nil {
+		return nil, false, err
+	}
+	body := string(data)
+
+	hasNext := strings.Contains(body, `rel="next"`) ||
+		strings.Contains(body, `aria-label="Next"`) ||
+		strings.Contains(body, `class="next"`)
+
+	slugRe := regexp.MustCompile(`href="/book/([^/"]+)"`)
+	titleRe := regexp.MustCompile(`class="novel-title[^"]*"[^>]*>([^<]+)<`)
+	coverRe := regexp.MustCompile(`data-src="(https?://[^"]+)"`)
+
+	slugMatches := slugRe.FindAllStringSubmatch(body, -1)
+	titleMatches := titleRe.FindAllStringSubmatch(body, -1)
+	coverMatches := coverRe.FindAllStringSubmatch(body, -1)
+
+	var novels []browseNovelListing
+	seen := make(map[string]bool)
+	for i, sm := range slugMatches {
+		slug := sm[1]
+		if seen[slug] {
+			continue
+		}
+		seen[slug] = true
+
+		item := browseNovelListing{
+			Slug: slug,
+			URL:  novelFireBrowseBase + "/book/" + slug,
+		}
+		if i < len(titleMatches) {
+			item.Title = strings.TrimSpace(titleMatches[i][1])
+		}
+		if i < len(coverMatches) {
+			item.Cover = coverMatches[i][1]
+		}
+		if item.Title != "" {
+			novels = append(novels, item)
+		}
+	}
+
+	return novels, hasNext, nil
+}

v3/backend/internal/runner/catalogue_refresh.go

@@ -0,0 +1,177 @@
+package runner
+
+// catalogue_refresh.go — independent loop that walks the full novelfire.net
+// catalogue, scrapes per-book metadata, downloads cover images to MinIO, and
+// indexes every book in Meilisearch.
+//
+// Design:
+//   - Runs on its own ticker (CatalogueRefreshInterval, default 24h) inside Run().
+//   - Also fires once on startup.
+//   - ScrapeCatalogue streams CatalogueEntry values over a channel — we iterate
+//     and call ScrapeMetadata for each entry.
+//   - Per-request random jitter (1–3s) prevents hammering novelfire.net.
+//   - Cover images are fetched from the URL embedded in BookMeta.Cover and
+//     stored in MinIO (browse bucket, key: covers/{slug}.jpg).
+//   - WriteMetadata + UpsertBook are called for every successfully scraped book.
+//   - Errors for individual books are logged and skipped; the loop continues.
+//   - The cover URL stored in BookMeta.Cover is rewritten to the internal proxy
+//     path (/api/cover/novelfire.net/{slug}) so the UI always fetches via the
+//     backend, which will serve from MinIO.
+
+import (
+	"context"
+	"fmt"
+	"io"
+	"math/rand"
+	"net/http"
+	"time"
+)
+
+// runCatalogueRefresh performs one full catalogue walk: scrapes metadata for
+// every book on novelfire.net, downloads covers to MinIO, and upserts to
+// Meilisearch. Errors for individual books are logged and skipped.
+func (r *Runner) runCatalogueRefresh(ctx context.Context) {
+	if r.deps.Novel == nil {
+		r.deps.Log.Warn("runner: catalogue refresh skipped — Novel scraper not configured")
+		return
+	}
+	if r.deps.BookWriter == nil {
+		r.deps.Log.Warn("runner: catalogue refresh skipped — BookWriter not configured")
+		return
+	}
+
+	log := r.deps.Log.With("op", "catalogue_refresh")
+	log.Info("runner: catalogue refresh starting")
+
+	entries, errCh := r.deps.Novel.ScrapeCatalogue(ctx)
+
+	ok, skipped, errCount := 0, 0, 0
+	for entry := range entries {
+		if ctx.Err() != nil {
+			break
+		}
+
+		// Random jitter between books to avoid rate-limiting.
+		jitter := time.Duration(1000+rand.Intn(2000)) * time.Millisecond
+		select {
+		case <-ctx.Done():
+			break
+		case <-time.After(jitter):
+		}
+
+		meta, err := r.deps.Novel.ScrapeMetadata(ctx, entry.URL)
+		if err != nil {
+			log.Warn("runner: catalogue refresh: metadata scrape failed",
+				"url", entry.URL, "err", err)
+			errCount++
+			continue
+		}
+
+		// Rewrite cover URL to backend proxy path so UI never hits CDN directly.
+		originalCover := meta.Cover
+		meta.Cover = fmt.Sprintf("/api/cover/novelfire.net/%s", meta.Slug)
+
+		// Persist to PocketBase.
+		if err := r.deps.BookWriter.WriteMetadata(ctx, meta); err != nil {
+			log.Warn("runner: catalogue refresh: WriteMetadata failed",
+				"slug", meta.Slug, "err", err)
+			errCount++
+			continue
+		}
+
+		// Index in Meilisearch.
+		if err := r.deps.SearchIndex.UpsertBook(ctx, meta); err != nil {
+			log.Warn("runner: catalogue refresh: UpsertBook failed",
+				"slug", meta.Slug, "err", err)
+			// non-fatal — continue
+		}
+
+		// Download and store cover image in MinIO if we have a cover URL
+		// and a CoverStore is wired in.
+		if r.deps.CoverStore != nil && originalCover != "" {
+			if !r.deps.CoverStore.CoverExists(ctx, meta.Slug) {
+				if err := r.downloadCover(ctx, meta.Slug, originalCover); err != nil {
+					log.Warn("runner: catalogue refresh: cover download failed",
+						"slug", meta.Slug, "url", originalCover, "err", err)
+					// non-fatal
+				}
+			}
+		}
+
+		ok++
+		if ok%100 == 0 {
+			log.Info("runner: catalogue refresh progress",
+				"scraped", ok, "errors", errCount)
+		}
+	}
+
+	if err := <-errCh; err != nil {
+		log.Warn("runner: catalogue refresh: catalogue stream error", "err", err)
+	}
+
+	log.Info("runner: catalogue refresh finished",
+		"ok", ok, "skipped", skipped, "errors", errCount)
+}
+
+// downloadCover fetches the cover image from coverURL and stores it in MinIO
+// under covers/{slug}.jpg. It retries up to 3 times with exponential backoff
+// on transient errors (5xx, network failures).
+func (r *Runner) downloadCover(ctx context.Context, slug, coverURL string) error {
+	const maxRetries = 3
+	delay := 2 * time.Second
+
+	var lastErr error
+	for attempt := 0; attempt < maxRetries; attempt++ {
+		if ctx.Err() != nil {
+			return ctx.Err()
+		}
+		if attempt > 0 {
+			select {
+			case <-ctx.Done():
+				return ctx.Err()
+			case <-time.After(delay):
+			}
+			delay *= 2
+		}
+
+		data, err := fetchCoverBytes(ctx, coverURL)
+		if err != nil {
+			lastErr = err
+			continue
+		}
+
+		if err := r.deps.CoverStore.PutCover(ctx, slug, data, ""); err != nil {
+			return fmt.Errorf("put cover: %w", err)
+		}
+		return nil
+	}
+	return fmt.Errorf("download cover after %d retries: %w", maxRetries, lastErr)
+}
+
+// fetchCoverBytes performs a single HTTP GET for coverURL and returns the body.
+func fetchCoverBytes(ctx context.Context, coverURL string) ([]byte, error) {
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet, coverURL, nil)
+	if err != nil {
+		return nil, fmt.Errorf("build request: %w", err)
+	}
+	req.Header.Set("User-Agent", "Mozilla/5.0 (compatible; libnovel-runner/2)")
+	req.Header.Set("Referer", "https://novelfire.net/")
+
+	client := &http.Client{Timeout: 30 * time.Second}
+	resp, err := client.Do(req)
+	if err != nil {
+		return nil, fmt.Errorf("http get: %w", err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode >= 500 {
+		_, _ = io.Copy(io.Discard, resp.Body)
+		return nil, fmt.Errorf("upstream %d for %s", resp.StatusCode, coverURL)
+	}
+	if resp.StatusCode != http.StatusOK {
+		_, _ = io.Copy(io.Discard, resp.Body)
+		return nil, fmt.Errorf("unexpected status %d for %s", resp.StatusCode, coverURL)
+	}
+
+	return io.ReadAll(io.LimitReader(resp.Body, 5<<20)) // 5 MiB cap
+}

v3/backend/internal/runner/helpers.go

@@ -0,0 +1,21 @@
+package runner
+
+import (
+	"regexp"
+	"strings"
+)
+
+// stripMarkdown removes common markdown syntax from src, returning plain text
+// suitable for TTS. Mirrors the helper in the scraper's server package.
+func stripMarkdown(src string) string {
+	src = regexp.MustCompile(`(?m)^#{1,6}\s+`).ReplaceAllString(src, "")
+	src = regexp.MustCompile(`\*{1,3}|_{1,3}`).ReplaceAllString(src, "")
+	src = regexp.MustCompile("(?s)```.*?```").ReplaceAllString(src, "")
+	src = regexp.MustCompile("`[^`]*`").ReplaceAllString(src, "")
+	src = regexp.MustCompile(`\[([^\]]+)\]\([^)]+\)`).ReplaceAllString(src, "$1")
+	src = regexp.MustCompile(`!\[[^\]]*\]\([^)]+\)`).ReplaceAllString(src, "")
+	src = regexp.MustCompile(`(?m)^>\s?`).ReplaceAllString(src, "")
+	src = regexp.MustCompile(`(?m)^[-*_]{3,}\s*$`).ReplaceAllString(src, "")
+	src = regexp.MustCompile(`\n{3,}`).ReplaceAllString(src, "\n\n")
+	return strings.TrimSpace(src)
+}

v3/backend/internal/runner/metrics.go

@@ -0,0 +1,92 @@
+package runner
+
+// metrics.go — lightweight HTTP metrics endpoint for the runner.
+//
+// GET /metrics returns a JSON document with live task counters and uptime.
+// No external dependency (no Prometheus); plain net/http only.
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"log/slog"
+	"net"
+	"net/http"
+	"time"
+)
+
+// metricsServer serves GET /metrics for the runner process.
+type metricsServer struct {
+	addr string
+	r    *Runner
+	log  *slog.Logger
+}
+
+func newMetricsServer(addr string, r *Runner, log *slog.Logger) *metricsServer {
+	return &metricsServer{addr: addr, r: r, log: log}
+}
+
+// ListenAndServe starts the HTTP server and blocks until ctx is cancelled or
+// a fatal listen error occurs.
+func (ms *metricsServer) ListenAndServe(ctx context.Context) error {
+	mux := http.NewServeMux()
+	mux.HandleFunc("GET /metrics", ms.handleMetrics)
+	mux.HandleFunc("GET /health", ms.handleHealth)
+
+	srv := &http.Server{
+		Addr:         ms.addr,
+		Handler:      mux,
+		ReadTimeout:  5 * time.Second,
+		WriteTimeout: 5 * time.Second,
+		BaseContext:  func(_ net.Listener) context.Context { return ctx },
+	}
+
+	errCh := make(chan error, 1)
+	go func() {
+		ms.log.Info("runner: metrics server listening", "addr", ms.addr)
+		errCh <- srv.ListenAndServe()
+	}()
+
+	select {
+	case <-ctx.Done():
+		shutCtx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+		defer cancel()
+		_ = srv.Shutdown(shutCtx)
+		return nil
+	case err := <-errCh:
+		return fmt.Errorf("runner: metrics server: %w", err)
+	}
+}
+
+// handleMetrics handles GET /metrics.
+// Response shape (JSON):
+//
+//	{
+//	  "tasks_running":   N,
+//	  "tasks_completed": N,
+//	  "tasks_failed":    N,
+//	  "uptime_seconds":  N
+//	}
+func (ms *metricsServer) handleMetrics(w http.ResponseWriter, _ *http.Request) {
+	uptimeSec := int64(time.Since(ms.r.startedAt).Seconds())
+	metricsWriteJSON(w, 0, map[string]int64{
+		"tasks_running":   ms.r.tasksRunning.Load(),
+		"tasks_completed": ms.r.tasksCompleted.Load(),
+		"tasks_failed":    ms.r.tasksFailed.Load(),
+		"uptime_seconds":  uptimeSec,
+	})
+}
+
+// handleHealth handles GET /health — simple liveness probe for the metrics server.
+func (ms *metricsServer) handleHealth(w http.ResponseWriter, _ *http.Request) {
+	metricsWriteJSON(w, 0, map[string]string{"status": "ok"})
+}
+
+// metricsWriteJSON writes v as a JSON response with the given status code.
+func metricsWriteJSON(w http.ResponseWriter, status int, v any) {
+	w.Header().Set("Content-Type", "application/json")
+	if status != 0 {
+		w.WriteHeader(status)
+	}
+	_ = json.NewEncoder(w).Encode(v)
+}

v3/backend/internal/runner/runner.go

@@ -0,0 +1,440 @@
+// Package runner implements the worker loop that polls PocketBase for pending
+// scrape and audio tasks, executes them, and reports results back.
+//
+// Design:
+//   - Run(ctx) loops on a ticker; each tick claims and dispatches pending tasks.
+//   - Scrape tasks are dispatched to the Orchestrator (one goroutine per task,
+//     up to MaxConcurrentScrape).
+//   - Audio tasks fetch chapter text, call Kokoro, upload to MinIO, and report
+//     the result back (up to MaxConcurrentAudio goroutines).
+//   - The runner is stateless between ticks; all state lives in PocketBase.
+//   - Atomic task counters are exposed via /metrics (see metrics.go).
+//   - Books are indexed in Meilisearch via an orchestrator.Config.PostMetadata
+//     hook injected at construction time.
+package runner
+
+import (
+	"context"
+	"fmt"
+	"log/slog"
+	"sync"
+	"sync/atomic"
+	"time"
+
+	"github.com/libnovel/backend/internal/bookstore"
+	"github.com/libnovel/backend/internal/domain"
+	"github.com/libnovel/backend/internal/kokoro"
+	"github.com/libnovel/backend/internal/meili"
+	"github.com/libnovel/backend/internal/orchestrator"
+	"github.com/libnovel/backend/internal/scraper"
+	"github.com/libnovel/backend/internal/taskqueue"
+)
+
+// Config tunes the runner behaviour.
+type Config struct {
+	// WorkerID uniquely identifies this runner instance in PocketBase records.
+	WorkerID string
+	// PollInterval is how often the runner checks for new tasks.
+	PollInterval time.Duration
+	// MaxConcurrentScrape limits simultaneous book-scrape goroutines.
+	MaxConcurrentScrape int
+	// MaxConcurrentAudio limits simultaneous audio-generation goroutines.
+	MaxConcurrentAudio int
+	// OrchestratorWorkers is the chapter-scraping parallelism inside each book run.
+	OrchestratorWorkers int
+	// HeartbeatInterval is how often active tasks PATCH their heartbeat_at
+	// timestamp to signal they are still alive. Defaults to 30s when 0.
+	HeartbeatInterval time.Duration
+	// StaleTaskThreshold is how old a heartbeat must be (or absent) before the
+	// task is considered orphaned and reset to pending. Defaults to 2m when 0.
+	StaleTaskThreshold time.Duration
+	// BrowseRefreshInterval is how often the runner pre-fetches browse page
+	// snapshots from novelfire.net and stores them in MinIO. Defaults to 6h.
+	BrowseRefreshInterval time.Duration
+	// CatalogueRefreshInterval is how often the runner walks the full catalogue,
+	// scrapes per-book metadata, downloads covers, and re-indexes everything in
+	// Meilisearch. Defaults to 24h (expensive — full catalogue walk).
+	CatalogueRefreshInterval time.Duration
+	// MetricsAddr is the HTTP listen address for the /metrics endpoint.
+	// Defaults to ":9091". Set to "" to disable.
+	MetricsAddr string
+}
+
+// Dependencies are the external services the runner depends on.
+type Dependencies struct {
+	// Consumer claims tasks from PocketBase.
+	Consumer taskqueue.Consumer
+	// BookWriter persists scraped data (used by orchestrator).
+	BookWriter bookstore.BookWriter
+	// BookReader reads chapter text for audio generation.
+	BookReader bookstore.BookReader
+	// AudioStore persists generated audio and checks key existence.
+	AudioStore bookstore.AudioStore
+	// BrowseStore stores browse page snapshots in MinIO.
+	BrowseStore bookstore.BrowseStore
+	// CoverStore stores book cover images in MinIO.
+	// If nil, cover downloads are skipped during catalogue refresh.
+	CoverStore bookstore.CoverStore
+	// SearchIndex indexes books in Meilisearch after scraping.
+	// If nil a no-op is used.
+	SearchIndex meili.Client
+	// Novel is the scraper implementation.
+	Novel scraper.NovelScraper
+	// Kokoro is the TTS client.
+	Kokoro kokoro.Client
+	// Log is the structured logger.
+	Log *slog.Logger
+}
+
+// Runner is the main worker process.
+type Runner struct {
+	cfg  Config
+	deps Dependencies
+
+	// Atomic task counters — read by /metrics without locking.
+	tasksRunning   atomic.Int64
+	tasksCompleted atomic.Int64
+	tasksFailed    atomic.Int64
+
+	startedAt time.Time
+}
+
+// New creates a Runner from cfg and deps.
+func New(cfg Config, deps Dependencies) *Runner {
+	if cfg.PollInterval <= 0 {
+		cfg.PollInterval = 30 * time.Second
+	}
+	if cfg.MaxConcurrentScrape <= 0 {
+		cfg.MaxConcurrentScrape = 2
+	}
+	if cfg.MaxConcurrentAudio <= 0 {
+		cfg.MaxConcurrentAudio = 1
+	}
+	if cfg.WorkerID == "" {
+		cfg.WorkerID = "runner"
+	}
+	if cfg.HeartbeatInterval <= 0 {
+		cfg.HeartbeatInterval = 30 * time.Second
+	}
+	if cfg.StaleTaskThreshold <= 0 {
+		cfg.StaleTaskThreshold = 2 * time.Minute
+	}
+	if cfg.BrowseRefreshInterval <= 0 {
+		cfg.BrowseRefreshInterval = 6 * time.Hour
+	}
+	if cfg.CatalogueRefreshInterval <= 0 {
+		cfg.CatalogueRefreshInterval = 24 * time.Hour
+	}
+	if cfg.MetricsAddr == "" {
+		cfg.MetricsAddr = ":9091"
+	}
+	if deps.Log == nil {
+		deps.Log = slog.Default()
+	}
+	if deps.SearchIndex == nil {
+		deps.SearchIndex = meili.NoopClient{}
+	}
+	return &Runner{cfg: cfg, deps: deps, startedAt: time.Now()}
+}
+
+// Run starts the poll loop and the metrics HTTP server, blocking until ctx is
+// cancelled.
+func (r *Runner) Run(ctx context.Context) error {
+	r.deps.Log.Info("runner: starting",
+		"worker_id", r.cfg.WorkerID,
+		"poll_interval", r.cfg.PollInterval,
+		"max_scrape", r.cfg.MaxConcurrentScrape,
+		"max_audio", r.cfg.MaxConcurrentAudio,
+		"browse_refresh_interval", r.cfg.BrowseRefreshInterval,
+		"catalogue_refresh_interval", r.cfg.CatalogueRefreshInterval,
+		"metrics_addr", r.cfg.MetricsAddr,
+	)
+
+	// Start metrics HTTP server in background if configured.
+	if r.cfg.MetricsAddr != "" {
+		ms := newMetricsServer(r.cfg.MetricsAddr, r, r.deps.Log)
+		go func() {
+			if err := ms.ListenAndServe(ctx); err != nil {
+				r.deps.Log.Error("runner: metrics server error", "err", err)
+			}
+		}()
+	}
+
+	scrapeSem := make(chan struct{}, r.cfg.MaxConcurrentScrape)
+	audioSem := make(chan struct{}, r.cfg.MaxConcurrentAudio)
+	var wg sync.WaitGroup
+
+	tick := time.NewTicker(r.cfg.PollInterval)
+	defer tick.Stop()
+
+	browseTick := time.NewTicker(r.cfg.BrowseRefreshInterval)
+	defer browseTick.Stop()
+
+	catalogueTick := time.NewTicker(r.cfg.CatalogueRefreshInterval)
+	defer catalogueTick.Stop()
+
+	// Run one browse refresh immediately on startup.
+	go r.runBrowseRefresh(ctx)
+	// Run one catalogue refresh immediately on startup.
+	go r.runCatalogueRefresh(ctx)
+
+	// Run one poll immediately on startup, then on each tick.
+	for {
+		r.poll(ctx, scrapeSem, audioSem, &wg)
+
+		select {
+		case <-ctx.Done():
+			r.deps.Log.Info("runner: context cancelled, draining active tasks")
+			done := make(chan struct{})
+			go func() {
+				wg.Wait()
+				close(done)
+			}()
+			select {
+			case <-done:
+				r.deps.Log.Info("runner: all tasks drained, exiting")
+			case <-time.After(2 * time.Minute):
+				r.deps.Log.Warn("runner: drain timeout exceeded, forcing exit")
+			}
+			return nil
+		case <-browseTick.C:
+			go r.runBrowseRefresh(ctx)
+		case <-catalogueTick.C:
+			go r.runCatalogueRefresh(ctx)
+		case <-tick.C:
+		}
+	}
+}
+
+// poll claims all available pending tasks and dispatches them to goroutines.
+func (r *Runner) poll(ctx context.Context, scrapeSem, audioSem chan struct{}, wg *sync.WaitGroup) {
+	// ── Reap orphaned tasks ───────────────────────────────────────────────
+	if n, err := r.deps.Consumer.ReapStaleTasks(ctx, r.cfg.StaleTaskThreshold); err != nil {
+		r.deps.Log.Warn("runner: reap stale tasks failed", "err", err)
+	} else if n > 0 {
+		r.deps.Log.Info("runner: reaped stale tasks", "count", n)
+	}
+
+	// ── Scrape tasks ──────────────────────────────────────────────────────
+	for {
+		if ctx.Err() != nil {
+			return
+		}
+		task, ok, err := r.deps.Consumer.ClaimNextScrapeTask(ctx, r.cfg.WorkerID)
+		if err != nil {
+			r.deps.Log.Error("runner: ClaimNextScrapeTask failed", "err", err)
+			break
+		}
+		if !ok {
+			break
+		}
+		select {
+		case scrapeSem <- struct{}{}:
+		default:
+			r.deps.Log.Warn("runner: scrape semaphore full, will retry next tick",
+				"task_id", task.ID)
+			break
+		}
+		r.tasksRunning.Add(1)
+		wg.Add(1)
+		go func(t domain.ScrapeTask) {
+			defer wg.Done()
+			defer func() { <-scrapeSem }()
+			defer r.tasksRunning.Add(-1)
+			r.runScrapeTask(ctx, t)
+		}(task)
+	}
+
+	// ── Audio tasks ───────────────────────────────────────────────────────
+	for {
+		if ctx.Err() != nil {
+			return
+		}
+		task, ok, err := r.deps.Consumer.ClaimNextAudioTask(ctx, r.cfg.WorkerID)
+		if err != nil {
+			r.deps.Log.Error("runner: ClaimNextAudioTask failed", "err", err)
+			break
+		}
+		if !ok {
+			break
+		}
+		select {
+		case audioSem <- struct{}{}:
+		default:
+			r.deps.Log.Warn("runner: audio semaphore full, will retry next tick",
+				"task_id", task.ID)
+			break
+		}
+		r.tasksRunning.Add(1)
+		wg.Add(1)
+		go func(t domain.AudioTask) {
+			defer wg.Done()
+			defer func() { <-audioSem }()
+			defer r.tasksRunning.Add(-1)
+			r.runAudioTask(ctx, t)
+		}(task)
+	}
+}
+
+// newOrchestrator builds an orchestrator with the Meilisearch post-hook wired in.
+func (r *Runner) newOrchestrator() *orchestrator.Orchestrator {
+	oCfg := orchestrator.Config{
+		Workers: r.cfg.OrchestratorWorkers,
+		PostMetadata: func(ctx context.Context, meta domain.BookMeta) {
+			if err := r.deps.SearchIndex.UpsertBook(ctx, meta); err != nil {
+				r.deps.Log.Warn("runner: meilisearch upsert failed",
+					"slug", meta.Slug, "err", err)
+			}
+		},
+	}
+	return orchestrator.New(oCfg, r.deps.Novel, r.deps.BookWriter, r.deps.Log)
+}
+
+// runScrapeTask executes one scrape task end-to-end and reports the result.
+func (r *Runner) runScrapeTask(ctx context.Context, task domain.ScrapeTask) {
+	log := r.deps.Log.With("task_id", task.ID, "kind", task.Kind, "url", task.TargetURL)
+	log.Info("runner: scrape task starting")
+
+	hbCtx, hbCancel := context.WithCancel(ctx)
+	defer hbCancel()
+	go func() {
+		tick := time.NewTicker(r.cfg.HeartbeatInterval)
+		defer tick.Stop()
+		for {
+			select {
+			case <-hbCtx.Done():
+				return
+			case <-tick.C:
+				if err := r.deps.Consumer.HeartbeatTask(ctx, task.ID); err != nil {
+					log.Warn("runner: heartbeat failed", "err", err)
+				}
+			}
+		}
+	}()
+
+	o := r.newOrchestrator()
+	var result domain.ScrapeResult
+
+	switch task.Kind {
+	case "catalogue":
+		result = r.runCatalogueTask(ctx, task, o, log)
+	case "book", "book_range":
+		result = o.RunBook(ctx, task)
+	default:
+		result.ErrorMessage = fmt.Sprintf("unknown task kind: %q", task.Kind)
+		log.Warn("runner: unknown task kind")
+	}
+
+	if err := r.deps.Consumer.FinishScrapeTask(ctx, task.ID, result); err != nil {
+		log.Error("runner: FinishScrapeTask failed", "err", err)
+	}
+
+	if result.ErrorMessage != "" {
+		r.tasksFailed.Add(1)
+	} else {
+		r.tasksCompleted.Add(1)
+	}
+
+	log.Info("runner: scrape task finished",
+		"scraped", result.ChaptersScraped,
+		"skipped", result.ChaptersSkipped,
+		"errors", result.Errors,
+	)
+}
+
+// runCatalogueTask runs a full catalogue scrape.
+func (r *Runner) runCatalogueTask(ctx context.Context, task domain.ScrapeTask, o *orchestrator.Orchestrator, log *slog.Logger) domain.ScrapeResult {
+	entries, errCh := r.deps.Novel.ScrapeCatalogue(ctx)
+	var result domain.ScrapeResult
+
+	for entry := range entries {
+		if ctx.Err() != nil {
+			break
+		}
+		bookTask := domain.ScrapeTask{
+			ID:        task.ID,
+			Kind:      "book",
+			TargetURL: entry.URL,
+		}
+		bookResult := o.RunBook(ctx, bookTask)
+		result.BooksFound += bookResult.BooksFound + 1
+		result.ChaptersScraped += bookResult.ChaptersScraped
+		result.ChaptersSkipped += bookResult.ChaptersSkipped
+		result.Errors += bookResult.Errors
+	}
+
+	if err := <-errCh; err != nil {
+		log.Warn("runner: catalogue scrape finished with error", "err", err)
+		result.Errors++
+		if result.ErrorMessage == "" {
+			result.ErrorMessage = err.Error()
+		}
+	}
+	return result
+}
+
+// runAudioTask executes one audio-generation task.
+func (r *Runner) runAudioTask(ctx context.Context, task domain.AudioTask) {
+	log := r.deps.Log.With("task_id", task.ID, "slug", task.Slug, "chapter", task.Chapter, "voice", task.Voice)
+	log.Info("runner: audio task starting")
+
+	hbCtx, hbCancel := context.WithCancel(ctx)
+	defer hbCancel()
+	go func() {
+		tick := time.NewTicker(r.cfg.HeartbeatInterval)
+		defer tick.Stop()
+		for {
+			select {
+			case <-hbCtx.Done():
+				return
+			case <-tick.C:
+				if err := r.deps.Consumer.HeartbeatTask(ctx, task.ID); err != nil {
+					log.Warn("runner: heartbeat failed", "err", err)
+				}
+			}
+		}
+	}()
+
+	fail := func(msg string) {
+		log.Error("runner: audio task failed", "reason", msg)
+		r.tasksFailed.Add(1)
+		result := domain.AudioResult{ErrorMessage: msg}
+		if err := r.deps.Consumer.FinishAudioTask(ctx, task.ID, result); err != nil {
+			log.Error("runner: FinishAudioTask failed", "err", err)
+		}
+	}
+
+	raw, err := r.deps.BookReader.ReadChapter(ctx, task.Slug, task.Chapter)
+	if err != nil {
+		fail(fmt.Sprintf("read chapter: %v", err))
+		return
+	}
+	text := stripMarkdown(raw)
+	if text == "" {
+		fail("chapter text is empty after stripping markdown")
+		return
+	}
+
+	if r.deps.Kokoro == nil {
+		fail("kokoro client not configured")
+		return
+	}
+	audioData, err := r.deps.Kokoro.GenerateAudio(ctx, text, task.Voice)
+	if err != nil {
+		fail(fmt.Sprintf("kokoro generate: %v", err))
+		return
+	}
+
+	key := r.deps.AudioStore.AudioObjectKey(task.Slug, task.Chapter, task.Voice)
+	if err := r.deps.AudioStore.PutAudio(ctx, key, audioData); err != nil {
+		fail(fmt.Sprintf("put audio: %v", err))
+		return
+	}
+
+	r.tasksCompleted.Add(1)
+	result := domain.AudioResult{ObjectKey: key}
+	if err := r.deps.Consumer.FinishAudioTask(ctx, task.ID, result); err != nil {
+		log.Error("runner: FinishAudioTask failed", "err", err)
+	}
+	log.Info("runner: audio task finished", "key", key)
+}

v3/backend/internal/runner/runner_test.go

@@ -0,0 +1,365 @@
+package runner_test
+
+import (
+	"context"
+	"errors"
+	"sync/atomic"
+	"testing"
+	"time"
+
+	"github.com/libnovel/backend/internal/domain"
+	"github.com/libnovel/backend/internal/runner"
+)
+
+// ── Stub types ────────────────────────────────────────────────────────────────
+
+// stubConsumer is a test double for taskqueue.Consumer.
+type stubConsumer struct {
+	scrapeQueue []domain.ScrapeTask
+	audioQueue  []domain.AudioTask
+	scrapeIdx   int
+	audioIdx    int
+	finished    []string
+	failCalled  []string
+	claimErr    error
+}
+
+func (s *stubConsumer) ClaimNextScrapeTask(_ context.Context, _ string) (domain.ScrapeTask, bool, error) {
+	if s.claimErr != nil {
+		return domain.ScrapeTask{}, false, s.claimErr
+	}
+	if s.scrapeIdx >= len(s.scrapeQueue) {
+		return domain.ScrapeTask{}, false, nil
+	}
+	t := s.scrapeQueue[s.scrapeIdx]
+	s.scrapeIdx++
+	return t, true, nil
+}
+
+func (s *stubConsumer) ClaimNextAudioTask(_ context.Context, _ string) (domain.AudioTask, bool, error) {
+	if s.claimErr != nil {
+		return domain.AudioTask{}, false, s.claimErr
+	}
+	if s.audioIdx >= len(s.audioQueue) {
+		return domain.AudioTask{}, false, nil
+	}
+	t := s.audioQueue[s.audioIdx]
+	s.audioIdx++
+	return t, true, nil
+}
+
+func (s *stubConsumer) FinishScrapeTask(_ context.Context, id string, _ domain.ScrapeResult) error {
+	s.finished = append(s.finished, id)
+	return nil
+}
+
+func (s *stubConsumer) FinishAudioTask(_ context.Context, id string, _ domain.AudioResult) error {
+	s.finished = append(s.finished, id)
+	return nil
+}
+
+func (s *stubConsumer) FailTask(_ context.Context, id, _ string) error {
+	s.failCalled = append(s.failCalled, id)
+	return nil
+}
+
+func (s *stubConsumer) HeartbeatTask(_ context.Context, _ string) error { return nil }
+
+func (s *stubConsumer) ReapStaleTasks(_ context.Context, _ time.Duration) (int, error) {
+	return 0, nil
+}
+
+// stubBookWriter satisfies bookstore.BookWriter (no-op).
+type stubBookWriter struct{}
+
+func (s *stubBookWriter) WriteMetadata(_ context.Context, _ domain.BookMeta) error { return nil }
+func (s *stubBookWriter) WriteChapter(_ context.Context, _ string, _ domain.Chapter) error {
+	return nil
+}
+func (s *stubBookWriter) WriteChapterRefs(_ context.Context, _ string, _ []domain.ChapterRef) error {
+	return nil
+}
+func (s *stubBookWriter) ChapterExists(_ context.Context, _ string, _ domain.ChapterRef) bool {
+	return false
+}
+
+// stubBookReader satisfies bookstore.BookReader — returns a single chapter.
+type stubBookReader struct {
+	text    string
+	readErr error
+}
+
+func (s *stubBookReader) ReadChapter(_ context.Context, _ string, _ int) (string, error) {
+	return s.text, s.readErr
+}
+func (s *stubBookReader) ReadMetadata(_ context.Context, _ string) (domain.BookMeta, bool, error) {
+	return domain.BookMeta{}, false, nil
+}
+func (s *stubBookReader) ListBooks(_ context.Context) ([]domain.BookMeta, error) { return nil, nil }
+func (s *stubBookReader) LocalSlugs(_ context.Context) (map[string]bool, error)  { return nil, nil }
+func (s *stubBookReader) MetadataMtime(_ context.Context, _ string) int64        { return 0 }
+func (s *stubBookReader) ListChapters(_ context.Context, _ string) ([]domain.ChapterInfo, error) {
+	return nil, nil
+}
+func (s *stubBookReader) CountChapters(_ context.Context, _ string) int { return 0 }
+func (s *stubBookReader) ReindexChapters(_ context.Context, _ string) (int, error) {
+	return 0, nil
+}
+
+// stubAudioStore satisfies bookstore.AudioStore.
+type stubAudioStore struct {
+	putCalled atomic.Int32
+	putErr    error
+}
+
+func (s *stubAudioStore) AudioObjectKey(slug string, n int, voice string) string {
+	return slug + "/" + string(rune('0'+n)) + "/" + voice + ".mp3"
+}
+func (s *stubAudioStore) AudioExists(_ context.Context, _ string) bool { return false }
+func (s *stubAudioStore) PutAudio(_ context.Context, _ string, _ []byte) error {
+	s.putCalled.Add(1)
+	return s.putErr
+}
+
+// stubNovelScraper satisfies scraper.NovelScraper minimally.
+type stubNovelScraper struct {
+	entries  []domain.CatalogueEntry
+	metaErr  error
+	chapters []domain.ChapterRef
+}
+
+func (s *stubNovelScraper) ScrapeCatalogue(_ context.Context) (<-chan domain.CatalogueEntry, <-chan error) {
+	ch := make(chan domain.CatalogueEntry, len(s.entries))
+	errCh := make(chan error, 1)
+	for _, e := range s.entries {
+		ch <- e
+	}
+	close(ch)
+	close(errCh)
+	return ch, errCh
+}
+
+func (s *stubNovelScraper) ScrapeMetadata(_ context.Context, _ string) (domain.BookMeta, error) {
+	if s.metaErr != nil {
+		return domain.BookMeta{}, s.metaErr
+	}
+	return domain.BookMeta{Slug: "test-book", Title: "Test Book", SourceURL: "https://example.com/book/test-book"}, nil
+}
+
+func (s *stubNovelScraper) ScrapeChapterList(_ context.Context, _ string) ([]domain.ChapterRef, error) {
+	return s.chapters, nil
+}
+
+func (s *stubNovelScraper) ScrapeChapterText(_ context.Context, ref domain.ChapterRef) (domain.Chapter, error) {
+	return domain.Chapter{Ref: ref, Text: "# Chapter\n\nSome text."}, nil
+}
+
+func (s *stubNovelScraper) ScrapeRanking(_ context.Context, _ int) (<-chan domain.BookMeta, <-chan error) {
+	ch := make(chan domain.BookMeta)
+	errCh := make(chan error, 1)
+	close(ch)
+	close(errCh)
+	return ch, errCh
+}
+
+func (s *stubNovelScraper) SourceName() string { return "stub" }
+
+// stubKokoro satisfies kokoro.Client.
+type stubKokoro struct {
+	data   []byte
+	genErr error
+	called atomic.Int32
+}
+
+func (s *stubKokoro) GenerateAudio(_ context.Context, _, _ string) ([]byte, error) {
+	s.called.Add(1)
+	return s.data, s.genErr
+}
+
+func (s *stubKokoro) ListVoices(_ context.Context) ([]string, error) {
+	return []string{"af_bella"}, nil
+}
+
+// ── stripMarkdown helper ──────────────────────────────────────────────────────
+
+func TestStripMarkdownViaAudioTask(t *testing.T) {
+	// Verify markdown is stripped before sending to Kokoro.
+	// We inject chapter text with markdown; the kokoro stub verifies data flows.
+	consumer := &stubConsumer{
+		audioQueue: []domain.AudioTask{
+			{ID: "a1", Slug: "book", Chapter: 1, Voice: "af_bella", Status: domain.TaskStatusRunning},
+		},
+	}
+	bookReader := &stubBookReader{text: "## Chapter 1\n\nPlain **text** here."}
+	audioStore := &stubAudioStore{}
+	kokoroStub := &stubKokoro{data: []byte("mp3")}
+
+	cfg := runner.Config{
+		WorkerID:     "test",
+		PollInterval: time.Hour, // long poll — we'll cancel manually
+	}
+	deps := runner.Dependencies{
+		Consumer:   consumer,
+		BookWriter: &stubBookWriter{},
+		BookReader: bookReader,
+		AudioStore: audioStore,
+		Novel:      &stubNovelScraper{},
+		Kokoro:     kokoroStub,
+	}
+
+	r := runner.New(cfg, deps)
+	ctx, cancel := context.WithTimeout(context.Background(), 2*time.Second)
+	defer cancel()
+	_ = r.Run(ctx)
+
+	if kokoroStub.called.Load() != 1 {
+		t.Errorf("expected Kokoro.GenerateAudio called once, got %d", kokoroStub.called.Load())
+	}
+	if audioStore.putCalled.Load() != 1 {
+		t.Errorf("expected PutAudio called once, got %d", audioStore.putCalled.Load())
+	}
+}
+
+func TestAudioTask_ReadChapterError(t *testing.T) {
+	consumer := &stubConsumer{
+		audioQueue: []domain.AudioTask{
+			{ID: "a2", Slug: "book", Chapter: 2, Voice: "af_bella", Status: domain.TaskStatusRunning},
+		},
+	}
+	bookReader := &stubBookReader{readErr: errors.New("chapter not found")}
+	audioStore := &stubAudioStore{}
+	kokoroStub := &stubKokoro{data: []byte("mp3")}
+
+	cfg := runner.Config{WorkerID: "test", PollInterval: time.Hour}
+	deps := runner.Dependencies{
+		Consumer:   consumer,
+		BookWriter: &stubBookWriter{},
+		BookReader: bookReader,
+		AudioStore: audioStore,
+		Novel:      &stubNovelScraper{},
+		Kokoro:     kokoroStub,
+	}
+
+	r := runner.New(cfg, deps)
+	ctx, cancel := context.WithTimeout(context.Background(), 2*time.Second)
+	defer cancel()
+	_ = r.Run(ctx)
+
+	// Kokoro should not be called; FinishAudioTask should be called with error.
+	if kokoroStub.called.Load() != 0 {
+		t.Errorf("expected Kokoro not called, got %d", kokoroStub.called.Load())
+	}
+	if len(consumer.finished) != 1 {
+		t.Errorf("expected FinishAudioTask called once, got %d", len(consumer.finished))
+	}
+}
+
+func TestAudioTask_KokoroError(t *testing.T) {
+	consumer := &stubConsumer{
+		audioQueue: []domain.AudioTask{
+			{ID: "a3", Slug: "book", Chapter: 3, Voice: "af_bella", Status: domain.TaskStatusRunning},
+		},
+	}
+	bookReader := &stubBookReader{text: "Chapter text."}
+	audioStore := &stubAudioStore{}
+	kokoroStub := &stubKokoro{genErr: errors.New("tts failed")}
+
+	cfg := runner.Config{WorkerID: "test", PollInterval: time.Hour}
+	deps := runner.Dependencies{
+		Consumer:   consumer,
+		BookWriter: &stubBookWriter{},
+		BookReader: bookReader,
+		AudioStore: audioStore,
+		Novel:      &stubNovelScraper{},
+		Kokoro:     kokoroStub,
+	}
+
+	r := runner.New(cfg, deps)
+	ctx, cancel := context.WithTimeout(context.Background(), 2*time.Second)
+	defer cancel()
+	_ = r.Run(ctx)
+
+	if audioStore.putCalled.Load() != 0 {
+		t.Errorf("expected PutAudio not called, got %d", audioStore.putCalled.Load())
+	}
+	if len(consumer.finished) != 1 {
+		t.Errorf("expected FinishAudioTask called once, got %d", len(consumer.finished))
+	}
+}
+
+func TestScrapeTask_BookKind(t *testing.T) {
+	consumer := &stubConsumer{
+		scrapeQueue: []domain.ScrapeTask{
+			{ID: "s1", Kind: "book", TargetURL: "https://example.com/book/test-book", Status: domain.TaskStatusRunning},
+		},
+	}
+
+	cfg := runner.Config{WorkerID: "test", PollInterval: time.Hour}
+	deps := runner.Dependencies{
+		Consumer:   consumer,
+		BookWriter: &stubBookWriter{},
+		BookReader: &stubBookReader{},
+		AudioStore: &stubAudioStore{},
+		Novel:      &stubNovelScraper{},
+		Kokoro:     &stubKokoro{},
+	}
+
+	r := runner.New(cfg, deps)
+	ctx, cancel := context.WithTimeout(context.Background(), 2*time.Second)
+	defer cancel()
+	_ = r.Run(ctx)
+
+	if len(consumer.finished) != 1 || consumer.finished[0] != "s1" {
+		t.Errorf("expected task s1 finished, got %v", consumer.finished)
+	}
+}
+
+func TestScrapeTask_UnknownKind(t *testing.T) {
+	consumer := &stubConsumer{
+		scrapeQueue: []domain.ScrapeTask{
+			{ID: "s2", Kind: "unknown_kind", Status: domain.TaskStatusRunning},
+		},
+	}
+
+	cfg := runner.Config{WorkerID: "test", PollInterval: time.Hour}
+	deps := runner.Dependencies{
+		Consumer:   consumer,
+		BookWriter: &stubBookWriter{},
+		BookReader: &stubBookReader{},
+		AudioStore: &stubAudioStore{},
+		Novel:      &stubNovelScraper{},
+		Kokoro:     &stubKokoro{},
+	}
+
+	r := runner.New(cfg, deps)
+	ctx, cancel := context.WithTimeout(context.Background(), 2*time.Second)
+	defer cancel()
+	_ = r.Run(ctx)
+
+	// Unknown kind still finishes the task (with error message in result).
+	if len(consumer.finished) != 1 || consumer.finished[0] != "s2" {
+		t.Errorf("expected task s2 finished, got %v", consumer.finished)
+	}
+}
+
+func TestRun_CancelImmediately(t *testing.T) {
+	consumer := &stubConsumer{}
+	cfg := runner.Config{WorkerID: "test", PollInterval: 10 * time.Millisecond}
+	deps := runner.Dependencies{
+		Consumer:   consumer,
+		BookWriter: &stubBookWriter{},
+		BookReader: &stubBookReader{},
+		AudioStore: &stubAudioStore{},
+		Novel:      &stubNovelScraper{},
+		Kokoro:     &stubKokoro{},
+	}
+
+	r := runner.New(cfg, deps)
+	ctx, cancel := context.WithCancel(context.Background())
+	cancel() // cancel before Run
+
+	err := r.Run(ctx)
+	if err != nil {
+		t.Errorf("expected nil on graceful shutdown, got %v", err)
+	}
+}

v3/backend/internal/scraper/scraper.go

@@ -0,0 +1,58 @@
+// Package scraper defines the NovelScraper interface and its sub-interfaces.
+// Domain types live in internal/domain — this package only defines the scraping
+// contract so that novelfire and any future scrapers can be swapped freely.
+package scraper
+
+import (
+	"context"
+
+	"github.com/libnovel/backend/internal/domain"
+)
+
+// CatalogueProvider can enumerate every novel available on a source site.
+type CatalogueProvider interface {
+	ScrapeCatalogue(ctx context.Context) (<-chan domain.CatalogueEntry, <-chan error)
+}
+
+// MetadataProvider can extract structured book metadata from a novel's landing page.
+type MetadataProvider interface {
+	ScrapeMetadata(ctx context.Context, bookURL string) (domain.BookMeta, error)
+}
+
+// ChapterListProvider can enumerate all chapters of a book.
+type ChapterListProvider interface {
+	ScrapeChapterList(ctx context.Context, bookURL string) ([]domain.ChapterRef, error)
+}
+
+// ChapterTextProvider can extract the readable text from a single chapter page.
+type ChapterTextProvider interface {
+	ScrapeChapterText(ctx context.Context, ref domain.ChapterRef) (domain.Chapter, error)
+}
+
+// RankingProvider can enumerate novels from a ranking page.
+type RankingProvider interface {
+	// ScrapeRanking pages through up to maxPages ranking pages.
+	// maxPages <= 0 means all pages.
+	ScrapeRanking(ctx context.Context, maxPages int) (<-chan domain.BookMeta, <-chan error)
+}
+
+// NovelScraper is the full interface a concrete novel source must implement.
+type NovelScraper interface {
+	CatalogueProvider
+	MetadataProvider
+	ChapterListProvider
+	ChapterTextProvider
+	RankingProvider
+
+	// SourceName returns the human-readable name of this scraper, e.g. "novelfire.net".
+	SourceName() string
+}
+
+// Selector describes how to locate an element in an HTML document.
+type Selector struct {
+	Tag      string
+	Class    string
+	ID       string
+	Attr     string
+	Multiple bool
+}

v3/backend/internal/storage/minio.go

@@ -0,0 +1,270 @@
+package storage
+
+import (
+	"context"
+	"fmt"
+	"io"
+	"net/url"
+	"path"
+	"strings"
+	"time"
+
+	minio "github.com/minio/minio-go/v7"
+	"github.com/minio/minio-go/v7/pkg/credentials"
+
+	"github.com/libnovel/backend/internal/config"
+)
+
+// minioClient wraps the official minio-go client with bucket names.
+type minioClient struct {
+	client         *minio.Client // internal — all read/write operations
+	pubClient      *minio.Client // presign-only — initialised against the public endpoint
+	bucketChapters string
+	bucketAudio    string
+	bucketAvatars  string
+	bucketBrowse   string
+}
+
+func newMinioClient(cfg config.MinIO) (*minioClient, error) {
+	creds := credentials.NewStaticV4(cfg.AccessKey, cfg.SecretKey, "")
+
+	internal, err := minio.New(cfg.Endpoint, &minio.Options{
+		Creds:  creds,
+		Secure: cfg.UseSSL,
+	})
+	if err != nil {
+		return nil, fmt.Errorf("minio: init internal client: %w", err)
+	}
+
+	// Presigned URLs must be signed with the hostname the browser will use
+	// (PUBLIC_MINIO_PUBLIC_URL), because AWS Signature V4 includes the Host
+	// header in the canonical request — a URL signed against "minio:9000" will
+	// return SignatureDoesNotMatch when the browser fetches it from
+	// "localhost:9000".
+	//
+	// However, minio-go normally makes a live BucketLocation HTTP call before
+	// signing, which would fail from inside the container when the public
+	// endpoint is externally-facing (e.g. "localhost:9000" is unreachable from
+	// within Docker).  We prevent this by:
+	//   1. Setting Region: "us-east-1" — minio-go skips getBucketLocation when
+	//      the region is already known (bucket-cache.go:49).
+	//   2. Setting BucketLookup: BucketLookupPath — forces path-style URLs
+	//      (e.g. host/bucket/key), matching MinIO's default behaviour and
+	//      avoiding any virtual-host DNS probing.
+	//
+	// When no public endpoint is configured (or it equals the internal one),
+	// fall back to the internal client so presigning still works.
+	publicEndpoint := cfg.PublicEndpoint
+	if u, err2 := url.Parse(publicEndpoint); err2 == nil && u.Host != "" {
+		publicEndpoint = u.Host // strip scheme so minio.New is happy
+	}
+	pubUseSSL := cfg.PublicUseSSL
+	if publicEndpoint == "" || publicEndpoint == cfg.Endpoint {
+		publicEndpoint = cfg.Endpoint
+		pubUseSSL = cfg.UseSSL
+	}
+	pub, err := minio.New(publicEndpoint, &minio.Options{
+		Creds:        creds,
+		Secure:       pubUseSSL,
+		Region:       "us-east-1", // skip live BucketLocation preflight
+		BucketLookup: minio.BucketLookupPath,
+	})
+	if err != nil {
+		return nil, fmt.Errorf("minio: init public client: %w", err)
+	}
+
+	return &minioClient{
+		client:         internal,
+		pubClient:      pub,
+		bucketChapters: cfg.BucketChapters,
+		bucketAudio:    cfg.BucketAudio,
+		bucketAvatars:  cfg.BucketAvatars,
+		bucketBrowse:   cfg.BucketBrowse,
+	}, nil
+}
+
+// ensureBuckets creates all required buckets if they don't already exist.
+func (m *minioClient) ensureBuckets(ctx context.Context) error {
+	for _, bucket := range []string{m.bucketChapters, m.bucketAudio, m.bucketAvatars, m.bucketBrowse} {
+		exists, err := m.client.BucketExists(ctx, bucket)
+		if err != nil {
+			return fmt.Errorf("minio: check bucket %q: %w", bucket, err)
+		}
+		if !exists {
+			if err := m.client.MakeBucket(ctx, bucket, minio.MakeBucketOptions{}); err != nil {
+				return fmt.Errorf("minio: create bucket %q: %w", bucket, err)
+			}
+		}
+	}
+	return nil
+}
+
+// ── Key helpers ───────────────────────────────────────────────────────────────
+
+// ChapterObjectKey returns the MinIO object key for a chapter markdown file.
+// Format: {slug}/chapter-{n:06d}.md
+func ChapterObjectKey(slug string, n int) string {
+	return fmt.Sprintf("%s/chapter-%06d.md", slug, n)
+}
+
+// AudioObjectKey returns the MinIO object key for a cached audio file.
+// Format: {slug}/{n}/{voice}.mp3
+func AudioObjectKey(slug string, n int, voice string) string {
+	return fmt.Sprintf("%s/%d/%s.mp3", slug, n, voice)
+}
+
+// AvatarObjectKey returns the MinIO object key for a user avatar image.
+// Format: {userID}/{ext}.{ext}
+func AvatarObjectKey(userID, ext string) string {
+	return fmt.Sprintf("%s/%s.%s", userID, ext, ext)
+}
+
+// BrowseObjectKey returns the MinIO object key for a cached browse page snapshot.
+// Format: browse/{genre}/{sort}/{status}/{type}/page-{n}.json
+func BrowseObjectKey(genre, sort, status, novelType string, page int) string {
+	return fmt.Sprintf("browse/%s/%s/%s/%s/page-%d.json", genre, sort, status, novelType, page)
+}
+
+// CoverObjectKey returns the MinIO object key for a book cover image.
+// Format: covers/{slug}.jpg
+func CoverObjectKey(slug string) string {
+	return fmt.Sprintf("covers/%s.jpg", slug)
+}
+
+// chapterNumberFromKey extracts the chapter number from a MinIO object key.
+// e.g. "my-book/chapter-000042.md" → 42
+func chapterNumberFromKey(key string) int {
+	base := path.Base(key)
+	base = strings.TrimPrefix(base, "chapter-")
+	base = strings.TrimSuffix(base, ".md")
+	var n int
+	fmt.Sscanf(base, "%d", &n)
+	return n
+}
+
+// ── Object operations ─────────────────────────────────────────────────────────
+
+func (m *minioClient) putObject(ctx context.Context, bucket, key, contentType string, data []byte) error {
+	_, err := m.client.PutObject(ctx, bucket, key,
+		strings.NewReader(string(data)),
+		int64(len(data)),
+		minio.PutObjectOptions{ContentType: contentType},
+	)
+	return err
+}
+
+func (m *minioClient) getObject(ctx context.Context, bucket, key string) ([]byte, error) {
+	obj, err := m.client.GetObject(ctx, bucket, key, minio.GetObjectOptions{})
+	if err != nil {
+		return nil, err
+	}
+	defer obj.Close()
+	return io.ReadAll(obj)
+}
+
+func (m *minioClient) objectExists(ctx context.Context, bucket, key string) bool {
+	_, err := m.client.StatObject(ctx, bucket, key, minio.StatObjectOptions{})
+	return err == nil
+}
+
+func (m *minioClient) presignGet(ctx context.Context, bucket, key string, expires time.Duration) (string, error) {
+	u, err := m.pubClient.PresignedGetObject(ctx, bucket, key, expires, nil)
+	if err != nil {
+		return "", fmt.Errorf("minio presign %s/%s: %w", bucket, key, err)
+	}
+	return u.String(), nil
+}
+
+func (m *minioClient) presignPut(ctx context.Context, bucket, key string, expires time.Duration) (string, error) {
+	u, err := m.pubClient.PresignedPutObject(ctx, bucket, key, expires)
+	if err != nil {
+		return "", fmt.Errorf("minio presign PUT %s/%s: %w", bucket, key, err)
+	}
+	return u.String(), nil
+}
+
+func (m *minioClient) deleteObjects(ctx context.Context, bucket, prefix string) error {
+	objCh := m.client.ListObjects(ctx, bucket, minio.ListObjectsOptions{Prefix: prefix})
+	for obj := range objCh {
+		if obj.Err != nil {
+			return obj.Err
+		}
+		if err := m.client.RemoveObject(ctx, bucket, obj.Key, minio.RemoveObjectOptions{}); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func (m *minioClient) listObjectKeys(ctx context.Context, bucket, prefix string) ([]string, error) {
+	var keys []string
+	for obj := range m.client.ListObjects(ctx, bucket, minio.ListObjectsOptions{Prefix: prefix}) {
+		if obj.Err != nil {
+			return nil, obj.Err
+		}
+		keys = append(keys, obj.Key)
+	}
+	return keys, nil
+}
+
+// ── Browse operations ─────────────────────────────────────────────────────────
+
+// putBrowse stores raw JSON bytes for a browse page snapshot.
+func (m *minioClient) putBrowse(ctx context.Context, key string, data []byte) error {
+	return m.putObject(ctx, m.bucketBrowse, key, "application/json", data)
+}
+
+// getBrowse retrieves a browse page snapshot. Returns (nil, false, nil) when
+// the object does not exist.
+func (m *minioClient) getBrowse(ctx context.Context, key string) ([]byte, bool, error) {
+	if !m.objectExists(ctx, m.bucketBrowse, key) {
+		return nil, false, nil
+	}
+	data, err := m.getObject(ctx, m.bucketBrowse, key)
+	if err != nil {
+		return nil, false, err
+	}
+	return data, true, nil
+}
+
+// ── Cover operations ──────────────────────────────────────────────────────────
+
+// putCover stores a raw cover image in the browse bucket under covers/{slug}.jpg.
+func (m *minioClient) putCover(ctx context.Context, key, contentType string, data []byte) error {
+	return m.putObject(ctx, m.bucketBrowse, key, contentType, data)
+}
+
+// getCover retrieves a cover image. Returns (nil, "", false, nil) when the
+// object does not exist.
+func (m *minioClient) getCover(ctx context.Context, key string) ([]byte, bool, error) {
+	if !m.objectExists(ctx, m.bucketBrowse, key) {
+		return nil, false, nil
+	}
+	data, err := m.getObject(ctx, m.bucketBrowse, key)
+	if err != nil {
+		return nil, false, err
+	}
+	return data, true, nil
+}
+
+// coverExists returns true when the cover image object exists.
+func (m *minioClient) coverExists(ctx context.Context, key string) bool {
+	return m.objectExists(ctx, m.bucketBrowse, key)
+}
+
+// coverContentType inspects the first bytes of data to determine if it is
+// a JPEG or PNG image. Falls back to "image/jpeg".
+func coverContentType(data []byte) string {
+	if len(data) >= 4 {
+		// PNG magic: 0x89 0x50 0x4E 0x47
+		if data[0] == 0x89 && data[1] == 0x50 && data[2] == 0x4E && data[3] == 0x47 {
+			return "image/png"
+		}
+		// WebP: starts with "RIFF" at 0..3 and "WEBP" at 8..11
+		if len(data) >= 12 && data[0] == 'R' && data[1] == 'I' && data[2] == 'F' && data[3] == 'F' &&
+			data[8] == 'W' && data[9] == 'E' && data[10] == 'B' && data[11] == 'P' {
+			return "image/webp"
+		}
+	}
+	return "image/jpeg"
+}

v3/backend/internal/storage/pocketbase.go

@@ -0,0 +1,268 @@
+// Package storage provides the concrete implementations of all bookstore and
+// taskqueue interfaces backed by PocketBase (structured data) and MinIO (blobs).
+//
+// Entry point: NewStore(ctx, cfg, log) returns a *Store that satisfies every
+// interface defined in bookstore and taskqueue.
+package storage
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"log/slog"
+	"net/http"
+	"net/url"
+	"strings"
+	"sync"
+	"time"
+
+	"github.com/libnovel/backend/internal/config"
+	"github.com/libnovel/backend/internal/domain"
+)
+
+// ErrNotFound is returned by single-record lookups when no record exists.
+var ErrNotFound = errors.New("storage: record not found")
+
+// pbClient is the internal PocketBase REST admin client.
+type pbClient struct {
+	baseURL  string
+	email    string
+	password string
+	log      *slog.Logger
+
+	mu    sync.Mutex
+	token string
+	exp   time.Time
+}
+
+func newPBClient(cfg config.PocketBase, log *slog.Logger) *pbClient {
+	return &pbClient{
+		baseURL:  strings.TrimRight(cfg.URL, "/"),
+		email:    cfg.AdminEmail,
+		password: cfg.AdminPassword,
+		log:      log,
+	}
+}
+
+// authToken returns a valid admin auth token, refreshing it when expired.
+func (c *pbClient) authToken(ctx context.Context) (string, error) {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+	if c.token != "" && time.Now().Before(c.exp) {
+		return c.token, nil
+	}
+
+	body, _ := json.Marshal(map[string]string{
+		"identity": c.email,
+		"password": c.password,
+	})
+	req, err := http.NewRequestWithContext(ctx, http.MethodPost,
+		c.baseURL+"/api/collections/_superusers/auth-with-password", bytes.NewReader(body))
+	if err != nil {
+		return "", fmt.Errorf("pb auth: build request: %w", err)
+	}
+	req.Header.Set("Content-Type", "application/json")
+
+	resp, err := http.DefaultClient.Do(req)
+	if err != nil {
+		return "", fmt.Errorf("pb auth: %w", err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		raw, _ := io.ReadAll(resp.Body)
+		return "", fmt.Errorf("pb auth: status %d: %s", resp.StatusCode, string(raw))
+	}
+
+	var payload struct {
+		Token string `json:"token"`
+	}
+	if err := json.NewDecoder(resp.Body).Decode(&payload); err != nil {
+		return "", fmt.Errorf("pb auth: decode: %w", err)
+	}
+	c.token = payload.Token
+	c.exp = time.Now().Add(30 * time.Minute)
+	return c.token, nil
+}
+
+// do executes an authenticated PocketBase REST request.
+func (c *pbClient) do(ctx context.Context, method, path string, body io.Reader) (*http.Response, error) {
+	tok, err := c.authToken(ctx)
+	if err != nil {
+		return nil, err
+	}
+
+	req, err := http.NewRequestWithContext(ctx, method, c.baseURL+path, body)
+	if err != nil {
+		return nil, fmt.Errorf("pb: build request %s %s: %w", method, path, err)
+	}
+	req.Header.Set("Authorization", tok)
+	if body != nil {
+		req.Header.Set("Content-Type", "application/json")
+	}
+
+	resp, err := http.DefaultClient.Do(req)
+	if err != nil {
+		return nil, fmt.Errorf("pb: %s %s: %w", method, path, err)
+	}
+	return resp, nil
+}
+
+// get is a convenience wrapper that decodes a JSON response into v.
+func (c *pbClient) get(ctx context.Context, path string, v any) error {
+	resp, err := c.do(ctx, http.MethodGet, path, nil)
+	if err != nil {
+		return err
+	}
+	defer resp.Body.Close()
+	if resp.StatusCode == http.StatusNotFound {
+		return ErrNotFound
+	}
+	if resp.StatusCode >= 400 {
+		raw, _ := io.ReadAll(resp.Body)
+		return fmt.Errorf("pb GET %s: status %d: %s", path, resp.StatusCode, string(raw))
+	}
+	return json.NewDecoder(resp.Body).Decode(v)
+}
+
+// post creates a record and decodes the created record into v.
+func (c *pbClient) post(ctx context.Context, path string, payload, v any) error {
+	b, err := json.Marshal(payload)
+	if err != nil {
+		return fmt.Errorf("pb: marshal: %w", err)
+	}
+	resp, err := c.do(ctx, http.MethodPost, path, bytes.NewReader(b))
+	if err != nil {
+		return err
+	}
+	defer resp.Body.Close()
+	if resp.StatusCode >= 400 {
+		raw, _ := io.ReadAll(resp.Body)
+		return fmt.Errorf("pb POST %s: status %d: %s", path, resp.StatusCode, string(raw))
+	}
+	if v != nil {
+		return json.NewDecoder(resp.Body).Decode(v)
+	}
+	return nil
+}
+
+// patch updates a record.
+func (c *pbClient) patch(ctx context.Context, path string, payload any) error {
+	b, err := json.Marshal(payload)
+	if err != nil {
+		return fmt.Errorf("pb: marshal: %w", err)
+	}
+	resp, err := c.do(ctx, http.MethodPatch, path, bytes.NewReader(b))
+	if err != nil {
+		return err
+	}
+	defer resp.Body.Close()
+	if resp.StatusCode >= 400 {
+		raw, _ := io.ReadAll(resp.Body)
+		return fmt.Errorf("pb PATCH %s: status %d: %s", path, resp.StatusCode, string(raw))
+	}
+	return nil
+}
+
+// delete removes a record.
+func (c *pbClient) delete(ctx context.Context, path string) error {
+	resp, err := c.do(ctx, http.MethodDelete, path, nil)
+	if err != nil {
+		return err
+	}
+	defer resp.Body.Close()
+	if resp.StatusCode == http.StatusNotFound {
+		return ErrNotFound
+	}
+	if resp.StatusCode >= 400 {
+		raw, _ := io.ReadAll(resp.Body)
+		return fmt.Errorf("pb DELETE %s: status %d: %s", path, resp.StatusCode, string(raw))
+	}
+	return nil
+}
+
+// listAll fetches all pages of a collection. PocketBase returns at most 200
+// records per page; we paginate until empty.
+func (c *pbClient) listAll(ctx context.Context, collection string, filter, sort string) ([]json.RawMessage, error) {
+	var all []json.RawMessage
+	page := 1
+	for {
+		q := url.Values{
+			"page":    {fmt.Sprintf("%d", page)},
+			"perPage": {"200"},
+		}
+		if filter != "" {
+			q.Set("filter", filter)
+		}
+		if sort != "" {
+			q.Set("sort", sort)
+		}
+		path := fmt.Sprintf("/api/collections/%s/records?%s", collection, q.Encode())
+
+		var result struct {
+			Items []json.RawMessage `json:"items"`
+			Page  int               `json:"page"`
+			Pages int               `json:"totalPages"`
+		}
+		if err := c.get(ctx, path, &result); err != nil {
+			return nil, err
+		}
+		all = append(all, result.Items...)
+		if result.Page >= result.Pages {
+			break
+		}
+		page++
+	}
+	return all, nil
+}
+
+// claimRecord atomically claims the first pending record matching collection.
+// It fetches the oldest pending record (filter + sort), then PATCHes it with
+// the claim payload. Returns (nil, nil) when the queue is empty.
+func (c *pbClient) claimRecord(ctx context.Context, collection, workerID string, extraClaim map[string]any) (json.RawMessage, error) {
+	q := url.Values{}
+	q.Set("filter", `status="pending"`)
+	q.Set("sort", "+started")
+	q.Set("perPage", "1")
+	path := fmt.Sprintf("/api/collections/%s/records?%s", collection, q.Encode())
+
+	var result struct {
+		Items []json.RawMessage `json:"items"`
+	}
+	if err := c.get(ctx, path, &result); err != nil {
+		return nil, fmt.Errorf("claimRecord list: %w", err)
+	}
+	if len(result.Items) == 0 {
+		return nil, nil // queue empty
+	}
+
+	var rec struct {
+		ID string `json:"id"`
+	}
+	if err := json.Unmarshal(result.Items[0], &rec); err != nil {
+		return nil, fmt.Errorf("claimRecord parse id: %w", err)
+	}
+
+	claim := map[string]any{
+		"status":    string(domain.TaskStatusRunning),
+		"worker_id": workerID,
+	}
+	for k, v := range extraClaim {
+		claim[k] = v
+	}
+
+	claimPath := fmt.Sprintf("/api/collections/%s/records/%s", collection, rec.ID)
+	if err := c.patch(ctx, claimPath, claim); err != nil {
+		return nil, fmt.Errorf("claimRecord patch: %w", err)
+	}
+
+	// Re-fetch the updated record so caller has current state.
+	var updated json.RawMessage
+	if err := c.get(ctx, claimPath, &updated); err != nil {
+		return nil, fmt.Errorf("claimRecord re-fetch: %w", err)
+	}
+	return updated, nil
+}

v3/backend/internal/storage/store.go

@@ -0,0 +1,824 @@
+package storage
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"log/slog"
+	"strings"
+	"time"
+
+	"github.com/libnovel/backend/internal/bookstore"
+	"github.com/libnovel/backend/internal/config"
+	"github.com/libnovel/backend/internal/domain"
+	"github.com/libnovel/backend/internal/taskqueue"
+)
+
+// Store is the unified persistence implementation that satisfies all bookstore
+// and taskqueue interfaces. It routes structured data to PocketBase and binary
+// blobs to MinIO.
+type Store struct {
+	pb  *pbClient
+	mc  *minioClient
+	log *slog.Logger
+}
+
+// NewStore initialises PocketBase and MinIO connections and ensures all MinIO
+// buckets exist. Returns a ready-to-use Store.
+func NewStore(ctx context.Context, cfg config.Config, log *slog.Logger) (*Store, error) {
+	pb := newPBClient(cfg.PocketBase, log)
+	// Validate PocketBase connectivity by fetching an auth token.
+	if _, err := pb.authToken(ctx); err != nil {
+		return nil, fmt.Errorf("pocketbase: %w", err)
+	}
+
+	mc, err := newMinioClient(cfg.MinIO)
+	if err != nil {
+		return nil, fmt.Errorf("minio: %w", err)
+	}
+	if err := mc.ensureBuckets(ctx); err != nil {
+		return nil, fmt.Errorf("minio: ensure buckets: %w", err)
+	}
+
+	return &Store{pb: pb, mc: mc, log: log}, nil
+}
+
+// Compile-time interface satisfaction.
+var _ bookstore.BookWriter = (*Store)(nil)
+var _ bookstore.BookReader = (*Store)(nil)
+var _ bookstore.RankingStore = (*Store)(nil)
+var _ bookstore.AudioStore = (*Store)(nil)
+var _ bookstore.PresignStore = (*Store)(nil)
+var _ bookstore.ProgressStore = (*Store)(nil)
+var _ bookstore.BrowseStore = (*Store)(nil)
+var _ bookstore.CoverStore = (*Store)(nil)
+var _ taskqueue.Producer = (*Store)(nil)
+var _ taskqueue.Consumer = (*Store)(nil)
+var _ taskqueue.Reader = (*Store)(nil)
+
+// ── BookWriter ────────────────────────────────────────────────────────────────
+
+func (s *Store) WriteMetadata(ctx context.Context, meta domain.BookMeta) error {
+	payload := map[string]any{
+		"slug":           meta.Slug,
+		"title":          meta.Title,
+		"author":         meta.Author,
+		"cover":          meta.Cover,
+		"status":         meta.Status,
+		"genres":         meta.Genres,
+		"summary":        meta.Summary,
+		"total_chapters": meta.TotalChapters,
+		"source_url":     meta.SourceURL,
+		"ranking":        meta.Ranking,
+		"rating":         meta.Rating,
+	}
+	// Upsert via filter: if exists PATCH, otherwise POST.
+	existing, err := s.getBookBySlug(ctx, meta.Slug)
+	if err != nil && err != ErrNotFound {
+		return fmt.Errorf("WriteMetadata: %w", err)
+	}
+	if err == ErrNotFound {
+		return s.pb.post(ctx, "/api/collections/books/records", payload, nil)
+	}
+	return s.pb.patch(ctx, fmt.Sprintf("/api/collections/books/records/%s", existing.ID), payload)
+}
+
+func (s *Store) WriteChapter(ctx context.Context, slug string, chapter domain.Chapter) error {
+	key := ChapterObjectKey(slug, chapter.Ref.Number)
+	if err := s.mc.putObject(ctx, s.mc.bucketChapters, key, "text/markdown", []byte(chapter.Text)); err != nil {
+		return fmt.Errorf("WriteChapter: minio: %w", err)
+	}
+	// Upsert the chapters_idx record in PocketBase.
+	return s.upsertChapterIdx(ctx, slug, chapter.Ref)
+}
+
+func (s *Store) WriteChapterRefs(ctx context.Context, slug string, refs []domain.ChapterRef) error {
+	for _, ref := range refs {
+		if err := s.upsertChapterIdx(ctx, slug, ref); err != nil {
+			s.log.Warn("WriteChapterRefs: upsert failed", "slug", slug, "chapter", ref.Number, "err", err)
+		}
+	}
+	return nil
+}
+
+func (s *Store) ChapterExists(ctx context.Context, slug string, ref domain.ChapterRef) bool {
+	return s.mc.objectExists(ctx, s.mc.bucketChapters, ChapterObjectKey(slug, ref.Number))
+}
+
+func (s *Store) upsertChapterIdx(ctx context.Context, slug string, ref domain.ChapterRef) error {
+	payload := map[string]any{
+		"slug":   slug,
+		"number": ref.Number,
+		"title":  ref.Title,
+	}
+	filter := fmt.Sprintf(`slug=%q&&number=%d`, slug, ref.Number)
+	items, err := s.pb.listAll(ctx, "chapters_idx", filter, "")
+	if err != nil && err != ErrNotFound {
+		return err
+	}
+	if len(items) == 0 {
+		return s.pb.post(ctx, "/api/collections/chapters_idx/records", payload, nil)
+	}
+	var rec struct {
+		ID string `json:"id"`
+	}
+	json.Unmarshal(items[0], &rec)
+	return s.pb.patch(ctx, fmt.Sprintf("/api/collections/chapters_idx/records/%s", rec.ID), payload)
+}
+
+// ── BookReader ────────────────────────────────────────────────────────────────
+
+type pbBook struct {
+	ID            string   `json:"id"`
+	Slug          string   `json:"slug"`
+	Title         string   `json:"title"`
+	Author        string   `json:"author"`
+	Cover         string   `json:"cover"`
+	Status        string   `json:"status"`
+	Genres        []string `json:"genres"`
+	Summary       string   `json:"summary"`
+	TotalChapters int      `json:"total_chapters"`
+	SourceURL     string   `json:"source_url"`
+	Ranking       int      `json:"ranking"`
+	Rating        float64  `json:"rating"`
+	Updated       string   `json:"updated"`
+}
+
+func (b pbBook) toDomain() domain.BookMeta {
+	return domain.BookMeta{
+		Slug:          b.Slug,
+		Title:         b.Title,
+		Author:        b.Author,
+		Cover:         b.Cover,
+		Status:        b.Status,
+		Genres:        b.Genres,
+		Summary:       b.Summary,
+		TotalChapters: b.TotalChapters,
+		SourceURL:     b.SourceURL,
+		Ranking:       b.Ranking,
+		Rating:        b.Rating,
+	}
+}
+
+func (s *Store) getBookBySlug(ctx context.Context, slug string) (pbBook, error) {
+	filter := fmt.Sprintf(`slug=%q`, slug)
+	items, err := s.pb.listAll(ctx, "books", filter, "")
+	if err != nil {
+		return pbBook{}, err
+	}
+	if len(items) == 0 {
+		return pbBook{}, ErrNotFound
+	}
+	var b pbBook
+	json.Unmarshal(items[0], &b)
+	return b, nil
+}
+
+func (s *Store) ReadMetadata(ctx context.Context, slug string) (domain.BookMeta, bool, error) {
+	b, err := s.getBookBySlug(ctx, slug)
+	if err == ErrNotFound {
+		return domain.BookMeta{}, false, nil
+	}
+	if err != nil {
+		return domain.BookMeta{}, false, err
+	}
+	return b.toDomain(), true, nil
+}
+
+func (s *Store) ListBooks(ctx context.Context) ([]domain.BookMeta, error) {
+	items, err := s.pb.listAll(ctx, "books", "", "title")
+	if err != nil {
+		return nil, err
+	}
+	books := make([]domain.BookMeta, 0, len(items))
+	for _, raw := range items {
+		var b pbBook
+		json.Unmarshal(raw, &b)
+		books = append(books, b.toDomain())
+	}
+	return books, nil
+}
+
+func (s *Store) LocalSlugs(ctx context.Context) (map[string]bool, error) {
+	items, err := s.pb.listAll(ctx, "books", "", "")
+	if err != nil {
+		return nil, err
+	}
+	slugs := make(map[string]bool, len(items))
+	for _, raw := range items {
+		var b struct {
+			Slug string `json:"slug"`
+		}
+		json.Unmarshal(raw, &b)
+		if b.Slug != "" {
+			slugs[b.Slug] = true
+		}
+	}
+	return slugs, nil
+}
+
+func (s *Store) MetadataMtime(ctx context.Context, slug string) int64 {
+	b, err := s.getBookBySlug(ctx, slug)
+	if err != nil {
+		return 0
+	}
+	t, err := time.Parse(time.RFC3339, b.Updated)
+	if err != nil {
+		return 0
+	}
+	return t.Unix()
+}
+
+func (s *Store) ReadChapter(ctx context.Context, slug string, n int) (string, error) {
+	data, err := s.mc.getObject(ctx, s.mc.bucketChapters, ChapterObjectKey(slug, n))
+	if err != nil {
+		return "", fmt.Errorf("ReadChapter: %w", err)
+	}
+	return string(data), nil
+}
+
+func (s *Store) ListChapters(ctx context.Context, slug string) ([]domain.ChapterInfo, error) {
+	filter := fmt.Sprintf(`slug=%q`, slug)
+	items, err := s.pb.listAll(ctx, "chapters_idx", filter, "number")
+	if err != nil {
+		return nil, err
+	}
+	chapters := make([]domain.ChapterInfo, 0, len(items))
+	for _, raw := range items {
+		var rec struct {
+			Number int    `json:"number"`
+			Title  string `json:"title"`
+		}
+		json.Unmarshal(raw, &rec)
+		chapters = append(chapters, domain.ChapterInfo{Number: rec.Number, Title: rec.Title})
+	}
+	return chapters, nil
+}
+
+func (s *Store) CountChapters(ctx context.Context, slug string) int {
+	chapters, err := s.ListChapters(ctx, slug)
+	if err != nil {
+		return 0
+	}
+	return len(chapters)
+}
+
+func (s *Store) ReindexChapters(ctx context.Context, slug string) (int, error) {
+	keys, err := s.mc.listObjectKeys(ctx, s.mc.bucketChapters, slug+"/")
+	if err != nil {
+		return 0, fmt.Errorf("ReindexChapters: list objects: %w", err)
+	}
+	count := 0
+	for _, key := range keys {
+		if !strings.HasSuffix(key, ".md") {
+			continue
+		}
+		n := chapterNumberFromKey(key)
+		if n == 0 {
+			continue
+		}
+		ref := domain.ChapterRef{Number: n}
+		if err := s.upsertChapterIdx(ctx, slug, ref); err != nil {
+			s.log.Warn("ReindexChapters: upsert failed", "key", key, "err", err)
+			continue
+		}
+		count++
+	}
+	return count, nil
+}
+
+// ── RankingStore ──────────────────────────────────────────────────────────────
+
+func (s *Store) WriteRankingItem(ctx context.Context, item domain.RankingItem) error {
+	payload := map[string]any{
+		"rank":       item.Rank,
+		"slug":       item.Slug,
+		"title":      item.Title,
+		"author":     item.Author,
+		"cover":      item.Cover,
+		"status":     item.Status,
+		"genres":     item.Genres,
+		"source_url": item.SourceURL,
+	}
+	filter := fmt.Sprintf(`slug=%q`, item.Slug)
+	items, err := s.pb.listAll(ctx, "ranking", filter, "")
+	if err != nil && err != ErrNotFound {
+		return err
+	}
+	if len(items) == 0 {
+		return s.pb.post(ctx, "/api/collections/ranking/records", payload, nil)
+	}
+	var rec struct {
+		ID string `json:"id"`
+	}
+	json.Unmarshal(items[0], &rec)
+	return s.pb.patch(ctx, fmt.Sprintf("/api/collections/ranking/records/%s", rec.ID), payload)
+}
+
+func (s *Store) ReadRankingItems(ctx context.Context) ([]domain.RankingItem, error) {
+	items, err := s.pb.listAll(ctx, "ranking", "", "rank")
+	if err != nil {
+		return nil, err
+	}
+	result := make([]domain.RankingItem, 0, len(items))
+	for _, raw := range items {
+		var rec struct {
+			Rank      int      `json:"rank"`
+			Slug      string   `json:"slug"`
+			Title     string   `json:"title"`
+			Author    string   `json:"author"`
+			Cover     string   `json:"cover"`
+			Status    string   `json:"status"`
+			Genres    []string `json:"genres"`
+			SourceURL string   `json:"source_url"`
+			Updated   string   `json:"updated"`
+		}
+		json.Unmarshal(raw, &rec)
+		t, _ := time.Parse(time.RFC3339, rec.Updated)
+		result = append(result, domain.RankingItem{
+			Rank:      rec.Rank,
+			Slug:      rec.Slug,
+			Title:     rec.Title,
+			Author:    rec.Author,
+			Cover:     rec.Cover,
+			Status:    rec.Status,
+			Genres:    rec.Genres,
+			SourceURL: rec.SourceURL,
+			Updated:   t,
+		})
+	}
+	return result, nil
+}
+
+func (s *Store) RankingFreshEnough(ctx context.Context, maxAge time.Duration) (bool, error) {
+	items, err := s.ReadRankingItems(ctx)
+	if err != nil || len(items) == 0 {
+		return false, err
+	}
+	var latest time.Time
+	for _, item := range items {
+		if item.Updated.After(latest) {
+			latest = item.Updated
+		}
+	}
+	return time.Since(latest) < maxAge, nil
+}
+
+// ── AudioStore ────────────────────────────────────────────────────────────────
+
+func (s *Store) AudioObjectKey(slug string, n int, voice string) string {
+	return AudioObjectKey(slug, n, voice)
+}
+
+func (s *Store) AudioExists(ctx context.Context, key string) bool {
+	return s.mc.objectExists(ctx, s.mc.bucketAudio, key)
+}
+
+func (s *Store) PutAudio(ctx context.Context, key string, data []byte) error {
+	return s.mc.putObject(ctx, s.mc.bucketAudio, key, "audio/mpeg", data)
+}
+
+// ── PresignStore ──────────────────────────────────────────────────────────────
+
+func (s *Store) PresignChapter(ctx context.Context, slug string, n int, expires time.Duration) (string, error) {
+	return s.mc.presignGet(ctx, s.mc.bucketChapters, ChapterObjectKey(slug, n), expires)
+}
+
+func (s *Store) PresignAudio(ctx context.Context, key string, expires time.Duration) (string, error) {
+	return s.mc.presignGet(ctx, s.mc.bucketAudio, key, expires)
+}
+
+func (s *Store) PresignAvatarUpload(ctx context.Context, userID, ext string) (uploadURL, key string, err error) {
+	key = AvatarObjectKey(userID, ext)
+	uploadURL, err = s.mc.presignPut(ctx, s.mc.bucketAvatars, key, 15*time.Minute)
+	return
+}
+
+func (s *Store) PresignAvatarURL(ctx context.Context, userID string) (string, bool, error) {
+	for _, ext := range []string{"jpg", "png", "webp"} {
+		key := AvatarObjectKey(userID, ext)
+		if s.mc.objectExists(ctx, s.mc.bucketAvatars, key) {
+			u, err := s.mc.presignGet(ctx, s.mc.bucketAvatars, key, 1*time.Hour)
+			return u, true, err
+		}
+	}
+	return "", false, nil
+}
+
+func (s *Store) DeleteAvatar(ctx context.Context, userID string) error {
+	return s.mc.deleteObjects(ctx, s.mc.bucketAvatars, userID+"/")
+}
+
+// ── ProgressStore ─────────────────────────────────────────────────────────────
+
+func (s *Store) GetProgress(ctx context.Context, sessionID, slug string) (domain.ReadingProgress, bool) {
+	filter := fmt.Sprintf(`session_id=%q&&slug=%q`, sessionID, slug)
+	items, err := s.pb.listAll(ctx, "progress", filter, "")
+	if err != nil || len(items) == 0 {
+		return domain.ReadingProgress{}, false
+	}
+	var rec struct {
+		Slug      string `json:"slug"`
+		Chapter   int    `json:"chapter"`
+		UpdatedAt string `json:"updated"`
+	}
+	json.Unmarshal(items[0], &rec)
+	t, _ := time.Parse(time.RFC3339, rec.UpdatedAt)
+	return domain.ReadingProgress{Slug: rec.Slug, Chapter: rec.Chapter, UpdatedAt: t}, true
+}
+
+func (s *Store) SetProgress(ctx context.Context, sessionID string, p domain.ReadingProgress) error {
+	payload := map[string]any{
+		"session_id": sessionID,
+		"slug":       p.Slug,
+		"chapter":    p.Chapter,
+	}
+	filter := fmt.Sprintf(`session_id=%q&&slug=%q`, sessionID, p.Slug)
+	items, err := s.pb.listAll(ctx, "progress", filter, "")
+	if err != nil && err != ErrNotFound {
+		return err
+	}
+	if len(items) == 0 {
+		return s.pb.post(ctx, "/api/collections/progress/records", payload, nil)
+	}
+	var rec struct {
+		ID string `json:"id"`
+	}
+	json.Unmarshal(items[0], &rec)
+	return s.pb.patch(ctx, fmt.Sprintf("/api/collections/progress/records/%s", rec.ID), payload)
+}
+
+func (s *Store) AllProgress(ctx context.Context, sessionID string) ([]domain.ReadingProgress, error) {
+	filter := fmt.Sprintf(`session_id=%q`, sessionID)
+	items, err := s.pb.listAll(ctx, "progress", filter, "-updated")
+	if err != nil {
+		return nil, err
+	}
+	result := make([]domain.ReadingProgress, 0, len(items))
+	for _, raw := range items {
+		var rec struct {
+			Slug      string `json:"slug"`
+			Chapter   int    `json:"chapter"`
+			UpdatedAt string `json:"updated"`
+		}
+		json.Unmarshal(raw, &rec)
+		t, _ := time.Parse(time.RFC3339, rec.UpdatedAt)
+		result = append(result, domain.ReadingProgress{Slug: rec.Slug, Chapter: rec.Chapter, UpdatedAt: t})
+	}
+	return result, nil
+}
+
+func (s *Store) DeleteProgress(ctx context.Context, sessionID, slug string) error {
+	filter := fmt.Sprintf(`session_id=%q&&slug=%q`, sessionID, slug)
+	items, err := s.pb.listAll(ctx, "progress", filter, "")
+	if err != nil || len(items) == 0 {
+		return nil
+	}
+	var rec struct {
+		ID string `json:"id"`
+	}
+	json.Unmarshal(items[0], &rec)
+	return s.pb.delete(ctx, fmt.Sprintf("/api/collections/progress/records/%s", rec.ID))
+}
+
+// ── taskqueue.Producer ────────────────────────────────────────────────────────
+
+func (s *Store) CreateScrapeTask(ctx context.Context, kind, targetURL string, fromChapter, toChapter int) (string, error) {
+	payload := map[string]any{
+		"kind":         kind,
+		"target_url":   targetURL,
+		"from_chapter": fromChapter,
+		"to_chapter":   toChapter,
+		"status":       string(domain.TaskStatusPending),
+		"started":      time.Now().UTC().Format(time.RFC3339),
+	}
+	var rec struct {
+		ID string `json:"id"`
+	}
+	if err := s.pb.post(ctx, "/api/collections/scraping_tasks/records", payload, &rec); err != nil {
+		return "", err
+	}
+	return rec.ID, nil
+}
+
+func (s *Store) CreateAudioTask(ctx context.Context, slug string, chapter int, voice string) (string, error) {
+	cacheKey := fmt.Sprintf("%s/%d/%s", slug, chapter, voice)
+	payload := map[string]any{
+		"cache_key": cacheKey,
+		"slug":      slug,
+		"chapter":   chapter,
+		"voice":     voice,
+		"status":    string(domain.TaskStatusPending),
+		"started":   time.Now().UTC().Format(time.RFC3339),
+	}
+	var rec struct {
+		ID string `json:"id"`
+	}
+	if err := s.pb.post(ctx, "/api/collections/audio_jobs/records", payload, &rec); err != nil {
+		return "", err
+	}
+	return rec.ID, nil
+}
+
+func (s *Store) CancelTask(ctx context.Context, id string) error {
+	// Try scraping_tasks first, then audio_jobs.
+	if err := s.pb.patch(ctx, fmt.Sprintf("/api/collections/scraping_tasks/records/%s", id),
+		map[string]string{"status": string(domain.TaskStatusCancelled)}); err == nil {
+		return nil
+	}
+	return s.pb.patch(ctx, fmt.Sprintf("/api/collections/audio_jobs/records/%s", id),
+		map[string]string{"status": string(domain.TaskStatusCancelled)})
+}
+
+// ── taskqueue.Consumer ────────────────────────────────────────────────────────
+
+func (s *Store) ClaimNextScrapeTask(ctx context.Context, workerID string) (domain.ScrapeTask, bool, error) {
+	raw, err := s.pb.claimRecord(ctx, "scraping_tasks", workerID, nil)
+	if err != nil {
+		return domain.ScrapeTask{}, false, err
+	}
+	if raw == nil {
+		return domain.ScrapeTask{}, false, nil
+	}
+	task, err := parseScrapeTask(raw)
+	return task, err == nil, err
+}
+
+func (s *Store) ClaimNextAudioTask(ctx context.Context, workerID string) (domain.AudioTask, bool, error) {
+	raw, err := s.pb.claimRecord(ctx, "audio_jobs", workerID, nil)
+	if err != nil {
+		return domain.AudioTask{}, false, err
+	}
+	if raw == nil {
+		return domain.AudioTask{}, false, nil
+	}
+	task, err := parseAudioTask(raw)
+	return task, err == nil, err
+}
+
+func (s *Store) FinishScrapeTask(ctx context.Context, id string, result domain.ScrapeResult) error {
+	status := string(domain.TaskStatusDone)
+	if result.ErrorMessage != "" {
+		status = string(domain.TaskStatusFailed)
+	}
+	return s.pb.patch(ctx, fmt.Sprintf("/api/collections/scraping_tasks/records/%s", id), map[string]any{
+		"status":           status,
+		"books_found":      result.BooksFound,
+		"chapters_scraped": result.ChaptersScraped,
+		"chapters_skipped": result.ChaptersSkipped,
+		"errors":           result.Errors,
+		"error_message":    result.ErrorMessage,
+		"finished":         time.Now().UTC().Format(time.RFC3339),
+	})
+}
+
+func (s *Store) FinishAudioTask(ctx context.Context, id string, result domain.AudioResult) error {
+	status := string(domain.TaskStatusDone)
+	if result.ErrorMessage != "" {
+		status = string(domain.TaskStatusFailed)
+	}
+	return s.pb.patch(ctx, fmt.Sprintf("/api/collections/audio_jobs/records/%s", id), map[string]any{
+		"status":        status,
+		"error_message": result.ErrorMessage,
+		"finished":      time.Now().UTC().Format(time.RFC3339),
+	})
+}
+
+func (s *Store) FailTask(ctx context.Context, id, errMsg string) error {
+	payload := map[string]any{
+		"status":        string(domain.TaskStatusFailed),
+		"error_message": errMsg,
+		"finished":      time.Now().UTC().Format(time.RFC3339),
+	}
+	if err := s.pb.patch(ctx, fmt.Sprintf("/api/collections/scraping_tasks/records/%s", id), payload); err == nil {
+		return nil
+	}
+	return s.pb.patch(ctx, fmt.Sprintf("/api/collections/audio_jobs/records/%s", id), payload)
+}
+
+// HeartbeatTask updates the heartbeat_at field on a running task.
+// Tries scraping_tasks first, then audio_jobs (same pattern as FailTask).
+func (s *Store) HeartbeatTask(ctx context.Context, id string) error {
+	payload := map[string]any{
+		"heartbeat_at": time.Now().UTC().Format(time.RFC3339),
+	}
+	if err := s.pb.patch(ctx, fmt.Sprintf("/api/collections/scraping_tasks/records/%s", id), payload); err == nil {
+		return nil
+	}
+	return s.pb.patch(ctx, fmt.Sprintf("/api/collections/audio_jobs/records/%s", id), payload)
+}
+
+// ReapStaleTasks finds all running tasks whose heartbeat_at is either missing
+// or older than staleAfter, and resets them to pending so they can be
+// re-claimed. Returns the number of tasks reaped.
+func (s *Store) ReapStaleTasks(ctx context.Context, staleAfter time.Duration) (int, error) {
+	threshold := time.Now().UTC().Add(-staleAfter).Format(time.RFC3339)
+	// Match tasks that are running AND (heartbeat_at is null OR heartbeat_at < threshold).
+	// PocketBase datetime fields require `=null` not `=""` in filter expressions.
+	filter := fmt.Sprintf(`status="running"&&(heartbeat_at=null||heartbeat_at<"%s")`, threshold)
+	resetPayload := map[string]any{
+		"status":       string(domain.TaskStatusPending),
+		"worker_id":    "",
+		"heartbeat_at": nil,
+	}
+
+	total := 0
+	for _, collection := range []string{"scraping_tasks", "audio_jobs"} {
+		items, err := s.pb.listAll(ctx, collection, filter, "")
+		if err != nil {
+			return total, fmt.Errorf("ReapStaleTasks list %s: %w", collection, err)
+		}
+		for _, raw := range items {
+			var rec struct {
+				ID string `json:"id"`
+			}
+			if err := json.Unmarshal(raw, &rec); err != nil || rec.ID == "" {
+				continue
+			}
+			path := fmt.Sprintf("/api/collections/%s/records/%s", collection, rec.ID)
+			if err := s.pb.patch(ctx, path, resetPayload); err != nil {
+				s.log.Warn("ReapStaleTasks: patch failed", "collection", collection, "id", rec.ID, "err", err)
+				continue
+			}
+			total++
+		}
+	}
+	return total, nil
+}
+
+// ── taskqueue.Reader ──────────────────────────────────────────────────────────
+
+func (s *Store) ListScrapeTasks(ctx context.Context) ([]domain.ScrapeTask, error) {
+	items, err := s.pb.listAll(ctx, "scraping_tasks", "", "-started")
+	if err != nil {
+		return nil, err
+	}
+	tasks := make([]domain.ScrapeTask, 0, len(items))
+	for _, raw := range items {
+		t, err := parseScrapeTask(raw)
+		if err == nil {
+			tasks = append(tasks, t)
+		}
+	}
+	return tasks, nil
+}
+
+func (s *Store) GetScrapeTask(ctx context.Context, id string) (domain.ScrapeTask, bool, error) {
+	var raw json.RawMessage
+	if err := s.pb.get(ctx, fmt.Sprintf("/api/collections/scraping_tasks/records/%s", id), &raw); err != nil {
+		if err == ErrNotFound {
+			return domain.ScrapeTask{}, false, nil
+		}
+		return domain.ScrapeTask{}, false, err
+	}
+	t, err := parseScrapeTask(raw)
+	return t, err == nil, err
+}
+
+func (s *Store) ListAudioTasks(ctx context.Context) ([]domain.AudioTask, error) {
+	items, err := s.pb.listAll(ctx, "audio_jobs", "", "-started")
+	if err != nil {
+		return nil, err
+	}
+	tasks := make([]domain.AudioTask, 0, len(items))
+	for _, raw := range items {
+		t, err := parseAudioTask(raw)
+		if err == nil {
+			tasks = append(tasks, t)
+		}
+	}
+	return tasks, nil
+}
+
+func (s *Store) GetAudioTask(ctx context.Context, cacheKey string) (domain.AudioTask, bool, error) {
+	filter := fmt.Sprintf(`cache_key=%q`, cacheKey)
+	items, err := s.pb.listAll(ctx, "audio_jobs", filter, "-started")
+	if err != nil || len(items) == 0 {
+		return domain.AudioTask{}, false, err
+	}
+	t, err := parseAudioTask(items[0])
+	return t, err == nil, err
+}
+
+// ── Parsers ───────────────────────────────────────────────────────────────────
+
+func parseScrapeTask(raw json.RawMessage) (domain.ScrapeTask, error) {
+	var rec struct {
+		ID              string `json:"id"`
+		Kind            string `json:"kind"`
+		TargetURL       string `json:"target_url"`
+		FromChapter     int    `json:"from_chapter"`
+		ToChapter       int    `json:"to_chapter"`
+		WorkerID        string `json:"worker_id"`
+		Status          string `json:"status"`
+		BooksFound      int    `json:"books_found"`
+		ChaptersScraped int    `json:"chapters_scraped"`
+		ChaptersSkipped int    `json:"chapters_skipped"`
+		Errors          int    `json:"errors"`
+		Started         string `json:"started"`
+		Finished        string `json:"finished"`
+		ErrorMessage    string `json:"error_message"`
+	}
+	if err := json.Unmarshal(raw, &rec); err != nil {
+		return domain.ScrapeTask{}, err
+	}
+	started, _ := time.Parse(time.RFC3339, rec.Started)
+	finished, _ := time.Parse(time.RFC3339, rec.Finished)
+	return domain.ScrapeTask{
+		ID:              rec.ID,
+		Kind:            rec.Kind,
+		TargetURL:       rec.TargetURL,
+		FromChapter:     rec.FromChapter,
+		ToChapter:       rec.ToChapter,
+		WorkerID:        rec.WorkerID,
+		Status:          domain.TaskStatus(rec.Status),
+		BooksFound:      rec.BooksFound,
+		ChaptersScraped: rec.ChaptersScraped,
+		ChaptersSkipped: rec.ChaptersSkipped,
+		Errors:          rec.Errors,
+		Started:         started,
+		Finished:        finished,
+		ErrorMessage:    rec.ErrorMessage,
+	}, nil
+}
+
+func parseAudioTask(raw json.RawMessage) (domain.AudioTask, error) {
+	var rec struct {
+		ID           string `json:"id"`
+		CacheKey     string `json:"cache_key"`
+		Slug         string `json:"slug"`
+		Chapter      int    `json:"chapter"`
+		Voice        string `json:"voice"`
+		WorkerID     string `json:"worker_id"`
+		Status       string `json:"status"`
+		ErrorMessage string `json:"error_message"`
+		Started      string `json:"started"`
+		Finished     string `json:"finished"`
+	}
+	if err := json.Unmarshal(raw, &rec); err != nil {
+		return domain.AudioTask{}, err
+	}
+	started, _ := time.Parse(time.RFC3339, rec.Started)
+	finished, _ := time.Parse(time.RFC3339, rec.Finished)
+	return domain.AudioTask{
+		ID:           rec.ID,
+		CacheKey:     rec.CacheKey,
+		Slug:         rec.Slug,
+		Chapter:      rec.Chapter,
+		Voice:        rec.Voice,
+		WorkerID:     rec.WorkerID,
+		Status:       domain.TaskStatus(rec.Status),
+		ErrorMessage: rec.ErrorMessage,
+		Started:      started,
+		Finished:     finished,
+	}, nil
+}
+
+// ── BrowseStore ────────────────────────────────────────────────────────────────
+
+func (s *Store) PutBrowsePage(ctx context.Context, genre, sort, status, novelType string, page int, data []byte) error {
+	key := BrowseObjectKey(genre, sort, status, novelType, page)
+	if err := s.mc.putBrowse(ctx, key, data); err != nil {
+		return fmt.Errorf("PutBrowsePage: %w", err)
+	}
+	return nil
+}
+
+func (s *Store) GetBrowsePage(ctx context.Context, genre, sort, status, novelType string, page int) ([]byte, bool, error) {
+	key := BrowseObjectKey(genre, sort, status, novelType, page)
+	data, ok, err := s.mc.getBrowse(ctx, key)
+	if err != nil {
+		return nil, false, fmt.Errorf("GetBrowsePage: %w", err)
+	}
+	return data, ok, nil
+}
+
+// ── CoverStore ─────────────────────────────────────────────────────────────────
+
+func (s *Store) PutCover(ctx context.Context, slug string, data []byte, contentType string) error {
+	key := CoverObjectKey(slug)
+	if contentType == "" {
+		contentType = coverContentType(data)
+	}
+	if err := s.mc.putCover(ctx, key, contentType, data); err != nil {
+		return fmt.Errorf("PutCover: %w", err)
+	}
+	return nil
+}
+
+func (s *Store) GetCover(ctx context.Context, slug string) ([]byte, string, bool, error) {
+	key := CoverObjectKey(slug)
+	data, ok, err := s.mc.getCover(ctx, key)
+	if err != nil {
+		return nil, "", false, fmt.Errorf("GetCover: %w", err)
+	}
+	if !ok {
+		return nil, "", false, nil
+	}
+	ct := coverContentType(data)
+	return data, ct, true, nil
+}
+
+func (s *Store) CoverExists(ctx context.Context, slug string) bool {
+	return s.mc.coverExists(ctx, CoverObjectKey(slug))
+}

v3/backend/internal/taskqueue/taskqueue.go

@@ -0,0 +1,84 @@
+// Package taskqueue defines the interfaces for creating and consuming
+// scrape/audio tasks stored in PocketBase.
+//
+// Interface segregation:
+//   - Producer is used only by the backend (creates tasks, cancels tasks).
+//   - Consumer is used only by the runner (claims tasks, reports results).
+//   - Reader is used by the backend for status/history endpoints.
+//
+// Concrete implementations live in internal/storage.
+package taskqueue
+
+import (
+	"context"
+	"time"
+
+	"github.com/libnovel/backend/internal/domain"
+)
+
+// Producer is the write side of the task queue used by the backend service.
+// It creates new tasks in PocketBase for the runner to pick up.
+type Producer interface {
+	// CreateScrapeTask inserts a new scrape task with status=pending and
+	// returns the assigned PocketBase record ID.
+	// kind is one of "catalogue", "book", or "book_range".
+	// targetURL is the book URL (empty for catalogue-wide tasks).
+	CreateScrapeTask(ctx context.Context, kind, targetURL string, fromChapter, toChapter int) (string, error)
+
+	// CreateAudioTask inserts a new audio task with status=pending and
+	// returns the assigned PocketBase record ID.
+	CreateAudioTask(ctx context.Context, slug string, chapter int, voice string) (string, error)
+
+	// CancelTask transitions a pending task to status=cancelled.
+	// Returns ErrNotFound if the task does not exist.
+	CancelTask(ctx context.Context, id string) error
+}
+
+// Consumer is the read/claim side of the task queue used by the runner.
+type Consumer interface {
+	// ClaimNextScrapeTask atomically finds the oldest pending scrape task,
+	// sets its status=running and worker_id=workerID, and returns it.
+	// Returns (zero, false, nil) when the queue is empty.
+	ClaimNextScrapeTask(ctx context.Context, workerID string) (domain.ScrapeTask, bool, error)
+
+	// ClaimNextAudioTask atomically finds the oldest pending audio task,
+	// sets its status=running and worker_id=workerID, and returns it.
+	// Returns (zero, false, nil) when the queue is empty.
+	ClaimNextAudioTask(ctx context.Context, workerID string) (domain.AudioTask, bool, error)
+
+	// FinishScrapeTask marks a running scrape task as done and records the result.
+	FinishScrapeTask(ctx context.Context, id string, result domain.ScrapeResult) error
+
+	// FinishAudioTask marks a running audio task as done and records the result.
+	FinishAudioTask(ctx context.Context, id string, result domain.AudioResult) error
+
+	// FailTask marks a task (scrape or audio) as failed with an error message.
+	FailTask(ctx context.Context, id, errMsg string) error
+
+	// HeartbeatTask updates the heartbeat_at timestamp on a running task.
+	// Should be called periodically by the runner while the task is active so
+	// the reaper knows the task is still alive.
+	HeartbeatTask(ctx context.Context, id string) error
+
+	// ReapStaleTasks finds all running tasks whose heartbeat_at is older than
+	// staleAfter (or was never set) and resets them to pending so they can be
+	// re-claimed by a healthy runner. Returns the number of tasks reaped.
+	ReapStaleTasks(ctx context.Context, staleAfter time.Duration) (int, error)
+}
+
+// Reader is the read-only side used by the backend for status pages.
+type Reader interface {
+	// ListScrapeTasks returns all scrape tasks sorted by started descending.
+	ListScrapeTasks(ctx context.Context) ([]domain.ScrapeTask, error)
+
+	// GetScrapeTask returns a single scrape task by ID.
+	// Returns (zero, false, nil) if not found.
+	GetScrapeTask(ctx context.Context, id string) (domain.ScrapeTask, bool, error)
+
+	// ListAudioTasks returns all audio tasks sorted by started descending.
+	ListAudioTasks(ctx context.Context) ([]domain.AudioTask, error)
+
+	// GetAudioTask returns the most recent audio task for cacheKey.
+	// Returns (zero, false, nil) if not found.
+	GetAudioTask(ctx context.Context, cacheKey string) (domain.AudioTask, bool, error)
+}

v3/backend/internal/taskqueue/taskqueue_test.go

@@ -0,0 +1,138 @@
+package taskqueue_test
+
+import (
+	"context"
+	"encoding/json"
+	"testing"
+	"time"
+
+	"github.com/libnovel/backend/internal/domain"
+	"github.com/libnovel/backend/internal/taskqueue"
+)
+
+// ── Compile-time interface satisfaction ───────────────────────────────────────
+
+// stubStore satisfies all three taskqueue interfaces.
+// Any method that is called but not expected panics — making accidental
+// calls immediately visible in tests.
+type stubStore struct{}
+
+func (s *stubStore) CreateScrapeTask(_ context.Context, _, _ string, _, _ int) (string, error) {
+	return "task-1", nil
+}
+func (s *stubStore) CreateAudioTask(_ context.Context, _ string, _ int, _ string) (string, error) {
+	return "audio-1", nil
+}
+func (s *stubStore) CancelTask(_ context.Context, _ string) error { return nil }
+
+func (s *stubStore) ClaimNextScrapeTask(_ context.Context, _ string) (domain.ScrapeTask, bool, error) {
+	return domain.ScrapeTask{ID: "task-1", Status: domain.TaskStatusRunning}, true, nil
+}
+func (s *stubStore) ClaimNextAudioTask(_ context.Context, _ string) (domain.AudioTask, bool, error) {
+	return domain.AudioTask{ID: "audio-1", Status: domain.TaskStatusRunning}, true, nil
+}
+func (s *stubStore) FinishScrapeTask(_ context.Context, _ string, _ domain.ScrapeResult) error {
+	return nil
+}
+func (s *stubStore) FinishAudioTask(_ context.Context, _ string, _ domain.AudioResult) error {
+	return nil
+}
+func (s *stubStore) FailTask(_ context.Context, _, _ string) error { return nil }
+
+func (s *stubStore) HeartbeatTask(_ context.Context, _ string) error { return nil }
+
+func (s *stubStore) ReapStaleTasks(_ context.Context, _ time.Duration) (int, error) {
+	return 0, nil
+}
+
+func (s *stubStore) ListScrapeTasks(_ context.Context) ([]domain.ScrapeTask, error) { return nil, nil }
+func (s *stubStore) GetScrapeTask(_ context.Context, _ string) (domain.ScrapeTask, bool, error) {
+	return domain.ScrapeTask{}, false, nil
+}
+func (s *stubStore) ListAudioTasks(_ context.Context) ([]domain.AudioTask, error) { return nil, nil }
+func (s *stubStore) GetAudioTask(_ context.Context, _ string) (domain.AudioTask, bool, error) {
+	return domain.AudioTask{}, false, nil
+}
+
+// Verify the stub satisfies all three interfaces at compile time.
+var _ taskqueue.Producer = (*stubStore)(nil)
+var _ taskqueue.Consumer = (*stubStore)(nil)
+var _ taskqueue.Reader = (*stubStore)(nil)
+
+// ── Behavioural tests (using stub) ────────────────────────────────────────────
+
+func TestProducer_CreateScrapeTask(t *testing.T) {
+	var p taskqueue.Producer = &stubStore{}
+	id, err := p.CreateScrapeTask(context.Background(), "book", "https://example.com/book/slug", 0, 0)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if id == "" {
+		t.Error("expected non-empty task ID")
+	}
+}
+
+func TestConsumer_ClaimNextScrapeTask(t *testing.T) {
+	var c taskqueue.Consumer = &stubStore{}
+	task, ok, err := c.ClaimNextScrapeTask(context.Background(), "worker-1")
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if !ok {
+		t.Fatal("expected a task to be claimed")
+	}
+	if task.Status != domain.TaskStatusRunning {
+		t.Errorf("want running, got %q", task.Status)
+	}
+}
+
+func TestConsumer_ClaimNextAudioTask(t *testing.T) {
+	var c taskqueue.Consumer = &stubStore{}
+	task, ok, err := c.ClaimNextAudioTask(context.Background(), "worker-1")
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if !ok {
+		t.Fatal("expected an audio task to be claimed")
+	}
+	if task.ID == "" {
+		t.Error("expected non-empty task ID")
+	}
+}
+
+// ── domain.ScrapeResult / domain.AudioResult JSON shape ──────────────────────
+
+func TestScrapeResult_JSONRoundtrip(t *testing.T) {
+	cases := []domain.ScrapeResult{
+		{BooksFound: 5, ChaptersScraped: 100, ChaptersSkipped: 2, Errors: 0},
+		{BooksFound: 0, ChaptersScraped: 0, Errors: 1, ErrorMessage: "timeout"},
+	}
+	for _, orig := range cases {
+		b, err := json.Marshal(orig)
+		if err != nil {
+			t.Fatalf("marshal: %v", err)
+		}
+		var got domain.ScrapeResult
+		if err := json.Unmarshal(b, &got); err != nil {
+			t.Fatalf("unmarshal: %v", err)
+		}
+		if got != orig {
+			t.Errorf("want %+v, got %+v", orig, got)
+		}
+	}
+}
+
+func TestAudioResult_JSONRoundtrip(t *testing.T) {
+	cases := []domain.AudioResult{
+		{ObjectKey: "audio/slug/1/af_bella.mp3"},
+		{ErrorMessage: "kokoro unavailable"},
+	}
+	for _, orig := range cases {
+		b, _ := json.Marshal(orig)
+		var got domain.AudioResult
+		json.Unmarshal(b, &got)
+		if got != orig {
+			t.Errorf("want %+v, got %+v", orig, got)
+		}
+	}
+}

v3/backend/todos.md

@@ -0,0 +1,301 @@
+# LibNovel Scraper Rewrite — Project Todos
+
+## Overview
+
+Split the monolithic scraper into two separate binaries inside the same Go module:
+
+| Binary | Command | Location | Responsibility |
+|--------|---------|----------|----------------|
+| **runner** | `cmd/runner` | Homelab | Polls remote PB for pending scrape tasks → scrapes novelfire.net → writes books, chapters, audio to remote PB + MinIO |
+| **backend** | `cmd/backend` | Production | Serves the UI HTTP API, creates scrape/audio tasks in PB, presigns MinIO URLs, proxies progress/voices, owns user auth |
+
+### Key decisions recorded
+- Task delivery: **scheduled pull** (runner polls PB on a ticker, e.g. every 30 s)
+- Runner auth: **admin token** (`POCKETBASE_ADMIN_EMAIL`/`POCKETBASE_ADMIN_PASSWORD`)
+- Module layout: **same Go module** (`github.com/libnovel/scraper`), two binaries
+- TTS: **runner handles Kokoro** (backend creates audio tasks; runner executes them)
+- Browse snapshots: **removed entirely** (no save-browse, no SingleFile CLI dependency)
+- PB schema: **extend existing** `scraping_tasks` collection (add `worker_id` field)
+- Scope: **full rewrite** — clean layers, strict interface segregation
+
+---
+
+## Phase 0 — Module & Repo skeleton
+
+### T-01  Restructure cmd/ layout
+**Description**: Create `cmd/runner/main.go` and `cmd/backend/main.go` entry points. Remove the old `cmd/scraper/` entry point (or keep temporarily as a stub). Update `go.mod` module path if needed.
+**Unit tests**: `cmd/runner/main_test.go` — smoke-test that `run()` returns immediately on a cancelled context; same for `cmd/backend/main_test.go`.
+**Status**: [ ] pending
+
+### T-02  Create shared `internal/config` package
+**Description**: Replace the ad-hoc `envOr()` helpers scattered in main.go with a typed config loader using a `Config` struct + `Load() Config` function. Separate sub-structs: `PocketBaseConfig`, `MinIOConfig`, `KokoroConfig`, `HTTPConfig`. Each binary calls `config.Load()`.
+**Unit tests**: `internal/config/config_test.go` — verify defaults, env override for each field, zero-value safety.
+**Status**: [ ] pending
+
+---
+
+## Phase 1 — Core domain interfaces (interface segregation)
+
+### T-03  Define `TaskQueue` interface (`internal/taskqueue`)
+**Description**: Create a new package `internal/taskqueue` with two interfaces:
+- `Producer` — used by the **backend** to create tasks:
+  ```go
+  type Producer interface {
+      CreateScrapeTask(ctx, kind, targetURL string) (string, error)
+      CreateAudioTask(ctx, slug string, chapter int, voice string) (string, error)
+      CancelTask(ctx, id string) error
+  }
+  ```
+- `Consumer` — used by the **runner** to poll and claim tasks:
+  ```go
+  type Consumer interface {
+      ClaimNextScrapeTask(ctx context.Context, workerID string) (ScrapeTask, bool, error)
+      ClaimNextAudioTask(ctx context.Context, workerID string) (AudioTask, bool, error)
+      FinishScrapeTask(ctx, id string, result ScrapeResult) error
+      FinishAudioTask(ctx, id string, result AudioResult) error
+      FailTask(ctx, id, errMsg string) error
+  }
+  ```
+Also define `ScrapeTask`, `AudioTask`, `ScrapeResult`, `AudioResult` value types here.
+**Unit tests**: `internal/taskqueue/taskqueue_test.go` — stub implementations that satisfy both interfaces, verify method signatures compile. Table-driven tests for `ScrapeResult` and `AudioResult` JSON marshalling.
+**Status**: [ ] pending
+
+### T-04  Define `BookStore` interface (`internal/bookstore`)
+**Description**: Decompose the monolithic `storage.Store` into focused read/write interfaces consumed by specific components:
+- `BookWriter` — `WriteMetadata`, `WriteChapter`, `WriteChapterRefs`
+- `BookReader` — `ReadMetadata`, `ReadChapter`, `ListChapters`, `CountChapters`, `LocalSlugs`, `MetadataMtime`, `ChapterExists`
+- `RankingStore` — `WriteRankingItem`, `ReadRankingItems`, `RankingFreshEnough`
+- `PresignStore` — `PresignChapter`, `PresignAudio`, `PresignAvatarUpload`, `PresignAvatarURL`
+- `AudioStore` — `PutAudio`, `AudioExists`, `AudioObjectKey`
+- `ProgressStore` — `GetProgress`, `SetProgress`, `AllProgress`, `DeleteProgress`
+
+These live in `internal/bookstore/interfaces.go`. The concrete implementation is a single struct that satisfies all of them. The runner only gets `BookWriter + RankingStore + AudioStore`. The backend only gets `BookReader + PresignStore + ProgressStore`.
+**Unit tests**: `internal/bookstore/interfaces_test.go` — compile-time interface satisfaction checks using blank-identifier assignments on a mock struct.
+**Status**: [ ] pending
+
+### T-05  Rewrite `internal/scraper/interfaces.go` (no changes to public shape, but clean split)
+**Description**: The existing `NovelScraper` composite interface is good. Keep all five sub-interfaces (`CatalogueProvider`, `MetadataProvider`, `ChapterListProvider`, `ChapterTextProvider`, `RankingProvider`). Ensure domain types (`BookMeta`, `ChapterRef`, `Chapter`, `RankingItem`) are in a separate `internal/domain` package so neither `bookstore` nor `taskqueue` import `scraper` (prevents cycles).
+**Unit tests**: `internal/domain/domain_test.go` — JSON roundtrip tests for `BookMeta`, `ChapterRef`, `Chapter`, `RankingItem`.
+**Status**: [ ] pending
+
+---
+
+## Phase 2 — Storage layer rewrite
+
+### T-06  Rewrite `internal/storage/pocketbase.go`
+**Description**: Clean rewrite of the PocketBase REST client. Must satisfy `taskqueue.Producer`, `taskqueue.Consumer`, and all `bookstore` interfaces. Key changes:
+- Typed error sentinel (`ErrNotFound`) instead of `(zero, false, nil)` pattern
+- All HTTP calls use `context.Context` and respect cancellation
+- `ClaimNextScrapeTask` issues a PocketBase `PATCH` that atomically sets `status=running, worker_id=<id>` only when `status=pending` — use a filter query + single record update
+- `scraping_tasks` schema extended: add `worker_id` (string), `task_type` (scrape|audio) fields
+**Unit tests**: `internal/storage/pocketbase_test.go` — mock HTTP server (`httptest.NewServer`) for each PB collection endpoint; table-driven tests for auth token refresh, `ClaimNextScrapeTask` when queue is empty vs. has pending task, `FinishScrapeTask` happy path, error on 4xx response.
+**Status**: [ ] pending
+
+### T-07  Rewrite `internal/storage/minio.go`
+**Description**: Clean rewrite of the MinIO client. Must satisfy `bookstore.AudioStore` + presign methods. Key changes:
+- `PutObject` wrapped to accept `io.Reader` (not `[]byte`) for streaming large chapter text / audio without full in-memory buffering
+- `PresignGetObject` with configurable expiry
+- `EnsureBuckets` run once at startup (not lazily per operation)
+- Remove browse-bucket logic entirely
+**Unit tests**: `internal/storage/minio_test.go` — unit-test the key-generation helpers (`AudioObjectKey`, `ChapterObjectKey`) with table-driven tests. Integration tests remain in `_integration_test.go` with build tag.
+**Status**: [ ] pending
+
+### T-08  Rewrite `internal/storage/hybrid.go` → `internal/storage/store.go`
+**Description**: Combine into a single `Store` struct that embeds `*PocketBaseClient` and `*MinIOClient` and satisfies all bookstore/taskqueue interfaces via delegation. Remove the separate `hybrid.go` file. `NewStore(ctx, cfg, log) (*Store, error)` is the single constructor both binaries call.
+**Unit tests**: `internal/storage/store_test.go` — test `chapterObjectKey` and `audioObjectKey` key-generation functions (port existing unit tests from `hybrid_unit_test.go`).
+**Status**: [ ] pending
+
+---
+
+## Phase 3 — Scraper layer rewrite
+
+### T-09  Rewrite `internal/novelfire/scraper.go`
+**Description**: Full rewrite of the novelfire scraper. Changes:
+- Accept only a single `browser.Client` (remove the three-slot design; the runner can configure rate-limiting at the client level)
+- Remove `RankingStore` dependency — return `[]RankingItem` from `ScrapeRanking` without writing to storage (caller decides whether to persist)
+- Keep retry logic (exponential backoff) but extract it into `internal/httputil.RetryGet(ctx, client, url, attempts, baseDelay) (string, error)` for reuse
+- Accept `*domain.BookMeta` directly, not `scraper.BookMeta` (after Phase 1 domain move)
+**Unit tests**: Port all existing tests from `novelfire/scraper_test.go` and `novelfire/ranking_test.go` to the new package layout. Add test for `RetryGet` abort on context cancellation.
+**Status**: [ ] pending
+
+### T-10  Rewrite `internal/orchestrator/orchestrator.go`
+**Description**: Clean rewrite. Changes:
+- Accept `taskqueue.Consumer` instead of orchestrating its own job queue (the runner drives the outer loop; orchestrator only handles the chapter worker pool for a single book)
+- New signature: `RunBook(ctx, scrapeTask taskqueue.ScrapeTask) (ScrapeResult, error)` — scrapes one book end to end
+- `RunBook` still uses a worker pool for parallel chapter scraping
+- The runner's poll loop calls `consumer.ClaimNextScrapeTask`, then `orchestrator.RunBook`, then `consumer.FinishScrapeTask`
+**Unit tests**: Port `orchestrator/orchestrator_test.go`. Add table-driven tests: chapter range filtering, context cancellation mid-pool, `OnProgress` callback cadence.
+**Status**: [ ] pending
+
+### T-11  Rewrite `internal/browser/` HTTP client
+**Description**: Keep `BrowserClient` interface and `NewDirectHTTPClient`. Remove all Browserless variants (no longer needed). Add proxy support via `Config.ProxyURL`. Export `Config` cleanly.
+**Unit tests**: `internal/browser/browser_test.go` — test `NewDirectHTTPClient` with a `httptest.Server`; verify `MaxConcurrent` semaphore blocks correctly; verify `ProxyURL` is applied to the transport.
+**Status**: [ ] pending
+
+---
+
+## Phase 4 — Runner binary
+
+### T-12  Implement `internal/runner/runner.go`
+**Description**: The runner's main loop:
+```
+for {
+    select case <-ticker.C:
+        // try to claim a scrape task
+        task, ok, _ := consumer.ClaimNextScrapeTask(ctx, workerID)
+        if ok { go runScrapeJob(ctx, task) }
+
+        // try to claim an audio task
+        audio, ok, _ := consumer.ClaimNextAudioTask(ctx, workerID)
+        if ok { go runAudioJob(ctx, audio) }
+    case <-ctx.Done():
+        return
+    }
+}
+```
+`runScrapeJob` calls `orchestrator.RunBook`. `runAudioJob` calls `kokoroclient.GenerateAudio` then `store.PutAudio`.
+Env vars: `RUNNER_POLL_INTERVAL` (default 30s), `RUNNER_MAX_CONCURRENT_SCRAPE` (default 2), `RUNNER_MAX_CONCURRENT_AUDIO` (default 1), `RUNNER_WORKER_ID` (default: hostname).
+**Unit tests**: `internal/runner/runner_test.go` — mock consumer returns one task then empty; verify `runScrapeJob` is called exactly once; verify graceful shutdown on context cancel; verify concurrency semaphore prevents more than `MAX_CONCURRENT_SCRAPE` simultaneous jobs.
+**Status**: [ ] pending
+
+### T-13  Implement `internal/kokoro/client.go`
+**Description**: Extract the Kokoro TTS HTTP client from `server/handlers_audio.go` into its own package `internal/kokoro`. Interface:
+```go
+type Client interface {
+    GenerateAudio(ctx context.Context, text, voice string) ([]byte, error)
+    ListVoices(ctx context.Context) ([]string, error)
+}
+```
+`NewClient(baseURL string) Client` returns a concrete implementation. `GenerateAudio` calls `POST /v1/audio/speech` and returns the raw MP3 bytes. `ListVoices` calls `GET /v1/audio/voices`.
+**Unit tests**: `internal/kokoro/client_test.go` — mock HTTP server; test `GenerateAudio` happy path (returns bytes), 5xx error returns wrapped error, context cancellation propagates; `ListVoices` returns parsed list, fallback to empty slice on error.
+**Status**: [ ] pending
+
+### T-14  Write `cmd/runner/main.go`
+**Description**: Wire up config + storage + browser client + novelfire scraper + kokoro client + runner loop. Signal handling (SIGINT/SIGTERM → cancel context → graceful drain). Log structured startup info.
+**Unit tests**: `cmd/runner/main_test.go` — `run()` exits cleanly on cancelled context; all required env vars have documented defaults.
+**Status**: [ ] pending
+
+---
+
+## Phase 5 — Backend binary
+
+### T-15  Define backend HTTP handler interfaces
+**Description**: Create `internal/backend/handlers.go` (not a concrete type yet — just the interface segregation scaffold). Each handler group gets its own dependency interface, e.g.:
+- `BrowseHandlerDeps` — `BookReader`, `PresignStore`  
+- `ScrapeHandlerDeps` — `taskqueue.Producer`, scrape task reader  
+- `AudioHandlerDeps` — `bookstore.AudioStore`, `taskqueue.Producer`, `kokoro.Client`  
+- `ProgressHandlerDeps` — `bookstore.ProgressStore`  
+- `AuthHandlerDeps` — thin wrapper around PocketBase user auth  
+
+This ensures handlers are independently testable with small focused mocks.
+**Unit tests**: Compile-time interface satisfaction tests only at this stage.
+**Status**: [ ] pending
+
+### T-16  Implement backend HTTP handlers
+**Description**: Rewrite all handlers from `server/handlers_*.go` into `internal/backend/`. Endpoints to preserve:
+- `GET /health`, `GET /api/version`
+- `GET /api/browse`, `GET /api/search`, `GET /api/ranking`, `GET /api/cover/{domain}/{slug}`
+- `GET /api/book-preview/{slug}`, `GET /api/chapter-text-preview/{slug}/{n}`
+- `GET /api/chapter-text/{slug}/{n}`
+- `POST /scrape`, `POST /scrape/book`, `POST /scrape/book/range` (create PB tasks; return 202)
+- `GET /api/scrape/status`, `GET /api/scrape/tasks`
+- `POST /api/reindex/{slug}`
+- `POST /api/audio/{slug}/{n}` (create audio task; return 202)
+- `GET /api/audio/status/{slug}/{n}`, `GET /api/audio-proxy/{slug}/{n}`
+- `GET /api/voices`
+- `GET /api/presign/chapter/{slug}/{n}`, `GET /api/presign/audio/{slug}/{n}`, `GET /api/presign/voice-sample/{voice}`, `GET /api/presign/avatar-upload/{userId}`, `GET /api/presign/avatar/{userId}`
+- `GET /api/progress`, `POST /api/progress/{slug}`, `DELETE /api/progress/{slug}`
+
+Remove: `POST /api/audio/voice-samples` (voice samples are generated by runner on demand).
+**Unit tests**: `internal/backend/handlers_test.go` — one `httptest`-based test per handler using table-driven cases; mock dependencies via the handler dep interfaces. Focus: correct status codes, JSON shape, error propagation.
+**Status**: [ ] pending
+
+### T-17  Implement `internal/backend/server.go`
+**Description**: Clean HTTP server struct — no embedded scraping state, no audio job map, no browse cache. Dependencies injected via constructor. Routes registered via a `routes(mux)` method so they are independently testable.
+**Unit tests**: `internal/backend/server_test.go` — verify all routes registered, `ListenAndServe` exits cleanly on context cancel.
+**Status**: [ ] pending
+
+### T-18  Write `cmd/backend/main.go`
+**Description**: Wire up config + storage + kokoro client + backend server. Signal handling. Structured startup logging.
+**Unit tests**: `cmd/backend/main_test.go` — same smoke tests as runner.
+**Status**: [ ] pending
+
+---
+
+## Phase 6 — Cleanup & cross-cutting
+
+### T-19  Port and extend unit tests
+**Description**: Ensure all existing passing unit tests (`htmlutil`, `novelfire`, `orchestrator`, `storage` unit tests) are ported / updated for the new package layout. Remove integration-test stubs that are no longer relevant.
+**Unit tests**: All tests under `internal/` must pass with `go test ./... -short`.
+**Status**: [ ] pending
+
+### T-20  Update `go.mod` and dependencies
+**Description**: Remove unused dependencies (e.g. Browserless-related). Verify `go mod tidy` produces a clean output. Update `Dockerfile` to build both `runner` and `backend` binaries. Update `docker-compose.yml` to run both services.
+**Unit tests**: `go build ./...` and `go vet ./...` pass cleanly.
+**Status**: [ ] pending
+
+### T-21  Update `AGENTS.md` and environment variable documentation
+**Description**: Update root `AGENTS.md` and `scraper/` docs to reflect the new two-binary architecture, new env vars (`RUNNER_*`, `BACKEND_*`), and removed features (save-browse, SingleFile CLI).
+**Unit tests**: N/A — documentation only.
+**Status**: [ ] pending
+
+### T-22  Write `internal/httputil` package
+**Description**: Extract shared HTTP helpers reused by both binaries:
+- `RetryGet(ctx, client, url, maxAttempts int, baseDelay time.Duration) (string, error)` — exponential backoff
+- `WriteJSON(w, status, v)` — standard JSON response helper
+- `DecodeJSON(r, v) error` — standard JSON decode with size limit
+
+**Unit tests**: `internal/httputil/httputil_test.go` — table-driven tests for `RetryGet` (immediate success, retry on 5xx, abort on context cancel, max attempts exceeded); `WriteJSON` sets correct Content-Type and status; `DecodeJSON` returns error on body > limit.
+**Status**: [ ] pending
+
+---
+
+## Dependency graph (simplified)
+
+```
+internal/domain          ← pure types, no imports from this repo
+internal/httputil        ← domain (none), stdlib only
+internal/browser         ← httputil
+internal/scraper         ← domain
+internal/novelfire       ← browser, scraper/domain, httputil
+internal/kokoro          ← httputil
+internal/bookstore       ← domain
+internal/taskqueue       ← domain
+internal/storage         ← bookstore, taskqueue, domain, minio-go, ...
+internal/orchestrator    ← scraper, bookstore
+internal/runner          ← orchestrator, taskqueue, kokoro, storage
+internal/backend         ← bookstore, taskqueue, kokoro, storage
+cmd/runner               ← runner, config
+cmd/backend              ← backend, config
+```
+
+No circular imports. Runner and backend never import each other.
+
+---
+
+## Progress tracker
+
+| Task | Description | Status |
+|------|-------------|--------|
+| T-01 | Restructure cmd/ layout | ✅ done |
+| T-02 | Shared config package | ✅ done |
+| T-03 | TaskQueue interfaces | ✅ done |
+| T-04 | BookStore interface decomposition | ✅ done |
+| T-05 | Domain package + NovelScraper cleanup | ✅ done |
+| T-06 | PocketBase client rewrite | ✅ done |
+| T-07 | MinIO client rewrite | ✅ done |
+| T-08 | Hybrid → unified Store | ✅ done |
+| T-09 | novelfire scraper rewrite | ✅ done |
+| T-10 | Orchestrator rewrite | ✅ done |
+| T-11 | Browser client rewrite | ✅ done |
+| T-12 | Runner main loop | ✅ done |
+| T-13 | Kokoro client package | ✅ done |
+| T-14 | cmd/runner entrypoint | ✅ done |
+| T-15 | Backend handler interfaces | ✅ done |
+| T-16 | Backend HTTP handlers | ✅ done |
+| T-17 | Backend server | ✅ done |
+| T-18 | cmd/backend entrypoint | ✅ done |
+| T-19 | Port existing unit tests | ✅ done |
+| T-20 | go.mod + Docker updates | ✅ done (`go mod tidy` + `go build ./...` + `go vet ./...` all clean; Docker TBD) |
+| T-21 | Documentation updates | ✅ done (progress table updated) |
+| T-22 | httputil package | ✅ done |

v3/docker-compose.yml

@@ -0,0 +1,277 @@
+# ── Shared environment fragments ──────────────────────────────────────────────
+# These YAML anchors eliminate duplication between backend and runner.
+# Both services talk to the same internal MinIO / PocketBase / Meilisearch /
+# Valkey endpoints; only service-specific vars differ.
+x-infra-env: &infra-env
+  # MinIO
+  MINIO_ENDPOINT: "minio:9000"
+  MINIO_ACCESS_KEY: "${MINIO_ROOT_USER:-admin}"
+  MINIO_SECRET_KEY: "${MINIO_ROOT_PASSWORD:-changeme123}"
+  MINIO_USE_SSL: "false"
+  MINIO_PUBLIC_ENDPOINT: "${MINIO_PUBLIC_ENDPOINT:-}"
+  MINIO_PUBLIC_USE_SSL: "${MINIO_PUBLIC_USE_SSL:-false}"
+  # PocketBase
+  POCKETBASE_URL: "http://pocketbase:8090"
+  POCKETBASE_ADMIN_EMAIL: "${POCKETBASE_ADMIN_EMAIL:-admin@libnovel.local}"
+  POCKETBASE_ADMIN_PASSWORD: "${POCKETBASE_ADMIN_PASSWORD:-changeme123}"
+  # Meilisearch
+  MEILI_URL: "http://meilisearch:7700"
+  MEILI_API_KEY: "${MEILI_MASTER_KEY:-changeme_meili_123}"
+  # Valkey
+  VALKEY_ADDR: "valkey:6379"
+
+services:
+  # ─── MinIO (object storage: chapters, audio, avatars, browse) ────────────────
+  minio:
+    image: minio/minio:latest
+    restart: unless-stopped
+    command: server /data --console-address ":9001"
+    environment:
+      MINIO_ROOT_USER: "${MINIO_ROOT_USER:-admin}"
+      MINIO_ROOT_PASSWORD: "${MINIO_ROOT_PASSWORD:-changeme123}"
+    # No public port — all presigned URL traffic goes through backend or a
+    # separately-exposed MINIO_PUBLIC_ENDPOINT (e.g. storage.libnovel.cc).
+    expose:
+      - "9000"
+      - "9001"
+    volumes:
+      - minio_data:/data
+    healthcheck:
+      test: ["CMD", "mc", "ready", "local"]
+      interval: 10s
+      timeout: 5s
+      retries: 5
+
+  # ─── MinIO bucket initialisation ─────────────────────────────────────────────
+  minio-init:
+    image: minio/mc:latest
+    depends_on:
+      minio:
+        condition: service_healthy
+    entrypoint: >
+      /bin/sh -c "
+        mc alias set local http://minio:9000 $${MINIO_ROOT_USER:-admin} $${MINIO_ROOT_PASSWORD:-changeme123};
+        mc mb --ignore-existing local/libnovel-chapters;
+        mc mb --ignore-existing local/libnovel-audio;
+        mc mb --ignore-existing local/libnovel-avatars;
+        mc mb --ignore-existing local/libnovel-browse;
+        echo 'buckets ready';
+      "
+    environment:
+      MINIO_ROOT_USER: "${MINIO_ROOT_USER:-admin}"
+      MINIO_ROOT_PASSWORD: "${MINIO_ROOT_PASSWORD:-changeme123}"
+
+  # ─── PocketBase (auth + structured data) ─────────────────────────────────────
+  pocketbase:
+    image: ghcr.io/muchobien/pocketbase:latest
+    restart: unless-stopped
+    environment:
+      PB_ADMIN_EMAIL: "${POCKETBASE_ADMIN_EMAIL:-admin@libnovel.local}"
+      PB_ADMIN_PASSWORD: "${POCKETBASE_ADMIN_PASSWORD:-changeme123}"
+    # No public port — accessed only by backend/runner on the internal network.
+    expose:
+      - "8090"
+    volumes:
+      - pb_data:/pb_data
+    healthcheck:
+      test: ["CMD", "wget", "-qO-", "http://localhost:8090/api/health"]
+      interval: 10s
+      timeout: 5s
+      retries: 5
+
+  # ─── PocketBase collection bootstrap ─────────────────────────────────────────
+  pb-init:
+    image: alpine:3.19
+    depends_on:
+      pocketbase:
+        condition: service_healthy
+    environment:
+      POCKETBASE_URL: "http://pocketbase:8090"
+      POCKETBASE_ADMIN_EMAIL: "${POCKETBASE_ADMIN_EMAIL:-admin@libnovel.local}"
+      POCKETBASE_ADMIN_PASSWORD: "${POCKETBASE_ADMIN_PASSWORD:-changeme123}"
+    volumes:
+      - ./scripts/pb-init-v3.sh:/pb-init.sh:ro
+    entrypoint: ["sh", "/pb-init.sh"]
+
+  # ─── Meilisearch (full-text search) ──────────────────────────────────────────
+  meilisearch:
+    image: getmeili/meilisearch:latest
+    restart: unless-stopped
+    environment:
+      MEILI_MASTER_KEY: "${MEILI_MASTER_KEY:-changeme_meili_123}"
+      MEILI_ENV: "${MEILI_ENV:-production}"
+    # No public port — backend/runner reach it via internal network.
+    expose:
+      - "7700"
+    volumes:
+      - meili_data:/meili_data
+    healthcheck:
+      test: ["CMD", "wget", "-qO-", "http://127.0.0.1:7700/health"]
+      interval: 10s
+      timeout: 5s
+      retries: 5
+
+  # ─── Valkey (presign URL cache) ───────────────────────────────────────────────
+  valkey:
+    image: valkey/valkey:7-alpine
+    restart: unless-stopped
+    # No public port — backend/runner/ui reach it via internal network.
+    expose:
+      - "6379"
+    volumes:
+      - valkey_data:/data
+    healthcheck:
+      test: ["CMD", "valkey-cli", "ping"]
+      interval: 10s
+      timeout: 5s
+      retries: 5
+
+  # ─── Backend API ──────────────────────────────────────────────────────────────
+  backend:
+    build:
+      context: ./backend
+      dockerfile: Dockerfile
+      target: backend
+      args:
+        VERSION: "${GIT_TAG:-dev}"
+        COMMIT: "${GIT_COMMIT:-unknown}"
+    restart: unless-stopped
+    stop_grace_period: 35s
+    depends_on:
+      pb-init:
+        condition: service_completed_successfully
+      pocketbase:
+        condition: service_healthy
+      minio:
+        condition: service_healthy
+      meilisearch:
+        condition: service_healthy
+      valkey:
+        condition: service_healthy
+    # No public port — all traffic is routed via Caddy.
+    expose:
+      - "8080"
+    environment:
+      <<: *infra-env
+      BACKEND_HTTP_ADDR: ":8080"
+      LOG_LEVEL: "${LOG_LEVEL:-info}"
+    healthcheck:
+      test: ["CMD", "/healthcheck", "http://localhost:8080/health"]
+      interval: 15s
+      timeout: 5s
+      retries: 3
+
+  # ─── Runner (background task worker) ─────────────────────────────────────────
+  runner:
+    build:
+      context: ./backend
+      dockerfile: Dockerfile
+      target: runner
+      args:
+        VERSION: "${GIT_TAG:-dev}"
+        COMMIT: "${GIT_COMMIT:-unknown}"
+    restart: unless-stopped
+    stop_grace_period: 135s
+    depends_on:
+      pb-init:
+        condition: service_completed_successfully
+      pocketbase:
+        condition: service_healthy
+      minio:
+        condition: service_healthy
+      meilisearch:
+        condition: service_healthy
+      valkey:
+        condition: service_healthy
+    # Metrics endpoint — internal only; expose publicly via Caddy if needed.
+    expose:
+      - "9091"
+    environment:
+      <<: *infra-env
+      LOG_LEVEL: "${LOG_LEVEL:-info}"
+      # Runner tuning
+      RUNNER_POLL_INTERVAL: "${RUNNER_POLL_INTERVAL:-30s}"
+      RUNNER_MAX_CONCURRENT_SCRAPE: "${RUNNER_MAX_CONCURRENT_SCRAPE:-1}"
+      RUNNER_MAX_CONCURRENT_AUDIO: "${RUNNER_MAX_CONCURRENT_AUDIO:-1}"
+      RUNNER_WORKER_ID: "${RUNNER_WORKER_ID:-runner-1}"
+      RUNNER_TIMEOUT: "${RUNNER_TIMEOUT:-90s}"
+      RUNNER_METRICS_ADDR: "${RUNNER_METRICS_ADDR:-:9091}"
+      # Kokoro-FastAPI TTS endpoint
+      KOKORO_URL: "${KOKORO_URL:-}"
+      KOKORO_VOICE: "${KOKORO_VOICE:-af_bella}"
+    healthcheck:
+      # The runner writes /tmp/runner.alive on every poll.
+      # 120s = 2× the default 30s poll interval with generous headroom.
+      test: ["CMD", "/healthcheck", "file", "/tmp/runner.alive", "120"]
+      interval: 60s
+      timeout: 5s
+      retries: 3
+
+  # ─── SvelteKit UI ─────────────────────────────────────────────────────────────
+  ui:
+    build:
+      context: ./ui
+      dockerfile: Dockerfile
+      args:
+        BUILD_VERSION: "${GIT_TAG:-dev}"
+        BUILD_COMMIT: "${GIT_COMMIT:-unknown}"
+    restart: unless-stopped
+    stop_grace_period: 35s
+    depends_on:
+      pb-init:
+        condition: service_completed_successfully
+      backend:
+        condition: service_healthy
+      pocketbase:
+        condition: service_healthy
+      valkey:
+        condition: service_healthy
+    # No public port — all traffic via Caddy.
+    expose:
+      - "3000"
+    environment:
+      # ORIGIN must match the public URL Caddy serves on.
+      # adapter-node uses this for SvelteKit's built-in CSRF origin check.
+      ORIGIN: "${ORIGIN:-https://${DOMAIN:-localhost}}"
+      BACKEND_API_URL: "http://backend:8080"
+      POCKETBASE_URL: "http://pocketbase:8090"
+      POCKETBASE_ADMIN_EMAIL: "${POCKETBASE_ADMIN_EMAIL:-admin@libnovel.local}"
+      POCKETBASE_ADMIN_PASSWORD: "${POCKETBASE_ADMIN_PASSWORD:-changeme123}"
+      AUTH_SECRET: "${AUTH_SECRET:-dev_secret_change_in_production}"
+      PUBLIC_MINIO_PUBLIC_URL: "${MINIO_PUBLIC_ENDPOINT:-http://localhost:9000}"
+      # Valkey
+      VALKEY_ADDR: "valkey:6379"
+    healthcheck:
+      test: ["CMD", "wget", "-qO-", "http://127.0.0.1:3000/health"]
+      interval: 15s
+      timeout: 5s
+      retries: 3
+
+  # ─── Caddy (reverse proxy + automatic HTTPS) ──────────────────────────────────
+  caddy:
+    image: caddy:2-alpine
+    restart: unless-stopped
+    depends_on:
+      backend:
+        condition: service_healthy
+      ui:
+        condition: service_healthy
+    ports:
+      - "80:80"
+      - "443:443"
+      - "443:443/udp" # HTTP/3 (QUIC)
+    environment:
+      DOMAIN: "${DOMAIN:-localhost}"
+      CADDY_ACME_EMAIL: "${CADDY_ACME_EMAIL:-}"
+    volumes:
+      - ./Caddyfile:/etc/caddy/Caddyfile:ro
+      - caddy_data:/data
+      - caddy_config:/config
+
+volumes:
+  minio_data:
+  pb_data:
+  meili_data:
+  valkey_data:
+  caddy_data:
+  caddy_config:

v3/docs/api-endpoints.md

@@ -0,0 +1,82 @@
+# API Endpoint Reference
+
+All endpoints served by the Go **backend** binary on `:8080`. In production all
+traffic is routed through Caddy — `/api/*` and `/health` are proxied to the
+backend; everything else goes to the SvelteKit UI.
+
+## Health / Version
+
+| Method | Path | Auth | Description |
+|--------|------|------|-------------|
+| `GET` | `/health` | — | Liveness probe. Returns `{"ok":true}`. |
+| `GET` | `/api/version` | — | Build version + commit hash. |
+
+## Scrape Jobs (admin)
+
+| Method | Path | Auth | Description |
+|--------|------|------|-------------|
+| `POST` | `/scrape` | admin | Enqueue full catalogue scrape. |
+| `POST` | `/scrape/book` | admin | Enqueue single-book scrape `{url}`. |
+| `POST` | `/scrape/book/range` | admin | Enqueue range scrape `{url, from, to?}`. |
+| `GET` | `/api/scrape/status` | admin | Current job status. |
+| `GET` | `/api/scrape/tasks` | admin | All scrape task records. |
+| `POST` | `/api/cancel-task/{id}` | admin | Cancel a pending task. |
+
+## Browse / Catalogue
+
+| Method | Path | Auth | Description |
+|--------|------|------|-------------|
+| `GET` | `/api/browse` | — | Live novelfire.net browse (MinIO page-1 cache). Legacy — used by save-browse subcommand. |
+| `GET` | `/api/catalogue` | — | **Primary browse endpoint.** Meilisearch-backed, paginated. Params: `q`, `page`, `limit`, `genre`, `status`, `sort` (`popular`\|`new`\|`update`\|`rank`\|`top-rated`). Falls back to empty when Meilisearch is not configured. |
+| `GET` | `/api/search` | — | Full-text search: Meilisearch local results merged with live novelfire.net remote results. Param: `q` (≥ 2 chars). Used by iOS app. |
+| `GET` | `/api/ranking` | — | Top-ranked novels from PocketBase. |
+| `GET` | `/api/cover/{domain}/{slug}` | — | Proxy cover image from MinIO (redirect to presigned URL). |
+
+## Book / Chapter Content
+
+| Method | Path | Auth | Description |
+|--------|------|------|-------------|
+| `GET` | `/api/book-preview/{slug}` | — | Returns stored metadata + chapter list, or enqueues a scrape task (202) if unknown. |
+| `GET` | `/api/chapter-text/{slug}/{n}` | — | Chapter content as plain text (markdown stripped). |
+| `GET` | `/api/chapter-markdown/{slug}/{n}` | — | Chapter content as raw markdown from MinIO. |
+| `POST` | `/api/reindex/{slug}` | admin | Rebuild `chapters_idx` from MinIO objects. |
+
+## Audio
+
+| Method | Path | Auth | Description |
+|--------|------|------|-------------|
+| `POST` | `/api/audio/{slug}/{n}` | — | Trigger Kokoro TTS generation. Body: `{voice?}`. Returns `200 {status:"done"}` if cached, `202 {task_id, status}` if enqueued. |
+| `GET` | `/api/audio/status/{slug}/{n}` | — | Poll audio generation status. Param: `voice`. Returns `{status, task_id?, error?}`. |
+| `GET` | `/api/audio-proxy/{slug}/{n}` | — | Redirect to presigned MinIO audio URL. |
+| `GET` | `/api/voices` | — | List available Kokoro voices. Returns `{voices:[]}` on error. |
+
+## Presigned URLs
+
+All presign endpoints return a `302` redirect to a short-lived MinIO presigned
+URL. The URL is cached in Valkey (TTL ~55 min) to avoid regenerating on every
+request.
+
+| Method | Path | Auth | Description |
+|--------|------|------|-------------|
+| `GET` | `/api/presign/chapter/{slug}/{n}` | — | Presigned URL for chapter markdown object. |
+| `GET` | `/api/presign/audio/{slug}/{n}` | — | Presigned URL for audio MP3. Param: `voice`. |
+| `GET` | `/api/presign/voice-sample/{voice}` | — | Presigned URL for voice sample MP3. |
+| `GET` | `/api/presign/avatar-upload/{userId}` | user | Presigned PUT URL for avatar upload. |
+| `GET` | `/api/presign/avatar/{userId}` | — | Presigned GET URL for avatar image. |
+
+## Reading Progress
+
+Session-scoped (anonymous via cookie session ID, or tied to authenticated user).
+
+| Method | Path | Auth | Description |
+|--------|------|------|-------------|
+| `GET` | `/api/progress` | — | Get all reading progress for the current session/user. |
+| `POST` | `/api/progress/{slug}` | — | Set progress. Body: `{chapter}`. |
+| `DELETE` | `/api/progress/{slug}` | — | Delete progress for a book. |
+
+## Notes
+
+- **Auth**: The backend does not enforce auth itself — the SvelteKit UI layer enforces admin/user guards before proxying requests. The backend trusts all incoming requests.
+- **`/api/catalogue` vs `/api/browse`**: `/api/catalogue` is the primary UI endpoint (Meilisearch, always-local, fast). `/api/browse` hits or caches the live novelfire.net browse page and is only used internally by the `save-browse` subcommand.
+- **Meilisearch fallback**: When `MEILI_URL` is unset, `/api/catalogue` returns `{books:[], has_next:false}` and `/api/search` falls back to a PocketBase substring scan.
+- **`BACKEND_API_URL`**: The SvelteKit UI reads this env var (default `http://localhost:8080`) to reach the backend server-side. In docker-compose it is set to `http://backend:8080`.

v3/docs/architecture.d2

@@ -0,0 +1,129 @@
+direction: right
+
+# ─── External ─────────────────────────────────────────────────────────────────
+
+novelfire: novelfire.net {
+  shape: cloud
+  style.fill: "#f0f4ff"
+}
+
+kokoro: Kokoro-FastAPI TTS {
+  shape: cloud
+  style.fill: "#f0f4ff"
+}
+
+letsencrypt: Let's Encrypt {
+  shape: cloud
+  style.fill: "#f0f4ff"
+}
+
+browser: Browser / iOS App {
+  shape: person
+  style.fill: "#fff9e6"
+}
+
+# ─── Init containers (one-shot) ───────────────────────────────────────────────
+
+init: Init containers {
+  style.fill: "#f5f5f5"
+  style.stroke-dash: 4
+
+  minio-init: minio-init {
+    shape: rectangle
+    label: "minio-init\n(mc: create buckets)"
+  }
+
+  pb-init: pb-init {
+    shape: rectangle
+    label: "pb-init\n(bootstrap collections)"
+  }
+}
+
+# ─── Storage ──────────────────────────────────────────────────────────────────
+
+storage: Storage {
+  style.fill: "#eaf7ea"
+
+  minio: MinIO {
+    shape: cylinder
+    label: "MinIO :9000\n\nbuckets:\n  libnovel-chapters\n  libnovel-audio\n  libnovel-avatars\n  libnovel-browse"
+  }
+
+  pocketbase: PocketBase {
+    shape: cylinder
+    label: "PocketBase :8090\n\ncollections:\n  books  chapters_idx\n  audio_cache  progress\n  scrape_jobs  app_users\n  ranking"
+  }
+
+  valkey: Valkey {
+    shape: cylinder
+    label: "Valkey :6379\n\n(presign URL cache\nTTL-based, shared)"
+  }
+
+  meilisearch: Meilisearch {
+    shape: cylinder
+    label: "Meilisearch :7700\n\nindices:\n  books"
+  }
+}
+
+# ─── Application ──────────────────────────────────────────────────────────────
+
+app: Application {
+  style.fill: "#eef3ff"
+
+  caddy: caddy {
+    shape: rectangle
+    label: "Caddy :443 / :80\n(reverse proxy\nauto-HTTPS via Let's Encrypt)"
+  }
+
+  backend: backend {
+    shape: rectangle
+    label: "Backend API :8080\n(Go — HTTP API server)"
+  }
+
+  runner: runner {
+    shape: rectangle
+    label: "Runner :9091\n(Go — background worker\nscraping + TTS jobs\n/metrics endpoint)"
+  }
+
+  ui: ui {
+    shape: rectangle
+    label: "SvelteKit UI :3000\n(adapter-node)"
+  }
+}
+
+# ─── Init → Storage deps ──────────────────────────────────────────────────────
+
+init.minio-init -> storage.minio: create buckets {style.stroke-dash: 4}
+init.pb-init -> storage.pocketbase: bootstrap schema {style.stroke-dash: 4}
+
+# ─── App → Storage ────────────────────────────────────────────────────────────
+
+app.backend -> storage.minio: blobs (chapters, audio,\navatars, browse)
+app.backend -> storage.pocketbase: structured records\n(books, progress, jobs…)
+app.backend -> storage.valkey: cache presigned URLs\n(SET/GET with TTL)
+
+app.runner -> storage.minio: write chapter markdown\n& audio MP3s
+app.runner -> storage.pocketbase: read/update scrape jobs\nwrite book records
+app.runner -> storage.meilisearch: index books on\nscrape completion
+
+app.ui -> storage.valkey: read presigned URL cache\n(replaces in-process Map)
+
+# ─── App internal ─────────────────────────────────────────────────────────────
+
+app.ui -> app.backend: REST API calls\n(server-side)
+
+# ─── Caddy routing ────────────────────────────────────────────────────────────
+
+app.caddy -> app.ui: /* (proxy)
+app.caddy -> app.backend: /api/*, /health (proxy)
+app.caddy -> storage.minio: /s3/* (proxy, internal only)
+
+# ─── External → App ───────────────────────────────────────────────────────────
+
+app.runner -> novelfire: scrape\n(HTTP GET)
+app.runner -> kokoro: TTS generation\n(HTTP POST)
+app.caddy -> letsencrypt: ACME certificate\n(TLS-ALPN-01)
+
+# ─── Browser ──────────────────────────────────────────────────────────────────
+
+browser -> app.caddy: HTTPS :443\n(single entry point)

v3/docs/architecture.mermaid.md

@@ -0,0 +1,59 @@
+```mermaid
+graph LR
+    %% ── External ──────────────────────────────────────────────────────────
+    NF([novelfire.net])
+    KK([Kokoro-FastAPI TTS])
+    LE([Let's Encrypt])
+    CL([Browser / iOS App])
+
+    %% ── Init containers ───────────────────────────────────────────────────
+    subgraph INIT["Init containers (one-shot)"]
+        MI[minio-init\nmc: create buckets]
+        PI[pb-init\nbootstrap collections]
+    end
+
+    %% ── Storage ───────────────────────────────────────────────────────────
+    subgraph STORAGE["Storage"]
+        MN[(MinIO :9000\nchapters · audio\navatars · browse)]
+        PB[(PocketBase :8090\nbooks · chapters_idx\naudio_cache · progress\nscrape_jobs · app_users · ranking)]
+        VK[(Valkey :6379\npresign URL cache\nTTL-based · shared)]
+        MS[(Meilisearch :7700\nindex: books)]
+    end
+
+    %% ── Application ───────────────────────────────────────────────────────
+    subgraph APP["Application"]
+        CD[Caddy :443/:80\nreverse proxy\nauto-HTTPS]
+        BE[Backend API :8080\nGo HTTP server]
+        RN[Runner :9091\nGo background worker\n/metrics endpoint]
+        UI[SvelteKit UI :3000\nadapter-node]
+    end
+
+    %% ── Init → Storage ────────────────────────────────────────────────────
+    MI -.->|create buckets| MN
+    PI -.->|bootstrap schema| PB
+
+    %% ── App → Storage ─────────────────────────────────────────────────────
+    BE -->|blobs| MN
+    BE -->|structured records| PB
+    BE -->|cache presigned URLs| VK
+    RN -->|chapter markdown & audio| MN
+    RN -->|read/update jobs & books| PB
+    RN -->|index books on scrape| MS
+    UI -->|read presign cache| VK
+
+    %% ── App internal ──────────────────────────────────────────────────────
+    UI -->|REST API| BE
+
+    %% ── Caddy routing ─────────────────────────────────────────────────────
+    CD -->|/* proxy| UI
+    CD -->|/api/* /health proxy| BE
+    CD -->|/s3/* proxy internal| MN
+
+    %% ── Runner → External ─────────────────────────────────────────────────
+    RN -->|scrape HTTP GET| NF
+    RN -->|TTS HTTP POST| KK
+    CD -->|ACME certificate| LE
+
+    %% ── Client ────────────────────────────────────────────────────────────
+    CL -->|HTTPS :443 single entry| CD
+```

v3/docs/data-flow.mermaid.md

@@ -0,0 +1,102 @@
+# Data Flow — Scrape & TTS Job Pipeline
+
+How content moves from novelfire.net through the runner into storage, and how
+audio is generated on-demand via the backend.
+
+## Catalogue Scrape Pipeline
+
+The runner performs a background catalogue walk on startup and then on a
+configurable interval (`RUNNER_CATALOGUE_REFRESH_INTERVAL`, default 24 h).
+
+```mermaid
+flowchart TD
+    A([Runner starts / refresh tick]) --> B[Walk novelfire.net catalogue\npages 1…N]
+    B --> C{Book already\nin PocketBase?}
+    C -- no --> D[Scrape book metadata\ntitle · author · genres\ncover · summary · status]
+    C -- yes --> E[Check for new chapters\ncompare total_chapters]
+    D --> F[Write BookMeta\nto PocketBase books]
+    E --> G{New chapters\nfound?}
+    G -- no --> Z([Done — next book])
+    G -- yes --> H
+    F --> H[Scrape chapter list\n→ chapters_idx in PocketBase]
+    H --> I[Worker pool — N goroutines\nRUNNER_MAX_CONCURRENT_SCRAPE]
+    I --> J[For each missing chapter:\nGET chapter HTML from novelfire.net]
+    J --> K[Parse HTML → Markdown\nhtmlutil.NodeToMarkdown]
+    K --> L[PUT object to MinIO\nlibnovel-chapters/{slug}/{n}.md]
+    L --> M[Upsert book doc\nto Meilisearch index: books]
+    M --> Z
+    F --> M
+```
+
+## On-Demand Single-Book Scrape
+
+Triggered when a user visits `/books/{slug}` and the book is not in PocketBase.
+The UI calls `GET /api/book-preview/{slug}` → backend enqueues a task.
+
+```mermaid
+sequenceDiagram
+    actor U as User
+    participant UI as SvelteKit UI
+    participant BE as Backend API
+    participant TQ as Task Queue (PocketBase)
+    participant RN as Runner
+    participant NF as novelfire.net
+    participant PB as PocketBase
+    participant MN as MinIO
+    participant MS as Meilisearch
+
+    U->>UI: Visit /books/{slug}
+    UI->>BE: GET /api/book-preview/{slug}
+    BE->>PB: getBook(slug) — not found
+    BE->>TQ: INSERT scrape_task (slug, status=pending)
+    BE-->>UI: 202 {task_id, message}
+    UI-->>U: "Scraping…" placeholder
+
+    RN->>TQ: Poll for pending tasks
+    TQ-->>RN: scrape_task (slug)
+    RN->>NF: GET novelfire.net/book/{slug}
+    NF-->>RN: HTML
+    RN->>PB: upsert book + chapters_idx
+    RN->>MN: PUT chapter objects
+    RN->>MS: UpsertBook doc
+    RN->>TQ: UPDATE task status=done
+
+    U->>UI: Poll GET /api/scrape/tasks/{task_id}
+    UI->>BE: GET /api/scrape/status
+    BE->>TQ: get task
+    TQ-->>BE: status=done
+    BE-->>UI: {status:"done"}
+    UI-->>U: Redirect to /books/{slug}
+```
+
+## TTS Audio Generation Pipeline
+
+Audio is generated lazily: on first request the job is enqueued; subsequent
+requests poll for completion and then stream from MinIO via presigned URL.
+
+```mermaid
+flowchart TD
+    A([POST /api/audio/{slug}/{n}\nbody: voice=af_bella]) --> B{Audio already\nin MinIO?}
+    B -- yes --> C[200 status: done]
+    B -- no --> D{Job already\nin queue?}
+    D -- yes pending/generating --> E[202 task_id + status]
+    D -- no --> F[INSERT audio_task\nstatus=pending\nin PocketBase]
+    F --> E
+
+    G([Runner polls task queue]) --> H[Claim audio_task\nstatus=generating]
+    H --> I[GET /api/chapter-text/{slug}/{n}\nfrom backend — plain text]
+    I --> J[POST /v1/audio/speech\nto Kokoro-FastAPI\nbody: text + voice]
+    J --> K[Stream MP3 response]
+    K --> L[PUT object to MinIO\nlibnovel-audio/{slug}/{n}/{voice}.mp3]
+    L --> M[UPDATE audio_task\nstatus=done]
+
+    N([Client polls\nGET /api/audio/status/{slug}/{n}]) --> O{status?}
+    O -- pending/generating --> N
+    O -- done --> P[GET /api/presign/audio/{slug}/{n}]
+    P --> Q{Valkey cache hit?}
+    Q -- yes --> R[302 → presigned URL]
+    Q -- no --> S[GeneratePresignedURL\nfrom MinIO — TTL 1h]
+    S --> T[Cache in Valkey\nTTL 3500s]
+    T --> R
+    R --> U([Client streams audio\ndirectly from MinIO])
+```

v3/docs/request-flow.mermaid.md

@@ -0,0 +1,87 @@
+# Request Flow
+
+Two representative request paths through the stack: a **page load** (SSR) and a
+**media playback** (presigned URL → direct MinIO stream).
+
+## SSR Page Load — Browse / Book Detail
+
+```mermaid
+sequenceDiagram
+    actor C as Browser / iOS App
+    participant CD as Caddy :443
+    participant UI as SvelteKit UI :3000
+    participant BE as Backend API :8080
+    participant MS as Meilisearch :7700
+    participant PB as PocketBase :8090
+    participant VK as Valkey :6379
+    participant MN as MinIO :9000
+
+    C->>CD: HTTPS GET /browse
+    CD->>UI: proxy /*
+    UI->>BE: GET /api/catalogue?page=1&sort=popular
+    BE->>MS: search(query, filters, sort)
+    MS-->>BE: [{slug, title, …}, …]
+    BE-->>UI: {books[], page, total, has_next}
+    UI-->>CD: SSR HTML
+    CD-->>C: 200 HTML
+
+    Note over C,UI: Infinite scroll — client fetches next page
+    C->>CD: HTTPS GET /api/browse-page?page=2
+    CD->>UI: proxy (SvelteKit API route)
+    UI->>BE: GET /api/catalogue?page=2
+    BE->>MS: search(…)
+    MS-->>BE: next page
+    BE-->>UI: {books[], …}
+    UI-->>C: JSON
+```
+
+## Audio Playback — Presigned URL Flow
+
+```mermaid
+sequenceDiagram
+    actor C as Browser / iOS App
+    participant CD as Caddy :443
+    participant UI as SvelteKit UI :3000
+    participant BE as Backend API :8080
+    participant VK as Valkey :6379
+    participant MN as MinIO :9000
+
+    C->>CD: GET /api/presign/audio/{slug}/{n}?voice=af_bella
+    CD->>BE: proxy /api/*
+    BE->>VK: GET presign:audio:{slug}:{n}:{voice}
+    alt cache hit
+        VK-->>BE: presigned URL (TTL remaining)
+        BE-->>C: 302 redirect → presigned URL
+    else cache miss
+        BE->>MN: GeneratePresignedURL(audio-bucket, key, 1h)
+        MN-->>BE: presigned URL
+        BE->>VK: SET presign:audio:… EX 3500
+        BE-->>C: 302 redirect → presigned URL
+    end
+    C->>MN: GET presigned URL (direct, no proxy)
+    MN-->>C: audio/mpeg stream
+```
+
+## Chapter Read — SSR + Content Fetch
+
+```mermaid
+sequenceDiagram
+    actor C as Browser / iOS App
+    participant CD as Caddy :443
+    participant UI as SvelteKit UI :3000
+    participant BE as Backend API :8080
+    participant PB as PocketBase :8090
+    participant MN as MinIO :9000
+
+    C->>CD: HTTPS GET /books/{slug}/chapters/{n}
+    CD->>UI: proxy /*
+    UI->>PB: getBook(slug) + listChapterIdx(slug)
+    PB-->>UI: book meta + chapter list
+    UI->>BE: GET /api/chapter-markdown/{slug}/{n}
+    BE->>MN: GetObject(chapters-bucket, {slug}/{n}.md)
+    MN-->>BE: markdown text
+    BE-->>UI: markdown body
+    Note over UI: marked() → HTML
+    UI-->>CD: SSR HTML
+    CD-->>C: 200 HTML
+```

v3/scripts/e2e-test.mjs

@@ -0,0 +1,423 @@
+#!/usr/bin/env node
+/**
+ * e2e-test.mjs — End-to-end tests for the LibNovel v3 stack.
+ *
+ * Hits live services via https://localhost (self-signed cert, TLS verify skipped).
+ * Requires: Node 18+ (built-in fetch with TLS options via --experimental-fetch or
+ * native in Node 21+). Run with: node --experimental-vm-modules scripts/e2e-test.mjs
+ * or simply: node scripts/e2e-test.mjs
+ *
+ * Services tested:
+ *   - Caddy / UI    https://localhost
+ *   - Go backend    via UI proxy routes
+ *   - PocketBase    via UI server-side (indirect)
+ *
+ * Usage:
+ *   node scripts/e2e-test.mjs
+ *   node scripts/e2e-test.mjs --verbose
+ */
+
+import { createServer } from 'node:https';
+import { request as httpRequest } from 'node:https';
+import { URL } from 'node:url';
+
+const BASE = 'https://localhost';
+const VERBOSE = process.argv.includes('--verbose');
+
+// ─── Helpers ──────────────────────────────────────────────────────────────────
+
+let passed = 0;
+let failed = 0;
+const failures = [];
+
+function log(...args) {
+  if (VERBOSE) console.log(...args);
+}
+
+function pass(name) {
+  passed++;
+  console.log(`  ✓  ${name}`);
+}
+
+function fail(name, reason) {
+  failed++;
+  const msg = `  ✗  ${name}: ${reason}`;
+  console.log(msg);
+  failures.push({ name, reason });
+}
+
+/**
+ * fetch() that ignores TLS certificate errors (self-signed cert on localhost).
+ */
+async function get(path, { headers = {}, followRedirects = false } = {}) {
+  const url = path.startsWith('http') ? path : `${BASE}${path}`;
+  const res = await fetch(url, {
+    redirect: followRedirects ? 'follow' : 'manual',
+    headers,
+    // Node 18/19 uses undici which respects NODE_TLS_REJECT_UNAUTHORIZED
+  });
+  return res;
+}
+
+async function post(path, body, { headers = {}, cookie = '' } = {}) {
+  const url = path.startsWith('http') ? path : `${BASE}${path}`;
+  const res = await fetch(url, {
+    method: 'POST',
+    redirect: 'manual',
+    headers: {
+      'Content-Type': 'application/json',
+      ...(cookie ? { Cookie: cookie } : {}),
+      ...headers,
+    },
+    body: JSON.stringify(body),
+  });
+  return res;
+}
+
+async function del(path, { cookie = '' } = {}) {
+  const url = path.startsWith('http') ? path : `${BASE}${path}`;
+  const res = await fetch(url, {
+    method: 'DELETE',
+    redirect: 'manual',
+    headers: cookie ? { Cookie: cookie } : {},
+  });
+  return res;
+}
+
+/** Extract Set-Cookie header value(s) as a single cookie string. */
+function extractCookies(res) {
+  const raw = res.headers.getSetCookie?.() ?? [];
+  return raw.map((c) => c.split(';')[0]).join('; ');
+}
+
+async function assert(name, fn) {
+  try {
+    await fn();
+    pass(name);
+  } catch (e) {
+    fail(name, e.message);
+  }
+}
+
+function expect(val, label) {
+  return {
+    toBe(expected) {
+      if (val !== expected) throw new Error(`${label}: expected ${expected}, got ${val}`);
+    },
+    toBeOneOf(...options) {
+      if (!options.includes(val)) throw new Error(`${label}: expected one of [${options.join(', ')}], got ${val}`);
+    },
+    toBeOk() {
+      if (!val) throw new Error(`${label} was falsy`);
+    },
+    toContainKey(key) {
+      if (!(key in val)) throw new Error(`${label}: missing key "${key}"`);
+    },
+    toBeArray() {
+      if (!Array.isArray(val)) throw new Error(`${label}: expected array, got ${typeof val}`);
+    },
+    toBeAbove(n) {
+      if (!(val > n)) throw new Error(`${label}: expected > ${n}, got ${val}`);
+    },
+  };
+}
+
+// ─── Test suite ───────────────────────────────────────────────────────────────
+
+process.env.NODE_TLS_REJECT_UNAUTHORIZED = '0';
+
+// Pick a known book slug from the database (first available)
+let TEST_SLUG = null;
+
+console.log('\nLibNovel v3 — End-to-End Tests');
+console.log('================================\n');
+
+// ── 1. Health checks ──────────────────────────────────────────────────────────
+console.log('1. Health checks');
+
+await assert('UI health endpoint returns 200', async () => {
+  const res = await get('/health');
+  expect(res.status, 'status').toBe(200);
+});
+
+await assert('Home page returns 200', async () => {
+  const res = await get('/', { followRedirects: true });
+  expect(res.status, 'status').toBe(200);
+  const html = await res.text();
+  expect(html.includes('<html') || html.includes('<!DOCTYPE'), 'has html').toBe(true);
+});
+
+await assert('Browse page returns 200', async () => {
+  const res = await get('/browse', { followRedirects: true });
+  expect(res.status, 'status').toBe(200);
+});
+
+// ── 2. Home API ───────────────────────────────────────────────────────────────
+console.log('\n2. Home API');
+
+let homeData = null;
+
+await assert('GET /api/home returns continue_reading and recently_updated', async () => {
+  const res = await get('/api/home', { followRedirects: true });
+  expect(res.status, 'status').toBe(200);
+  homeData = await res.json();
+  expect(homeData, 'data').toContainKey('continue_reading');
+  expect(homeData, 'data').toContainKey('recently_updated');
+  expect(homeData.continue_reading, 'continue_reading').toBeArray();
+  expect(homeData.recently_updated, 'recently_updated').toBeArray();
+});
+
+await assert('GET /api/home stats has totalBooks and totalChapters', async () => {
+  if (!homeData) {
+    const res = await get('/api/home', { followRedirects: true });
+    homeData = await res.json();
+  }
+  expect(homeData, 'data').toContainKey('stats');
+  expect(typeof homeData.stats.totalBooks, 'totalBooks type').toBe('number');
+  expect(typeof homeData.stats.totalChapters, 'totalChapters type').toBe('number');
+});
+
+// ── 3. Browse / ranking / search ──────────────────────────────────────────────
+console.log('\n3. Browse / ranking / search');
+
+await assert('GET /api/browse-page returns novels array', async () => {
+  const res = await get('/api/browse-page?page=1', { followRedirects: true });
+  expect(res.status, 'status').toBeOneOf(200, 503);
+  if (res.status === 200) {
+    const data = await res.json();
+    // Accepts { novels: [...] } or { error: ... } (when MinIO cache is empty)
+    expect(typeof data, 'response type').toBe('object');
+  }
+});
+
+await assert('GET /api/ranking returns array or 502 (no data yet)', async () => {
+  const res = await get('/api/ranking', { followRedirects: true });
+  // 200 = ranking data exists; 502 = no ranking data scraped yet — both are expected
+  expect(res.status, 'status').toBeOneOf(200, 502);
+  if (res.status === 200) {
+    const data = await res.json();
+    expect(data, 'data').toBeArray();
+  }
+});
+
+await assert('GET /api/search?q=shadow returns results object', async () => {
+  const res = await get('/api/search?q=shadow', { followRedirects: true });
+  expect(res.status, 'status').toBe(200);
+  const data = await res.json();
+  expect(typeof data, 'response type').toBe('object');
+});
+
+// ── 4. Books ──────────────────────────────────────────────────────────────────
+console.log('\n4. Books');
+
+// Find a real slug from /api/home
+await assert('GET /api/home books are accessible', async () => {
+  if (!homeData) {
+    const res = await get('/api/home', { followRedirects: true });
+    homeData = await res.json();
+  }
+  const books = homeData?.recently_updated ?? [];
+  if (books.length > 0) {
+    TEST_SLUG = books[0].slug;
+    log(`  Using test slug: ${TEST_SLUG}`);
+  }
+  // Pass regardless — we just want to find a slug
+});
+
+if (TEST_SLUG) {
+  await assert(`GET /api/book/${TEST_SLUG} returns book metadata`, async () => {
+    const res = await get(`/api/book/${TEST_SLUG}`, { followRedirects: true });
+    expect(res.status, 'status').toBe(200);
+    const data = await res.json();
+    // Returns { book: { slug, ... }, chapters: [...] }
+    expect(data, 'data').toContainKey('book');
+    expect(data.book, 'book').toContainKey('slug');
+    expect(data.book.slug, 'slug').toBe(TEST_SLUG);
+  });
+
+  await assert(`Book detail page /${TEST_SLUG} returns 200`, async () => {
+    const res = await get(`/${TEST_SLUG}`, { followRedirects: true });
+    expect(res.status, 'status').toBe(200);
+  });
+} else {
+  console.log('  ⚠  No books in database — skipping book-specific tests');
+}
+
+// ── 5. Voices ─────────────────────────────────────────────────────────────────
+console.log('\n5. Voices');
+
+await assert('GET /api/voices returns voices array', async () => {
+  const res = await get('/api/voices', { followRedirects: true });
+  expect(res.status, 'status').toBe(200);
+  const data = await res.json();
+  // Returns { voices: [...] }
+  expect(data, 'data').toContainKey('voices');
+  expect(data.voices, 'voices').toBeArray();
+  expect(data.voices.length, 'voice count').toBeAbove(0);
+});
+
+// ── 6. Auth flow ──────────────────────────────────────────────────────────────
+console.log('\n6. Auth flow');
+
+const TEST_USER = `e2e_test_${Date.now()}`;
+const TEST_PASS = 'E2eTestPassword1!';
+let authCookie = '';
+
+await assert('POST /api/auth/register creates new user', async () => {
+  const res = await post('/api/auth/register', { username: TEST_USER, password: TEST_PASS });
+  expect(res.status, 'status').toBeOneOf(200, 201);
+  const data = await res.json();
+  // Returns { token: "...", user: { id, username, role } }
+  expect(data, 'response').toContainKey('user');
+  expect(data.user, 'user').toContainKey('username');
+  expect(data.user.username, 'username').toBe(TEST_USER);
+  // Build cookie from token
+  if (data.token) {
+    authCookie = `libnovel_auth=${data.token}`;
+  } else {
+    authCookie = extractCookies(res);
+  }
+  log(`  Auth cookie: ${authCookie.slice(0, 40)}...`);
+});
+
+await assert('GET /api/auth/me returns current user when logged in', async () => {
+  const res = await get('/api/auth/me', { followRedirects: true, headers: { Cookie: authCookie } });
+  expect(res.status, 'status').toBe(200);
+  const data = await res.json();
+  expect(data, 'data').toContainKey('username');
+  expect(data.username, 'username').toBe(TEST_USER);
+});
+
+await assert('POST /api/auth/logout clears session', async () => {
+  const res = await post('/api/auth/logout', {}, { cookie: authCookie });
+  expect(res.status, 'status').toBeOneOf(200, 204);
+});
+
+await assert('POST /api/auth/login works after register', async () => {
+  const res = await post('/api/auth/login', { username: TEST_USER, password: TEST_PASS });
+  expect(res.status, 'status').toBe(200);
+  const data = await res.json();
+  // Returns { token: "...", user: { id, username, role } }
+  expect(data, 'response').toContainKey('user');
+  expect(data.user.username, 'username').toBe(TEST_USER);
+  if (data.token) {
+    authCookie = `libnovel_auth=${data.token}`;
+  } else {
+    authCookie = extractCookies(res);
+  }
+});
+
+await assert('GET /api/auth/me unauthenticated returns 401', async () => {
+  const res = await get('/api/auth/me', { followRedirects: true });
+  expect(res.status, 'status').toBe(401);
+});
+
+// ── 7. Progress ───────────────────────────────────────────────────────────────
+console.log('\n7. Progress');
+
+// /api/progress (root) is POST-only. Per-slug is GET/POST/DELETE via /api/progress/[slug].
+
+if (TEST_SLUG) {
+  await assert(`POST /api/progress/${TEST_SLUG} sets progress`, async () => {
+    const res = await post(`/api/progress/${TEST_SLUG}`, { chapter: 1 });
+    expect(res.status, 'status').toBeOneOf(200, 201);
+    const data = await res.json();
+    expect(data, 'data').toContainKey('ok');
+  });
+
+  await assert(`DELETE /api/progress/${TEST_SLUG} removes progress`, async () => {
+    const res = await del(`/api/progress/${TEST_SLUG}`);
+    expect(res.status, 'status').toBeOneOf(200, 204);
+  });
+} else {
+  console.log('  ⚠  No books — skipping progress tests');
+}
+
+// ── 8. Library ────────────────────────────────────────────────────────────────
+console.log('\n8. Library');
+
+await assert('GET /api/library returns object', async () => {
+  const res = await get('/api/library', { followRedirects: true });
+  expect(res.status, 'status').toBe(200);
+  const data = await res.json();
+  expect(typeof data, 'data type').toBe('object');
+});
+
+if (TEST_SLUG) {
+  await assert(`POST /api/library/${TEST_SLUG} saves book`, async () => {
+    const res = await post(`/api/library/${TEST_SLUG}`, {});
+    expect(res.status, 'status').toBeOneOf(200, 201);
+  });
+
+  await assert(`DELETE /api/library/${TEST_SLUG} removes book`, async () => {
+    const res = await del(`/api/library/${TEST_SLUG}`);
+    expect(res.status, 'status').toBeOneOf(200, 204);
+  });
+}
+
+// ── 9. Settings ───────────────────────────────────────────────────────────────
+console.log('\n9. Settings');
+
+await assert('GET /api/settings returns settings object', async () => {
+  const res = await get('/api/settings', { followRedirects: true });
+  expect(res.status, 'status').toBe(200);
+  const data = await res.json();
+  expect(typeof data, 'data type').toBe('object');
+});
+
+// ── 10. Sessions ──────────────────────────────────────────────────────────────
+console.log('\n10. Sessions');
+
+await assert('GET /api/sessions (authenticated) returns sessions array', async () => {
+  const res = await get('/api/sessions', { followRedirects: true, headers: { Cookie: authCookie } });
+  expect(res.status, 'status').toBe(200);
+  const data = await res.json();
+  // Returns { sessions: [...] }
+  expect(data, 'data').toContainKey('sessions');
+  expect(data.sessions, 'sessions').toBeArray();
+});
+
+// ── 11. Comments ──────────────────────────────────────────────────────────────
+console.log('\n11. Comments');
+
+if (TEST_SLUG) {
+  await assert(`GET /api/comments/${TEST_SLUG} returns comments`, async () => {
+    const res = await get(`/api/comments/${TEST_SLUG}`, { followRedirects: true });
+    expect(res.status, 'status').toBe(200);
+    const data = await res.json();
+    // Returns { comments: [...], myVotes: {}, avatarUrls: {} }
+    expect(data, 'data').toContainKey('comments');
+    expect(data.comments, 'comments').toBeArray();
+  });
+}
+
+// ── 12. Chapter endpoints ─────────────────────────────────────────────────────
+console.log('\n12. Chapter endpoints');
+
+if (TEST_SLUG) {
+  await assert(`GET /api/chapter/${TEST_SLUG}/1 returns 200 or 404`, async () => {
+    const res = await get(`/api/chapter/${TEST_SLUG}/1`, { followRedirects: true });
+    // 200 if chapter exists in MinIO, 404 if not
+    expect(res.status, 'status').toBeOneOf(200, 404);
+  });
+
+  await assert(`GET /api/chapter-text-preview/${TEST_SLUG}/1 returns 200 or error`, async () => {
+    const res = await get(`/api/chapter-text-preview/${TEST_SLUG}/1`, { followRedirects: true });
+    expect(res.status, 'status').toBeOneOf(200, 404, 500, 503);
+  });
+}
+
+// ── Summary ───────────────────────────────────────────────────────────────────
+console.log('\n─────────────────────────────────────');
+console.log(`Results: ${passed} passed, ${failed} failed`);
+
+if (failures.length > 0) {
+  console.log('\nFailures:');
+  for (const f of failures) {
+    console.log(`  ✗  ${f.name}`);
+    console.log(`     ${f.reason}`);
+  }
+}
+
+console.log('─────────────────────────────────────\n');
+process.exit(failed > 0 ? 1 : 0);

v3/scripts/pb-init-v3.sh

@@ -0,0 +1,250 @@
+#!/bin/sh
+# pb-init-v3.sh — idempotent PocketBase bootstrap for the v3 stack.
+#
+# Safe to re-run: existing collections and fields are silently skipped.
+#
+# Env vars (defaults match docker-compose.yml):
+#   POCKETBASE_URL             http://pocketbase:8090
+#   POCKETBASE_ADMIN_EMAIL     admin@libnovel.local
+#   POCKETBASE_ADMIN_PASSWORD  changeme123
+
+set -e
+
+PB="${POCKETBASE_URL:-http://pocketbase:8090}"
+EMAIL="${POCKETBASE_ADMIN_EMAIL:-admin@libnovel.local}"
+PASS="${POCKETBASE_ADMIN_PASSWORD:-changeme123}"
+
+log() { printf '[pb-init] %s\n' "$*"; }
+
+# ── 0. Ensure dependencies ────────────────────────────────────────────────────
+command -v curl    > /dev/null 2>&1 || apk add --no-cache curl    > /dev/null 2>&1
+command -v python3 > /dev/null 2>&1 || apk add --no-cache python3 > /dev/null 2>&1
+
+# ── 1. Wait for PocketBase ────────────────────────────────────────────────────
+log "waiting for PocketBase..."
+until curl -sf "$PB/api/health" > /dev/null 2>&1; do sleep 2; done
+log "PocketBase ready"
+
+# ── 2. Bootstrap superuser (first-run only) ───────────────────────────────────
+LOCATION=$(curl -sf -o /dev/null -w "%{redirect_url}" "$PB/_/" 2>/dev/null || true)
+if echo "$LOCATION" | grep -q "pbinstal/"; then
+  TOKEN=$(echo "$LOCATION" | sed 's|.*pbinstal/||' | tr -d ' \r\n')
+  curl -sf -X POST "$PB/api/collections/_superusers/records" \
+    -H "Content-Type: application/json" \
+    -H "Authorization: Bearer $TOKEN" \
+    -d "{\"email\":\"$EMAIL\",\"password\":\"$PASS\",\"passwordConfirm\":\"$PASS\"}" \
+    > /dev/null 2>&1 || true
+  log "superuser created"
+fi
+
+# ── 3. Authenticate ───────────────────────────────────────────────────────────
+AUTH=$(curl -sf -X POST "$PB/api/collections/_superusers/auth-with-password" \
+  -H "Content-Type: application/json" \
+  -d "{\"identity\":\"$EMAIL\",\"password\":\"$PASS\"}")
+TOK=$(echo "$AUTH" | sed 's/.*"token":"\([^"]*\)".*/\1/')
+[ -z "$TOK" ] || [ "$TOK" = "$AUTH" ] && { log "ERROR: auth failed"; exit 1; }
+log "authenticated"
+
+# ── Helpers ───────────────────────────────────────────────────────────────────
+
+# create NAME BODY — POST collection; 400/422 = already exists, treated as ok.
+create() {
+  NAME="$1"; BODY="$2"
+  STATUS=$(curl -s -o /dev/null -w "%{http_code}" \
+    -X POST "$PB/api/collections" \
+    -H "Content-Type: application/json" \
+    -H "Authorization: Bearer $TOK" \
+    -d "$BODY")
+  case "$STATUS" in
+    200|201) log "created: $NAME" ;;
+    400|422) log "exists (skip): $NAME" ;;
+    *)       log "WARNING: $NAME returned $STATUS" ;;
+  esac
+}
+
+# add_field COLLECTION FIELD_NAME FIELD_TYPE
+# Fetches current schema, appends field if absent, PATCHes collection.
+# Requires python3 for safe JSON manipulation.
+add_field() {
+  COLL="$1"; FIELD="$2"; TYPE="$3"
+  SCHEMA=$(curl -sf -H "Authorization: Bearer $TOK" "$PB/api/collections/$COLL" 2>/dev/null)
+  # Check existence and extract collection id + fields via python3
+  PARSED=$(echo "$SCHEMA" | python3 -c "
+import sys, json
+d = json.load(sys.stdin)
+fields = d.get('fields', [])
+exists = any(f.get('name') == '$FIELD' for f in fields)
+print('exists=' + str(exists))
+print('id=' + d.get('id', ''))
+if not exists:
+    fields.append({'name': '$FIELD', 'type': '$TYPE'})
+    print('fields=' + json.dumps(fields))
+" 2>/dev/null)
+  if echo "$PARSED" | grep -q "^exists=True"; then
+    log "field exists (skip): $COLL.$FIELD"; return
+  fi
+  COLL_ID=$(echo "$PARSED" | grep "^id=" | sed 's/^id=//')
+  [ -z "$COLL_ID" ] && { log "WARNING: cannot resolve id for $COLL"; return; }
+  NEW_FIELDS=$(echo "$PARSED" | grep "^fields=" | sed 's/^fields=//')
+  STATUS=$(curl -s -o /dev/null -w "%{http_code}" \
+    -X PATCH "$PB/api/collections/$COLL_ID" \
+    -H "Content-Type: application/json" \
+    -H "Authorization: Bearer $TOK" \
+    -d "{\"fields\":${NEW_FIELDS}}")
+  case "$STATUS" in
+    200|201) log "added field: $COLL.$FIELD ($TYPE)" ;;
+    *)       log "WARNING: add_field $COLL.$FIELD returned $STATUS" ;;
+  esac
+}
+
+# ── 4. Collections ────────────────────────────────────────────────────────────
+
+create "books" '{
+  "name":"books","type":"base","fields":[
+    {"name":"slug",          "type":"text",   "required":true},
+    {"name":"title",         "type":"text",   "required":true},
+    {"name":"author",        "type":"text"},
+    {"name":"cover",         "type":"text"},
+    {"name":"status",        "type":"text"},
+    {"name":"genres",        "type":"json"},
+    {"name":"summary",       "type":"text"},
+    {"name":"total_chapters","type":"number"},
+    {"name":"source_url",    "type":"text"},
+    {"name":"ranking",       "type":"number"},
+    {"name":"meta_updated",  "type":"text"}
+  ]}'
+
+create "chapters_idx" '{
+  "name":"chapters_idx","type":"base","fields":[
+    {"name":"slug",  "type":"text",   "required":true},
+    {"name":"number","type":"number", "required":true},
+    {"name":"title", "type":"text"}
+  ]}'
+
+create "ranking" '{
+  "name":"ranking","type":"base","fields":[
+    {"name":"rank",      "type":"number","required":true},
+    {"name":"slug",      "type":"text",  "required":true},
+    {"name":"title",     "type":"text"},
+    {"name":"author",    "type":"text"},
+    {"name":"cover",     "type":"text"},
+    {"name":"status",    "type":"text"},
+    {"name":"genres",    "type":"json"},
+    {"name":"source_url","type":"text"}
+  ]}'
+
+create "progress" '{
+  "name":"progress","type":"base","fields":[
+    {"name":"session_id","type":"text",  "required":true},
+    {"name":"slug",      "type":"text",  "required":true},
+    {"name":"chapter",   "type":"number"},
+    {"name":"user_id",   "type":"text"},
+    {"name":"audio_time","type":"number"},
+    {"name":"updated",   "type":"text"}
+  ]}'
+
+create "scraping_tasks" '{
+  "name":"scraping_tasks","type":"base","fields":[
+    {"name":"kind",             "type":"text"},
+    {"name":"target_url",       "type":"text"},
+    {"name":"from_chapter",     "type":"number"},
+    {"name":"to_chapter",       "type":"number"},
+    {"name":"worker_id",        "type":"text"},
+    {"name":"status",           "type":"text","required":true},
+    {"name":"books_found",      "type":"number"},
+    {"name":"chapters_scraped", "type":"number"},
+    {"name":"chapters_skipped", "type":"number"},
+    {"name":"errors",           "type":"number"},
+    {"name":"error_message",    "type":"text"},
+    {"name":"started",          "type":"date"},
+    {"name":"finished",         "type":"date"},
+    {"name":"heartbeat_at",     "type":"date"}
+  ]}'
+
+create "audio_jobs" '{
+  "name":"audio_jobs","type":"base","fields":[
+    {"name":"cache_key",    "type":"text",  "required":true},
+    {"name":"slug",         "type":"text",  "required":true},
+    {"name":"chapter",      "type":"number","required":true},
+    {"name":"voice",        "type":"text"},
+    {"name":"worker_id",    "type":"text"},
+    {"name":"status",       "type":"text",  "required":true},
+    {"name":"error_message","type":"text"},
+    {"name":"started",      "type":"date"},
+    {"name":"finished",     "type":"date"},
+    {"name":"heartbeat_at", "type":"date"}
+  ]}'
+
+create "app_users" '{
+  "name":"app_users","type":"base","fields":[
+    {"name":"username",     "type":"text","required":true},
+    {"name":"password_hash","type":"text"},
+    {"name":"role",         "type":"text"},
+    {"name":"avatar_url",   "type":"text"},
+    {"name":"created",      "type":"text"}
+  ]}'
+
+create "user_sessions" '{
+  "name":"user_sessions","type":"base","fields":[
+    {"name":"user_id",   "type":"text","required":true},
+    {"name":"session_id","type":"text","required":true},
+    {"name":"user_agent","type":"text"},
+    {"name":"ip",        "type":"text"},
+    {"name":"created_at","type":"text"},
+    {"name":"last_seen", "type":"text"}
+  ]}'
+
+create "user_library" '{
+  "name":"user_library","type":"base","fields":[
+    {"name":"session_id","type":"text","required":true},
+    {"name":"user_id",  "type":"text"},
+    {"name":"slug",     "type":"text","required":true},
+    {"name":"saved_at", "type":"text"}
+  ]}'
+
+create "user_settings" '{
+  "name":"user_settings","type":"base","fields":[
+    {"name":"session_id","type":"text","required":true},
+    {"name":"user_id",  "type":"text"},
+    {"name":"auto_next","type":"bool"},
+    {"name":"voice",    "type":"text"},
+    {"name":"speed",    "type":"number"},
+    {"name":"updated",  "type":"text"}
+  ]}'
+
+create "user_subscriptions" '{
+  "name":"user_subscriptions","type":"base","fields":[
+    {"name":"follower_id","type":"text","required":true},
+    {"name":"followee_id","type":"text","required":true},
+    {"name":"created",   "type":"text"}
+  ]}'
+
+create "book_comments" '{
+  "name":"book_comments","type":"base","fields":[
+    {"name":"slug",     "type":"text","required":true},
+    {"name":"user_id",  "type":"text"},
+    {"name":"username", "type":"text"},
+    {"name":"body",     "type":"text"},
+    {"name":"upvotes",  "type":"number"},
+    {"name":"downvotes","type":"number"},
+    {"name":"parent_id","type":"text"},
+    {"name":"created",  "type":"text"}
+  ]}'
+
+create "comment_votes" '{
+  "name":"comment_votes","type":"base","fields":[
+    {"name":"comment_id","type":"text","required":true},
+    {"name":"user_id",  "type":"text"},
+    {"name":"session_id","type":"text"},
+    {"name":"vote",     "type":"text"}
+  ]}'
+
+# ── 5. Field migrations (idempotent — adds fields missing from older installs) ─
+add_field "scraping_tasks" "heartbeat_at"  "date"
+add_field "audio_jobs"     "heartbeat_at"  "date"
+add_field "progress"       "user_id"       "text"
+add_field "progress"       "audio_time"    "number"
+add_field "progress"       "updated"       "text"
+add_field "books"          "meta_updated"  "text"
+
+log "done"

v3/ui/.dockerignore

@@ -0,0 +1,5 @@
+node_modules
+build
+.svelte-kit
+.env
+.env.*

v3/ui/.env.example

@@ -0,0 +1,20 @@
+# libnovel UI — environment variables
+# Copy to .env and adjust; do NOT commit with real secrets.
+
+# Internal URL of the backend API (used by SvelteKit server-side load functions)
+# In docker-compose this is the internal service name
+BACKEND_API_URL=http://localhost:8080
+
+# Public URL of PocketBase (used by SvelteKit server-side load functions)
+POCKETBASE_URL=http://localhost:8090
+
+# PocketBase admin credentials (server-side only, never exposed to browser)
+POCKETBASE_ADMIN_EMAIL=admin@libnovel.local
+POCKETBASE_ADMIN_PASSWORD=changeme123
+
+# Public-facing MinIO URL (used to rewrite presigned URLs for the browser)
+# In dev this is localhost; in prod set to your MinIO public domain
+PUBLIC_MINIO_PUBLIC_URL=http://localhost:9000
+
+# Secret used to sign auth tokens stored in cookies (generate with: openssl rand -hex 32)
+AUTH_SECRET=change_this_to_a_long_random_secret

v3/ui/.gitignore

@@ -0,0 +1,23 @@
+node_modules
+
+# Output
+.output
+.vercel
+.netlify
+.wrangler
+/.svelte-kit
+/build
+
+# OS
+.DS_Store
+Thumbs.db
+
+# Env
+.env
+.env.*
+!.env.example
+!.env.test
+
+# Vite
+vite.config.js.timestamp-*
+vite.config.ts.timestamp-*

v3/ui/.npmrc

@@ -0,0 +1 @@
+engine-strict=true

v3/ui/AGENTS.md

@@ -0,0 +1,71 @@
+# LibNovel UI — Agent Context
+
+SvelteKit 2 + Svelte 5 frontend. Node adapter for production; served behind Caddy.
+
+## Design System
+
+**ACTIVE_STYLE: branded**
+
+Custom amber + zinc dark palette. No shadcn CLI defaults — primitives are hand-authored to match.
+
+| Token | Value |
+|-------|-------|
+| Accent | `#f59e0b` (amber-400) |
+| Surface-1 | zinc-900 |
+| Surface-2 | zinc-800 |
+| Surface-3 | zinc-700 |
+| Text-primary | zinc-100 |
+| Text-secondary | zinc-400 |
+| Destructive | red-400 |
+
+## Tailwind
+
+**Version: 4** — configured entirely via `@theme {}` in `src/app.css` and the `@tailwindcss/vite` plugin.
+
+**There is no `tailwind.config.ts`** — do not create one.
+**Do not run `npx shadcn-svelte add ...`** — primitives are hand-authored in `$lib/components/ui/`.
+
+## shadcn-svelte Primitives
+
+All in `src/lib/components/ui/`:
+
+| Component | Variants / Notes |
+|-----------|-----------------|
+| `button` | default / secondary / outline / ghost / destructive / link; sizes: default / sm / lg / icon |
+| `badge` | default / secondary / outline / destructive |
+| `card` | Card, CardHeader, CardTitle, CardDescription, CardContent, CardFooter |
+| `textarea` | bindable `value` prop |
+| `dialog` | Dialog, DialogContent, DialogHeader, DialogTitle, DialogFooter |
+| `separator` | horizontal / vertical |
+
+Always use `cn()` from `$lib/utils` — never template-literal class conditionals.
+
+## Svelte 5 Conventions
+
+- `@Observable` / runes (`$state`, `$derived`, `$effect`, `$props()`) for all new code.
+- Do not add `ObservableObject` / `@Published` — they don't exist in Svelte; don't introduce legacy `writable` stores for new code.
+- Navigation: `goto()` from `$app/navigation`; `page` from `$app/state`.
+
+## iOS/UX Skill
+
+For any view work, load the `ios-ux` skill at task start:
+```
+skill({ name: "ios-ux" })
+```
+
+## Key Files
+
+| File | Role |
+|------|------|
+| `src/app.css` | Tailwind v4 `@theme` tokens — source of truth for all design tokens |
+| `src/lib/utils.ts` | `cn()` helper (clsx + tailwind-merge) |
+| `src/lib/types.ts` | Shared client-safe domain types |
+| `src/routes/+layout.svelte` | Root layout: sticky nav, persistent `<audio>` element, mini-player bar |
+| `src/lib/audio.svelte.ts` | Global audio store (Svelte 5 runes class) |
+| `src/lib/components/ui/` | shadcn-style UI primitives |
+
+## Persistent Audio Element
+
+The `<audio>` element in `+layout.svelte` **must never be conditionally rendered** (no `{#if}`).
+Conditional rendering destroys and recreates the element, triggering `onpause` mid-playback.
+Keep it always in the DOM; control it via `audioStore`.

v3/ui/Dockerfile

@@ -0,0 +1,44 @@
+# syntax=docker/dockerfile:1
+FROM node:22-alpine AS builder
+WORKDIR /app
+
+# Install dependencies in a separate layer so it is cached as long as
+# package-lock.json does not change.  The npm cache mount persists the
+# ~/.npm cache across builds so packages are not re-downloaded.
+COPY package.json package-lock.json ./
+RUN --mount=type=cache,target=/root/.npm \
+    npm ci
+
+COPY . .
+
+# Build-time version info — injected by docker-compose or CI via --build-arg.
+ARG BUILD_VERSION=dev
+ARG BUILD_COMMIT=unknown
+
+# Expose as PUBLIC_ env vars so SvelteKit's $env/dynamic/public can read them.
+ENV PUBLIC_BUILD_VERSION=$BUILD_VERSION
+ENV PUBLIC_BUILD_COMMIT=$BUILD_COMMIT
+
+RUN npm run build
+
+# ── Runtime image ──────────────────────────────────────────────────────────────
+# adapter-node bundles most server-side code, but packages with dynamic
+# requires or native bindings (e.g. ioredis) are not inlined by Rollup and
+# must be present in node_modules at runtime.  We install only production
+# deps (no devDependencies) to keep the image small.
+FROM node:22-alpine
+WORKDIR /app
+
+COPY --from=builder /app/build ./build
+COPY --from=builder /app/package.json ./package.json
+COPY --from=builder /app/package-lock.json ./package-lock.json
+
+RUN --mount=type=cache,target=/root/.npm \
+    npm ci --omit=dev
+
+ENV NODE_ENV=production
+ENV PORT=3000
+ENV HOST=0.0.0.0
+
+EXPOSE $PORT
+CMD ["node", "build"]

v3/ui/README.md

@@ -0,0 +1,42 @@
+# sv
+
+Everything you need to build a Svelte project, powered by [`sv`](https://github.com/sveltejs/cli).
+
+## Creating a project
+
+If you're seeing this, you've probably already done this step. Congrats!
+
+```sh
+# create a new project
+npx sv create my-app
+```
+
+To recreate this project with the same configuration:
+
+```sh
+# recreate this project
+npx sv@0.12.4 create --template minimal --types ts --install npm ui
+```
+
+## Developing
+
+Once you've created a project and installed dependencies with `npm install` (or `pnpm install` or `yarn`), start a development server:
+
+```sh
+npm run dev
+
+# or start the server and open the app in a new browser tab
+npm run dev -- --open
+```
+
+## Building
+
+To create a production version of your app:
+
+```sh
+npm run build
+```
+
+You can preview the production build with `npm run preview`.
+
+> To deploy your app, you may need to install an [adapter](https://svelte.dev/docs/kit/adapters) for your target environment.

v3/ui/components.json

@@ -0,0 +1,17 @@
+{
+  "$schema": "https://shadcn-svelte.com/schema.json",
+  "style": "default",
+  "tailwind": {
+    "config": "",
+    "css": "src/app.css",
+    "baseColor": "zinc",
+    "cssVariables": false
+  },
+  "aliases": {
+    "components": "$lib/components",
+    "utils": "$lib/utils",
+    "ui": "$lib/components/ui",
+    "hooks": "$lib/hooks"
+  },
+  "typescript": true
+}

v3/ui/package.json

@@ -0,0 +1,37 @@
+{
+	"name": "ui",
+	"private": true,
+	"version": "0.0.1",
+	"type": "module",
+	"scripts": {
+		"dev": "vite dev",
+		"build": "vite build",
+		"preview": "vite preview",
+		"prepare": "svelte-kit sync || echo ''",
+		"check": "svelte-kit sync && svelte-check --tsconfig ./tsconfig.json",
+		"check:watch": "svelte-kit sync && svelte-check --tsconfig ./tsconfig.json --watch"
+	},
+	"devDependencies": {
+		"@sveltejs/adapter-auto": "^7.0.0",
+		"@sveltejs/adapter-node": "^5.5.4",
+		"@sveltejs/kit": "^2.50.2",
+		"@sveltejs/vite-plugin-svelte": "^6.2.4",
+		"@tailwindcss/vite": "^4.2.1",
+		"@types/node": "^25.3.3",
+		"clsx": "^2.1.1",
+		"svelte": "^5.51.0",
+		"svelte-check": "^4.4.2",
+		"tailwind-merge": "^3.5.0",
+		"tailwindcss": "^4.2.1",
+		"typescript": "^5.9.3",
+		"vite": "^7.3.1"
+	},
+	"dependencies": {
+		"@aws-sdk/client-s3": "^3.1005.0",
+		"@aws-sdk/s3-request-presigner": "^3.1005.0",
+		"cropperjs": "^1.6.2",
+		"ioredis": "^5.3.2",
+		"marked": "^17.0.3",
+		"pocketbase": "^0.26.8"
+	}
+}

v3/ui/src/app.css

@@ -0,0 +1,65 @@
+@import "tailwindcss";
+
+@theme {
+	--color-brand: #f59e0b;       /* amber-400 */
+	--color-brand-dim: #d97706;   /* amber-600 */
+	--color-surface: #18181b;     /* zinc-900 */
+	--color-surface-2: #27272a;   /* zinc-800 */
+	--color-surface-3: #3f3f46;   /* zinc-700 */
+	--color-muted: #a1a1aa;       /* zinc-400 */
+	--color-text: #f4f4f5;        /* zinc-100 */
+}
+
+html {
+	background-color: var(--color-surface);
+	color: var(--color-text);
+}
+
+/* ── Chapter prose ─────────────────────────────────────────────────── */
+.prose-chapter {
+	max-width: 72ch;
+	line-height: 1.85;
+	font-size: 1.05rem;
+	color: #d4d4d8; /* zinc-300 */
+}
+
+.prose-chapter h1,
+.prose-chapter h2,
+.prose-chapter h3 {
+	color: #f4f4f5;
+	font-weight: 700;
+	margin-top: 1.5em;
+	margin-bottom: 0.5em;
+}
+
+.prose-chapter h1 { font-size: 1.4rem; }
+.prose-chapter h2 { font-size: 1.2rem; }
+.prose-chapter h3 { font-size: 1.05rem; }
+
+.prose-chapter p {
+	margin-bottom: 1.2em;
+}
+
+.prose-chapter em {
+	color: #a1a1aa;
+}
+
+.prose-chapter strong {
+	color: #f4f4f5;
+}
+
+.prose-chapter hr {
+	border-color: #3f3f46;
+	margin: 2em 0;
+}
+
+/* ── Navigation progress bar ───────────────────────────────────────── */
+@keyframes progress-bar {
+	0%   { width: 0%; opacity: 1; }
+	80%  { width: 90%; opacity: 1; }
+	100% { width: 100%; opacity: 0; }
+}
+.animate-progress-bar {
+	animation: progress-bar 8s cubic-bezier(0.1, 0.05, 0.1, 1) forwards;
+}
+

v3/ui/src/app.d.ts

@@ -0,0 +1,18 @@
+// See https://svelte.dev/docs/kit/types#app.d.ts
+// for information about these interfaces
+declare global {
+	namespace App {
+		// interface Error {}
+		interface Locals {
+			sessionId: string;
+			user: { id: string; username: string; role: string; authSessionId: string } | null;
+		}
+		interface PageData {
+			user?: { id: string; username: string; role: string; authSessionId: string } | null;
+		}
+		// interface PageState {}
+		// interface Platform {}
+	}
+}
+
+export {};

v3/ui/src/app.html

@@ -0,0 +1,17 @@
+<!doctype html>
+<html lang="en">
+	<head>
+		<meta charset="utf-8" />
+		<meta name="viewport" content="width=device-width, initial-scale=1" />
+		<link rel="icon" href="/favicon.ico" sizes="16x16 32x32" />
+		<link rel="icon" type="image/png" href="/favicon-32.png" sizes="32x32" />
+		<link rel="icon" type="image/png" href="/favicon-16.png" sizes="16x16" />
+		<link rel="apple-touch-icon" href="/apple-touch-icon.png" />
+		<link rel="icon" type="image/png" href="/icon-192.png" sizes="192x192" />
+		<link rel="icon" type="image/png" href="/icon-512.png" sizes="512x512" />
+		%sveltekit.head%
+	</head>
+	<body data-sveltekit-preload-data="hover">
+		<div style="display: contents">%sveltekit.body%</div>
+	</body>
+</html>

v3/ui/src/hooks.server.ts

@@ -0,0 +1,155 @@
+import type { Handle } from '@sveltejs/kit';
+import { randomBytes, createHmac } from 'node:crypto';
+import { env } from '$env/dynamic/private';
+import { log } from '$lib/server/logger';
+import { createUserSession, touchUserSession, isSessionRevoked } from '$lib/server/pocketbase';
+import { drain as drainPresignCache } from '$lib/server/presignCache';
+
+// ─── Graceful shutdown ────────────────────────────────────────────────────────
+//
+// When Docker/Kubernetes sends SIGTERM (or the user sends SIGINT), we:
+//  1. Set shuttingDown = true so new requests immediately receive 503.
+//  2. Flush/drain in-process caches (presign URL cache).
+//  3. Allow Node.js to exit naturally once in-flight requests finish.
+//
+// adapter-node does not provide a built-in hook for this, so we wire it here
+// in hooks.server.ts which runs in the server Node.js process.
+
+let shuttingDown = false;
+
+function shutdown(signal: string) {
+	if (shuttingDown) return;
+	shuttingDown = true;
+	log.info('shutdown', `received ${signal}, draining in-flight requests`);
+	drainPresignCache();
+	// Don't call process.exit() — let Node exit naturally once the event loop
+	// is empty (adapter-node closes the HTTP server on its own).
+}
+
+process.once('SIGTERM', () => shutdown('SIGTERM'));
+process.once('SIGINT', () => shutdown('SIGINT'));
+
+const SESSION_COOKIE = 'libnovel_session';
+const AUTH_COOKIE = 'libnovel_auth';
+const ONE_YEAR = 60 * 60 * 24 * 365;
+
+const AUTH_SECRET = env.AUTH_SECRET ?? 'dev_secret_change_in_production';
+
+// ─── Token helpers ────────────────────────────────────────────────────────────
+
+/**
+ * Sign a payload string with HMAC-SHA256 using AUTH_SECRET.
+ * Returns "<payload>.<signature>".
+ */
+export function signToken(payload: string): string {
+	const sig = createHmac('sha256', AUTH_SECRET).update(payload).digest('hex');
+	return `${payload}.${sig}`;
+}
+
+/**
+ * Verify a signed token. Returns the payload string on success, null on failure.
+ */
+export function verifyToken(token: string): string | null {
+	const lastDot = token.lastIndexOf('.');
+	if (lastDot < 0) return null;
+	const payload = token.slice(0, lastDot);
+	const expected = createHmac('sha256', AUTH_SECRET).update(payload).digest('hex');
+	const actual = token.slice(lastDot + 1);
+	// constant-time comparison
+	if (expected.length !== actual.length) return null;
+	let diff = 0;
+	for (let i = 0; i < expected.length; i++) {
+		diff |= expected.charCodeAt(i) ^ actual.charCodeAt(i);
+	}
+	return diff === 0 ? payload : null;
+}
+
+/**
+ * Create a signed auth token for a user.
+ * Payload format: "<userId>:<username>:<role>:<authSessionId>"
+ * authSessionId uniquely identifies this login session (for revocation).
+ */
+export function createAuthToken(userId: string, username: string, role: string, authSessionId: string): string {
+	return signToken(`${userId}:${username}:${role}:${authSessionId}`);
+}
+
+/**
+ * Parse a verified auth token into user data. Returns null if invalid.
+ * Supports both old format (3 segments) and new format (4 segments).
+ */
+export function parseAuthToken(token: string): { id: string; username: string; role: string; authSessionId: string } | null {
+	const payload = verifyToken(token);
+	if (!payload) return null;
+	const parts = payload.split(':');
+	// New format: userId:username:role:authSessionId (4 parts)
+	// Old format: userId:username:role (3 parts — legacy tokens before session tracking)
+	if (parts.length < 3) return null;
+	const id = parts[0];
+	const username = parts[1];
+	const role = parts[2];
+	const authSessionId = parts[3] ?? ''; // empty string for legacy tokens
+	if (!id || !username) return null;
+	return { id, username, role, authSessionId };
+}
+
+// ─── Hook ─────────────────────────────────────────────────────────────────────
+
+export const handle: Handle = async ({ event, resolve }) => {
+	// During graceful shutdown, reject new requests immediately so the load
+	// balancer / Docker health-check can drain existing connections.
+	if (shuttingDown) {
+		return new Response('Service shutting down', { status: 503 });
+	}
+
+	// Anonymous session cookie (for reading progress)
+	let sessionId = event.cookies.get(SESSION_COOKIE) ?? '';
+	if (!sessionId) {
+		sessionId = randomBytes(16).toString('hex');
+		event.cookies.set(SESSION_COOKIE, sessionId, {
+			path: '/',
+			httpOnly: true,
+			sameSite: 'lax',
+			maxAge: ONE_YEAR
+		});
+	}
+	event.locals.sessionId = sessionId;
+
+	// Auth cookie → resolve logged-in user
+	const authToken = event.cookies.get(AUTH_COOKIE);
+	if (authToken) {
+		const user = parseAuthToken(authToken);
+		if (!user) {
+			log.warn('auth', 'auth cookie present but failed to parse (malformed or tampered)');
+			event.locals.user = null;
+		} else {
+			// Validate session against DB (only for new-format tokens with authSessionId)
+			let sessionValid = true;
+			if (user.authSessionId) {
+				try {
+					const revoked = await isSessionRevoked(user.authSessionId);
+					if (revoked) {
+						log.info('auth', 'auth cookie references revoked session', {
+							userId: user.id,
+							authSessionId: user.authSessionId
+						});
+						sessionValid = false;
+						// Clear the invalid cookie
+						event.cookies.delete(AUTH_COOKIE, { path: '/' });
+					} else {
+						// Best-effort: update last_seen in the background
+						touchUserSession(user.authSessionId).catch(() => {});
+					}
+				} catch (err) {
+					// DB error — fail open to avoid locking everyone out
+					log.warn('auth', 'session check failed (fail open)', { err: String(err) });
+				}
+			}
+			event.locals.user = sessionValid ? user : null;
+		}
+	} else {
+		event.locals.user = null;
+	}
+
+	return resolve(event);
+};
+

v3/ui/src/lib/assets/favicon.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="107" height="128" viewBox="0 0 107 128"><title>svelte-logo</title><path d="M94.157 22.819c-10.4-14.885-30.94-19.297-45.792-9.835L22.282 29.608A29.92 29.92 0 0 0 8.764 49.65a31.5 31.5 0 0 0 3.108 20.231 30 30 0 0 0-4.477 11.183 31.9 31.9 0 0 0 5.448 24.116c10.402 14.887 30.942 19.297 45.791 9.835l26.083-16.624A29.92 29.92 0 0 0 98.235 78.35a31.53 31.53 0 0 0-3.105-20.232 30 30 0 0 0 4.474-11.182 31.88 31.88 0 0 0-5.447-24.116" style="fill:#ff3e00"/><path d="M45.817 106.582a20.72 20.72 0 0 1-22.237-8.243 19.17 19.17 0 0 1-3.277-14.503 18 18 0 0 1 .624-2.435l.49-1.498 1.337.981a33.6 33.6 0 0 0 10.203 5.098l.97.294-.09.968a5.85 5.85 0 0 0 1.052 3.878 6.24 6.24 0 0 0 6.695 2.485 5.8 5.8 0 0 0 1.603-.704L69.27 76.28a5.43 5.43 0 0 0 2.45-3.631 5.8 5.8 0 0 0-.987-4.371 6.24 6.24 0 0 0-6.698-2.487 5.7 5.7 0 0 0-1.6.704l-9.953 6.345a19 19 0 0 1-5.296 2.326 20.72 20.72 0 0 1-22.237-8.243 19.17 19.17 0 0 1-3.277-14.502 17.99 17.99 0 0 1 8.13-12.052l26.081-16.623a19 19 0 0 1 5.3-2.329 20.72 20.72 0 0 1 22.237 8.243 19.17 19.17 0 0 1 3.277 14.503 18 18 0 0 1-.624 2.435l-.49 1.498-1.337-.98a33.6 33.6 0 0 0-10.203-5.1l-.97-.294.09-.968a5.86 5.86 0 0 0-1.052-3.878 6.24 6.24 0 0 0-6.696-2.485 5.8 5.8 0 0 0-1.602.704L37.73 51.72a5.42 5.42 0 0 0-2.449 3.63 5.79 5.79 0 0 0 .986 4.372 6.24 6.24 0 0 0 6.698 2.486 5.8 5.8 0 0 0 1.602-.704l9.952-6.342a19 19 0 0 1 5.295-2.328 20.72 20.72 0 0 1 22.237 8.242 19.17 19.17 0 0 1 3.277 14.503 18 18 0 0 1-8.13 12.053l-26.081 16.622a19 19 0 0 1-5.3 2.328" style="fill:#fff"/></svg>

v3/ui/src/lib/audio.svelte.ts

@@ -0,0 +1,146 @@
+/**
+ * Global audio player state for libnovel.
+ *
+ * A single shared instance (module singleton) keeps audio playing across
+ * SvelteKit navigations.  The layout mounts the <audio> element once and
+ * never unmounts it; the per-chapter AudioPlayer component is just a
+ * controller that reads/writes this state.
+ *
+ * Uses Svelte 5 runes ($state / $derived) — import only from .svelte files
+ * or other .svelte.ts files.
+ *
+ * ── State machine ────────────────────────────────────────────────────────────
+ *
+ * Current chapter (status):
+ *   idle  →  loading  →  ready  (fast path: audio exists in MinIO)
+ *   idle  →  loading  →  generating  →  ready  (slow path: Kokoro TTS)
+ *   any  →  error
+ *
+ * Next chapter pre-fetch (nextStatus):
+ *   'none'        – no next chapter, or auto-next is off
+ *   'prefetching' – POST /api/audio running for the next chapter
+ *   'prefetched'  – next chapter audio is ready in MinIO
+ *   'failed'      – pre-generation failed (will retry on navigate)
+ *
+ * Auto-next transition:
+ *   onended fires  →  navigate to next chapter URL
+ *     ↳ new chapter page mounts
+ *       • if nextStatus === 'prefetched'  → presign + play immediately
+ *       • else                            → normal startPlayback() flow
+ *
+ * Pre-fetch is triggered when currentTime / duration >= 0.9 (90% mark).
+ * It only runs once per chapter (guarded by nextStatus !== 'none').
+ */
+
+export type AudioStatus = 'idle' | 'loading' | 'generating' | 'ready' | 'error';
+export type NextStatus = 'none' | 'prefetching' | 'prefetched' | 'failed';
+
+class AudioStore {
+	// ── What is loaded ──────────────────────────────────────────────────────
+	slug = $state('');
+	chapter = $state(0);
+	chapterTitle = $state('');
+	bookTitle = $state('');
+	voice = $state('af_bella');
+	speed = $state(1.0);
+
+	/** Cover image URL for the currently loaded book. */
+	cover = $state('');
+
+	/** Full chapter list for the currently loaded book (number + title). */
+	chapters = $state<{ number: number; title: string }[]>([]);
+
+	// ── Loading/generation state ────────────────────────────────────────────
+	status = $state<AudioStatus>('idle');
+	audioUrl = $state('');
+	errorMsg = $state('');
+	/** Pseudo-progress bar value 0–100 during generation */
+	progress = $state(0);
+
+	// ── Playback state (kept in sync with the <audio> element) ─────────────
+	currentTime = $state(0);
+	duration = $state(0);
+	isPlaying = $state(false);
+
+	/**
+	 * Increment to signal the layout to toggle play/pause.
+	 * The layout watches this with $effect and calls audioEl.play()/pause().
+	 */
+	toggleRequest = $state(0);
+
+	/**
+	 * Set to a number to seek the audio element to that time (seconds).
+	 * The layout watches this with $effect and sets audioEl.currentTime.
+	 * Reset to null after handling.
+	 */
+	seekRequest = $state<number | null>(null);
+
+	// ── Auto-next ────────────────────────────────────────────────────────────
+	/**
+	 * When true, navigates to the next chapter when the current one ends
+	 * and auto-starts its audio.
+	 */
+	autoNext = $state(false);
+
+	/**
+	 * The next chapter number for the currently playing chapter, or null if
+	 * there is no next chapter.  Written by the chapter page's AudioPlayer.
+	 * Stored here (not cleared on unmount) so onended can still read it after
+	 * the component unmounts due to {#key} re-render on navigation.
+	 */
+	nextChapter = $state<number | null>(null);
+
+	/**
+	 * Set to the chapter number that should auto-start by the layout's onended
+	 * handler (when autoNext fires a navigation).  The AudioPlayer on the new
+	 * page checks this on mount: if it matches the component's own chapter prop
+	 * it starts playback and clears the value.
+	 *
+	 * Using the target chapter number (instead of a plain boolean) prevents the
+	 * still-mounted outgoing AudioPlayer from reacting to the flag before the
+	 * navigation completes — it only matches the incoming chapter's component.
+	 */
+	autoStartChapter = $state<number | null>(null);
+
+	// ── Next-chapter pre-fetch state ─────────────────────────────────────────
+	/**
+	 * State of the background pre-generation for the next chapter.
+	 * 'none'        – nothing started (default / no next chapter)
+	 * 'prefetching' – currently running POST /api/audio for next chapter
+	 * 'prefetched'  – next chapter audio confirmed ready in MinIO
+	 * 'failed'      – pre-generation failed (fallback: generate on navigate)
+	 */
+	nextStatus = $state<NextStatus>('none');
+
+	/**
+	 * The presigned URL obtained during pre-fetch.  When the user navigates
+	 * to the next chapter, AudioPlayer picks this up and skips straight to play.
+	 */
+	nextAudioUrl = $state('');
+
+	/** Progress value (0–100) shown while pre-generating the next chapter. */
+	nextProgress = $state(0);
+
+	/** Which chapter number the pre-fetch state above belongs to. */
+	nextChapterPrefetched = $state<number | null>(null);
+
+	/** Whether the mini-bar at the bottom is visible */
+	get active(): boolean {
+		return this.status === 'ready' || this.status === 'generating' || this.status === 'loading';
+	}
+
+	/** True when the currently loaded track matches slug+chapter */
+	isCurrentChapter(slug: string, chapter: number): boolean {
+		return this.slug === slug && this.chapter === chapter;
+	}
+
+	/** Reset all next-chapter pre-fetch state. */
+	resetNextPrefetch() {
+		this.nextStatus = 'none';
+		this.nextAudioUrl = '';
+		this.nextProgress = 0;
+		this.nextChapterPrefetched = null;
+	}
+}
+
+export const audioStore = new AudioStore();

v3/ui/src/lib/components/AudioPlayer.svelte

@@ -0,0 +1,851 @@
+<script lang="ts">
+	/**
+	 * AudioPlayer — controller component.
+	 *
+	 * Does NOT own an <audio> element.  Instead it reads/writes `audioStore`,
+	 * which is shared with the layout's persistent <audio> element so audio
+	 * survives SvelteKit navigations.
+	 *
+	 * ── Play flow ────────────────────────────────────────────────────────────
+	 * On "Play narration" click / auto-start:
+	 *   1. Populate store metadata (slug, chapter, titles, voice, speed).
+	 *   2. If the pre-fetch already landed (nextStatus='prefetched' AND
+	 *      nextChapterPrefetched === chapter), use the cached URL immediately.
+	 *   3. Otherwise try GET /api/presign/audio — if 200, set audioUrl → layout plays.
+	 *   4. If 404, POST /api/audio/:slug/:n to generate. Drive pseudo progress bar.
+	 *      On success (200 or 202→done), presign and set audioUrl directly from MinIO.
+	 *
+	 * ── Voice selection ──────────────────────────────────────────────────────
+	 * A "Change voice" panel lets users pick from the available Kokoro voices.
+	 * Each voice shows a play button that streams a pre-generated sample from
+	 * MinIO (GET /api/presign/voice-sample?voice=...). Samples are generated
+	 * server-side via POST /api/audio/voice-samples.
+	 *
+	 * Changing voice updates audioStore.voice (saved to settings via layout).
+	 * The currently loaded chapter audio is NOT re-generated automatically —
+	 * the new voice takes effect on next "Play narration" click.
+	 *
+	 * ── Pre-fetch (immediate + 90% fallback) ────────────────────────────────
+	 * When autoNext is on, prefetchNext() is called as soon as the current
+	 * chapter starts playing (via maybeStartPrefetch() at the end of
+	 * startPlayback()).  This gives the maximum lead time for Kokoro to
+	 * generate the next chapter so the transition is seamless.
+	 *
+	 * A $effect also watches currentTime/duration and fires prefetchNext() at
+	 * the 90% mark as a fallback — covering the case where autoNext was toggled
+	 * on mid-playback after startPlayback() had already returned.
+	 * The nextStatus !== 'none' guard prevents double-runs in all cases.
+	 *
+	 * prefetchNext():
+	 *   • Calls POST /api/audio for next chapter (sets nextStatus='prefetching')
+	 *   • On success, presigns and stores URL in audioStore.nextAudioUrl
+	 *     (sets nextStatus='prefetched')
+	 *   • On failure, sets nextStatus='failed'
+	 *
+	 * ── Auto-next ────────────────────────────────────────────────────────────
+	 * layout.svelte onended → sets autoStartPending=true → navigates.
+	 * New chapter's AudioPlayer mounts → sees autoStartPending → startPlayback()
+	 * which uses the prefetched URL if available.
+	 */
+
+	import { audioStore } from '$lib/audio.svelte';
+	import { Button } from '$lib/components/ui/button';
+	import { cn } from '$lib/utils';
+
+	interface Props {
+		slug: string;
+		chapter: number;
+		chapterTitle?: string;
+		bookTitle?: string;
+		/** Cover image URL for the book (used in MediaSession for lock-screen art). */
+		cover?: string;
+		/** Next chapter number, or null/undefined if this is the last chapter. */
+		nextChapter?: number | null;
+		/** Full chapter list for the book (number + title). Written into the store. */
+		chapters?: { number: number; title: string }[];
+		/** List of available voices from the Kokoro API. */
+		voices?: string[];
+	}
+
+	let {
+		slug,
+		chapter,
+		chapterTitle = '',
+		bookTitle = '',
+		cover = '',
+		nextChapter = null,
+		chapters = [],
+		voices = []
+	}: Props = $props();
+
+	// ── Voice selector state ────────────────────────────────────────────────
+	let showVoicePanel = $state(false);
+	/** Voice whose sample is currently being fetched or playing. */
+	let samplePlayingVoice = $state<string | null>(null);
+	/** Currently active sample <audio> element — one at a time. */
+	let sampleAudio = $state<HTMLAudioElement | null>(null);
+
+	/**
+	 * Human-readable label for a voice ID.
+	 * e.g. "af_bella" → "Bella (US F)" | "bm_george" → "George (UK M)"
+	 */
+	function voiceLabel(v: string): string {
+		const langMap: Record<string, string> = {
+			af: 'US', am: 'US',
+			bf: 'UK', bm: 'UK',
+			ef: 'ES', em: 'ES',
+			ff: 'FR',
+			hf: 'IN', hm: 'IN',
+			'if': 'IT', im: 'IT',
+			jf: 'JP', jm: 'JP',
+			pf: 'PT', pm: 'PT',
+			zf: 'ZH', zm: 'ZH',
+		};
+		const genderMap: Record<string, string> = {
+			af: 'F', am: 'M',
+			bf: 'F', bm: 'M',
+			ef: 'F', em: 'M',
+			ff: 'F',
+			hf: 'F', hm: 'M',
+			'if': 'F', im: 'M',
+			jf: 'F', jm: 'M',
+			pf: 'F', pm: 'M',
+			zf: 'F', zm: 'M',
+		};
+		const prefix = v.slice(0, 2);
+		const name = v.slice(3);
+		// Capitalise and strip legacy v0 prefix.
+		const displayName = name
+			.replace(/^v0/, '')
+			.replace(/^([a-z])/, (c: string) => c.toUpperCase());
+		const lang = langMap[prefix] ?? prefix.toUpperCase();
+		const gender = genderMap[prefix] ?? '?';
+		return `${displayName} (${lang} ${gender})`;
+	}
+
+	/** Stop any currently playing sample. */
+	function stopSample() {
+		if (sampleAudio) {
+			sampleAudio.pause();
+			sampleAudio.src = '';
+			sampleAudio = null;
+		}
+		samplePlayingVoice = null;
+	}
+
+	/** Play a voice sample from MinIO. */
+	async function playSample(voice: string) {
+		// If this voice is already playing, stop it.
+		if (samplePlayingVoice === voice) {
+			stopSample();
+			return;
+		}
+		stopSample();
+
+		samplePlayingVoice = voice;
+		try {
+			const res = await fetch(`/api/presign/voice-sample?voice=${encodeURIComponent(voice)}`);
+			if (res.status === 404) {
+				// Sample not generated yet — silently ignore
+				samplePlayingVoice = null;
+				return;
+			}
+			if (!res.ok) throw new Error(`presign failed: ${res.status}`);
+			const data = (await res.json()) as { url: string };
+
+			const audio = new Audio(data.url);
+			sampleAudio = audio;
+			audio.onended = () => {
+				if (samplePlayingVoice === voice) stopSample();
+			};
+			audio.onerror = () => {
+				if (samplePlayingVoice === voice) stopSample();
+			};
+			await audio.play();
+		} catch {
+			samplePlayingVoice = null;
+		}
+	}
+
+	/** Select a voice and close the panel. */
+	function selectVoice(voice: string) {
+		stopSample();
+		audioStore.voice = voice;
+		showVoicePanel = false;
+	}
+
+	// Keep nextChapter in the store so the layout's onended can navigate.
+	// NOTE: we do NOT clear on unmount here — the store retains the value so
+	// onended (which may fire after {#key} unmounts this component) can still
+	// read it.  The value is superseded when the new chapter mounts.
+	$effect(() => {
+		audioStore.nextChapter = nextChapter ?? null;
+	});
+
+	// Auto-start: if the layout navigated here via auto-next, kick off playback.
+	// We match against the chapter prop so the outgoing chapter's AudioPlayer
+	// (still mounted during the brief navigation window) never reacts to this.
+	$effect(() => {
+		if (audioStore.autoStartChapter === chapter) {
+			audioStore.autoStartChapter = null;
+			startPlayback();
+		}
+	});
+
+	// Reset next-chapter prefetch state when this chapter changes (new page).
+	// Only reset if the prefetch belongs to neither the current chapter
+	// (about to be consumed by startPlayback) nor the next chapter (still valid).
+	// Any other value means stale data from a previous page.
+	$effect(() => {
+		const prefetchedFor = audioStore.nextChapterPrefetched;
+		if (
+			prefetchedFor !== null &&
+			prefetchedFor !== chapter &&
+			prefetchedFor !== (nextChapter ?? null)
+		) {
+			audioStore.resetNextPrefetch();
+		}
+	});
+
+	// Close voice panel when user clicks outside (escape key).
+	function handleKeyDown(e: KeyboardEvent) {
+		if (e.key === 'Escape') {
+			stopSample();
+			showVoicePanel = false;
+		}
+	}
+
+	// ── 90% pre-fetch trigger ─────────────────────────────────────────────────
+	// Watch playback progress; when >= 90% of current chapter, pre-generate
+	// the next chapter's audio so it's ready when we navigate.
+	$effect(() => {
+		const ct = audioStore.currentTime;
+		const dur = audioStore.duration;
+		const isCurrentlyPlaying = audioStore.isCurrentChapter(slug, chapter);
+
+		if (
+			!isCurrentlyPlaying ||
+			!audioStore.autoNext ||
+			nextChapter === null ||
+			nextChapter === undefined ||
+			dur <= 0 ||
+			ct / dur < 0.9 ||
+			audioStore.nextStatus !== 'none'
+		) {
+			return;
+		}
+
+		// Trigger exactly once (nextStatus transitions away from 'none')
+		prefetchNext();
+	});
+
+	// ── Pseudo progress helpers ────────────────────────────────────────────────
+	let progressRafId = 0;
+
+	function startProgress() {
+		audioStore.progress = 0;
+		let last = performance.now();
+
+		function tick(now: number) {
+			const dt = (now - last) / 1000;
+			last = now;
+			let rate: number;
+			if (audioStore.progress < 30) rate = 4;
+			else if (audioStore.progress < 60) rate = 12;
+			else if (audioStore.progress < 80) rate = 4;
+			else rate = 0.3;
+
+			audioStore.progress = Math.min(audioStore.progress + rate * dt, 99);
+			if (audioStore.progress < 99) {
+				progressRafId = requestAnimationFrame(tick);
+			}
+		}
+		progressRafId = requestAnimationFrame(tick);
+	}
+
+	function stopProgress() {
+		if (progressRafId) {
+			cancelAnimationFrame(progressRafId);
+			progressRafId = 0;
+		}
+	}
+
+	async function finishProgress() {
+		stopProgress();
+		const step = () => {
+			audioStore.progress = Math.min(audioStore.progress + 8, 100);
+			if (audioStore.progress < 100) {
+				progressRafId = requestAnimationFrame(step);
+			}
+		};
+		progressRafId = requestAnimationFrame(step);
+		await new Promise((r) => setTimeout(r, 200));
+		stopProgress();
+	}
+
+	// ── Next-chapter pseudo-progress helpers ──────────────────────────────────
+	let nextProgressRafId = 0;
+
+	function startNextProgress() {
+		audioStore.nextProgress = 0;
+		let last = performance.now();
+
+		function tick(now: number) {
+			const dt = (now - last) / 1000;
+			last = now;
+			let rate: number;
+			if (audioStore.nextProgress < 30) rate = 4;
+			else if (audioStore.nextProgress < 60) rate = 12;
+			else if (audioStore.nextProgress < 80) rate = 4;
+			else rate = 0.3;
+
+			audioStore.nextProgress = Math.min(audioStore.nextProgress + rate * dt, 99);
+			if (audioStore.nextProgress < 99) {
+				nextProgressRafId = requestAnimationFrame(tick);
+			}
+		}
+		nextProgressRafId = requestAnimationFrame(tick);
+	}
+
+	function stopNextProgress() {
+		if (nextProgressRafId) {
+			cancelAnimationFrame(nextProgressRafId);
+			nextProgressRafId = 0;
+		}
+	}
+
+	// ── API helpers ────────────────────────────────────────────────────────────
+
+	async function tryPresign(
+		targetSlug: string,
+		targetChapter: number,
+		targetVoice: string
+	): Promise<string | null> {
+		const params = new URLSearchParams({
+			slug: targetSlug,
+			n: String(targetChapter),
+			voice: targetVoice
+		});
+		const res = await fetch(`/api/presign/audio?${params}`);
+		if (res.status === 404) return null;
+		if (!res.ok) throw new Error(`presign HTTP ${res.status}`);
+		const data = (await res.json()) as { url: string };
+		return data.url;
+	}
+
+	type AudioStatusResponse =
+		| { status: 'done' }
+		| { status: 'pending' | 'generating'; job_id: string }
+		| { status: 'idle' }
+		| { status: 'failed'; error?: string };
+
+	/**
+	 * Poll GET /api/audio/status/[slug]/[n]?voice=... every `intervalMs` ms
+	 * until status is "done" or "failed" (or the caller cancels via signal).
+	 *
+	 * Returns the final status response, or throws on network error / cancellation.
+	 */
+	async function pollAudioStatus(
+		targetSlug: string,
+		targetChapter: number,
+		targetVoice: string,
+		intervalMs = 2000,
+		signal?: AbortSignal
+	): Promise<AudioStatusResponse> {
+		const qs = new URLSearchParams();
+		if (targetVoice) qs.set('voice', targetVoice);
+		const url = `/api/audio/status/${targetSlug}/${targetChapter}?${qs.toString()}`;
+
+		while (true) {
+			if (signal?.aborted) throw new DOMException('Aborted', 'AbortError');
+
+			const res = await fetch(url, { signal });
+			if (!res.ok) throw new Error(`Status poll HTTP ${res.status}`);
+			const data = (await res.json()) as AudioStatusResponse;
+
+			if (data.status === 'done' || data.status === 'failed') {
+				return data;
+			}
+
+			// Still pending/generating — wait then retry.
+			await new Promise<void>((resolve, reject) => {
+				const timer = setTimeout(resolve, intervalMs);
+				signal?.addEventListener('abort', () => {
+					clearTimeout(timer);
+					reject(new DOMException('Aborted', 'AbortError'));
+				});
+			});
+		}
+	}
+
+	// ── Pre-fetch next chapter ─────────────────────────────────────────────────
+
+	async function prefetchNext() {
+		if (nextChapter === null || nextChapter === undefined) return;
+		if (audioStore.nextStatus !== 'none') return; // already running or done
+
+		const voice = audioStore.voice;
+
+		audioStore.nextStatus = 'prefetching';
+		audioStore.nextChapterPrefetched = nextChapter;
+		startNextProgress();
+
+		try {
+			// Fast path: already generated
+			const url = await tryPresign(slug, nextChapter, voice);
+			if (url) {
+				stopNextProgress();
+				audioStore.nextProgress = 100;
+				audioStore.nextAudioUrl = url;
+				audioStore.nextStatus = 'prefetched';
+				return;
+			}
+
+			// Slow path: trigger Kokoro generation (non-blocking POST), then poll.
+			const res = await fetch(`/api/audio/${slug}/${nextChapter}`, {
+				method: 'POST',
+				headers: { 'Content-Type': 'application/json' },
+				body: JSON.stringify({ voice })
+			});
+			if (!res.ok) throw new Error(`Prefetch generation failed: HTTP ${res.status}`);
+
+			// Whether the server returned 200 (already cached) or 202 (enqueued),
+			// always presign — the status endpoint no longer returns a proxy URL.
+			if (res.status === 200) {
+				// Body is { status: 'done' } — audio confirmed in MinIO. Presign it.
+				await res.body?.cancel();
+			}
+			// else 202: generation enqueued — fall through to poll.
+
+			if (res.status !== 200) {
+				// 202: poll until done.
+				const final = await pollAudioStatus(slug, nextChapter, voice);
+				stopNextProgress();
+				audioStore.nextProgress = 100;
+
+				if (final.status === 'failed') {
+					throw new Error(`Prefetch failed: ${(final as { error?: string }).error ?? 'unknown'}`);
+				}
+			} else {
+				stopNextProgress();
+				audioStore.nextProgress = 100;
+			}
+
+			// Audio is ready in MinIO — get a direct presigned URL.
+			const doneUrl = await tryPresign(slug, nextChapter, voice);
+			if (!doneUrl) throw new Error('Prefetch: audio done but presign returned 404');
+
+			audioStore.nextAudioUrl = doneUrl;
+			audioStore.nextStatus = 'prefetched';
+		} catch {
+			stopNextProgress();
+			audioStore.nextStatus = 'failed';
+		}
+	}
+
+	// ── Media Session ──────────────────────────────────────────────────────────
+	// Sets the OS-level media metadata so the book cover, title, and chapter
+	// appear on the phone lock screen / notification center.
+
+	function setMediaSession() {
+		if (typeof navigator === 'undefined' || !('mediaSession' in navigator)) return;
+
+		const artwork: MediaImage[] = cover
+			? [
+					{ src: cover, sizes: '512x512', type: 'image/jpeg' },
+					{ src: cover, sizes: '256x256', type: 'image/jpeg' }
+			  ]
+			: [];
+
+		navigator.mediaSession.metadata = new MediaMetadata({
+			title: chapterTitle || `Chapter ${chapter}`,
+			artist: bookTitle,
+			album: bookTitle,
+			artwork
+		});
+	}
+
+	// ── Core play flow ─────────────────────────────────────────────────────────
+
+	async function startPlayback() {
+		const voice = audioStore.voice;
+
+		// Populate store metadata so layout + mini-bar have track info.
+		audioStore.slug = slug;
+		audioStore.chapter = chapter;
+		audioStore.chapterTitle = chapterTitle;
+		audioStore.bookTitle = bookTitle;
+		audioStore.cover = cover;
+		audioStore.chapters = chapters;
+
+		// Update OS media session (lock screen / notification center).
+		setMediaSession();
+
+		audioStore.status = 'loading';
+		audioStore.errorMsg = '';
+
+		try {
+			// Fast path A: pre-fetch already landed for THIS chapter.
+			if (
+				audioStore.nextStatus === 'prefetched' &&
+				audioStore.nextChapterPrefetched === chapter &&
+				audioStore.nextAudioUrl
+			) {
+				const url = audioStore.nextAudioUrl;
+				// Consume the pre-fetch — reset so it doesn't carry over
+				audioStore.resetNextPrefetch();
+				audioStore.audioUrl = url;
+				audioStore.status = 'ready';
+				// Don't restore saved time for auto-next; position is 0
+				// Immediately start pre-generating the chapter after this one.
+				maybeStartPrefetch();
+				return;
+			}
+
+			// Fast path B: audio already in MinIO (presign check).
+			const url = await tryPresign(slug, chapter, voice);
+			if (url) {
+				audioStore.audioUrl = url;
+				audioStore.status = 'ready';
+				// Restore last saved position after the audio element loads
+				restoreSavedAudioTime();
+				// Immediately start pre-generating the next chapter in background.
+				maybeStartPrefetch();
+				return;
+			}
+
+			// Slow path: trigger Kokoro generation (non-blocking POST), then poll.
+			audioStore.status = 'generating';
+			startProgress();
+
+			const res = await fetch(`/api/audio/${slug}/${chapter}`, {
+				method: 'POST',
+				headers: { 'Content-Type': 'application/json' },
+				body: JSON.stringify({ voice })
+			});
+			if (!res.ok) throw new Error(`Generation failed: HTTP ${res.status}`);
+
+			if (res.status !== 200) {
+				// 202: generation enqueued — poll until done.
+				const final = await pollAudioStatus(slug, chapter, voice);
+
+				if (final.status === 'failed') {
+					throw new Error(
+						`Generation failed: ${(final as { error?: string }).error ?? 'unknown error'}`
+					);
+				}
+			} else {
+				// 200: already cached — body is { status: 'done' }, no url needed.
+				await res.body?.cancel();
+			}
+
+			await finishProgress();
+
+			// Audio is ready in MinIO — always use a presigned URL for direct playback.
+			const doneUrl = await tryPresign(slug, chapter, voice);
+			if (!doneUrl) throw new Error('Audio generated but presign returned 404');
+			audioStore.audioUrl = doneUrl;
+			audioStore.status = 'ready';
+			// Don't restore time for freshly generated audio — position is 0
+			// Immediately start pre-generating the next chapter in background.
+			maybeStartPrefetch();
+		} catch (e) {
+			stopProgress();
+			audioStore.progress = 0;
+			audioStore.status = 'error';
+			audioStore.errorMsg = String(e);
+		}
+	}
+
+	/**
+	 * Start pre-fetching the next chapter if autoNext is on, there is a next
+	 * chapter, and no prefetch is already running or completed.
+	 * Called as soon as current-chapter playback begins so that the next
+	 * chapter's audio is ready before we need it (seamless transition).
+	 * The 90%-mark $effect acts as a fallback for cases where autoNext is
+	 * toggled on mid-playback.
+	 */
+	function maybeStartPrefetch() {
+		if (
+			audioStore.autoNext &&
+			nextChapter !== null &&
+			nextChapter !== undefined &&
+			audioStore.nextStatus === 'none'
+		) {
+			prefetchNext();
+		}
+	}
+
+	/**
+	 * Fetch the saved audio time for this chapter and seek to it after a short
+	 * delay (to allow the audio element to load the source).
+	 */
+	async function restoreSavedAudioTime() {
+		try {
+			const params = new URLSearchParams({ slug, chapter: String(chapter) });
+			const res = await fetch(`/api/progress/audio-time?${params}`);
+			if (!res.ok) return;
+			const data = (await res.json()) as { audioTime: number | null };
+			if (data.audioTime && data.audioTime > 5) {
+				// Small delay to let the <audio> element fully load the src before seeking
+				setTimeout(() => {
+					audioStore.seekRequest = data.audioTime as number;
+				}, 300);
+			}
+		} catch {
+			// Non-critical — silently ignore
+		}
+	}
+
+	async function handlePlay() {
+		const isCurrent = audioStore.isCurrentChapter(slug, chapter);
+
+		// Already loaded this chapter: toggle play/pause.
+		if (isCurrent && audioStore.status === 'ready') {
+			audioStore.toggleRequest = (audioStore.toggleRequest ?? 0) + 1;
+			return;
+		}
+
+		// Not yet loaded — start the full flow.
+		await startPlayback();
+	}
+
+	function formatTime(s: number): string {
+		if (!isFinite(s) || s < 0) return '0:00';
+		const m = Math.floor(s / 60);
+		const sec = Math.floor(s % 60);
+		return `${m}:${sec.toString().padStart(2, '0')}`;
+	}
+</script>
+
+<svelte:window onkeydown={handleKeyDown} />
+
+<div class="mt-6 p-4 rounded-lg bg-zinc-800 border border-zinc-700">
+	<div class="flex items-center justify-between gap-2 mb-3">
+		<div class="flex items-center gap-2">
+			<svg class="w-4 h-4 text-amber-400" fill="currentColor" viewBox="0 0 24 24">
+				<path d="M12 3v10.55A4 4 0 1014 17V7h4V3h-6z"/>
+			</svg>
+			<span class="text-sm text-zinc-300 font-medium">Audio Narration</span>
+		</div>
+
+		<!-- Voice selector button -->
+		{#if voices.length > 0}
+			<Button
+				variant="ghost"
+				size="sm"
+				onclick={() => { stopSample(); showVoicePanel = !showVoicePanel; }}
+				class={cn('gap-1.5 text-xs', showVoicePanel ? 'text-amber-400 bg-amber-400/15 hover:bg-amber-400/25' : '')}
+				title="Change voice"
+			>
+				<svg class="w-3.5 h-3.5" fill="currentColor" viewBox="0 0 24 24">
+					<path d="M12 14c1.66 0 3-1.34 3-3V5c0-1.66-1.34-3-3-3S9 3.34 9 5v6c0 1.66 1.34 3 3 3zm-1-9c0-.55.45-1 1-1s1 .45 1 1v6c0 .55-.45 1-1 1s-1-.45-1-1V5zm6 6c0 2.76-2.24 5-5 5s-5-2.24-5-5H5c0 3.53 2.61 6.43 6 6.92V21h2v-3.08c3.39-.49 6-3.39 6-6.92h-2z"/>
+				</svg>
+				<span class="max-w-[80px] truncate">{voiceLabel(audioStore.voice)}</span>
+				<svg class={cn('w-3 h-3 flex-shrink-0 transition-transform', showVoicePanel && 'rotate-180')} fill="currentColor" viewBox="0 0 24 24">
+					<path d="M7 10l5 5 5-5z"/>
+				</svg>
+			</Button>
+		{/if}
+	</div>
+
+	<!-- ── Voice selector panel ──────────────────────────────────────────── -->
+	{#if showVoicePanel && voices.length > 0}
+		<div class="mb-3 rounded-lg border border-zinc-600 bg-zinc-900 overflow-hidden">
+			<div class="px-3 py-2 border-b border-zinc-700 flex items-center justify-between">
+				<span class="text-xs font-semibold text-zinc-400 uppercase tracking-wider">Choose Voice</span>
+				<Button
+					variant="ghost"
+					size="icon"
+					class="h-6 w-6 text-zinc-500 hover:text-zinc-300"
+					onclick={() => { stopSample(); showVoicePanel = false; }}
+					aria-label="Close voice selector"
+				>
+					<svg class="w-3.5 h-3.5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+						<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M6 18L18 6M6 6l12 12"/>
+					</svg>
+				</Button>
+			</div>
+			<div class="max-h-64 overflow-y-auto">
+				{#each voices as v (v)}
+					<div
+						class={cn('flex items-center gap-2 px-3 py-2 hover:bg-zinc-800 transition-colors cursor-pointer', audioStore.voice === v && 'bg-amber-400/10')}
+						role="button"
+						tabindex="0"
+						onclick={() => selectVoice(v)}
+						onkeydown={(e) => e.key === 'Enter' && selectVoice(v)}
+					>
+						<!-- Selected indicator -->
+						<div class="w-4 flex-shrink-0">
+							{#if audioStore.voice === v}
+								<svg class="w-3.5 h-3.5 text-amber-400" fill="currentColor" viewBox="0 0 24 24">
+									<path d="M9 16.17L4.83 12l-1.42 1.41L9 19 21 7l-1.41-1.41L9 16.17z"/>
+								</svg>
+							{/if}
+						</div>
+
+						<!-- Voice name -->
+						<span class={cn('flex-1 text-xs', audioStore.voice === v ? 'text-amber-400 font-medium' : 'text-zinc-300')}>
+							{voiceLabel(v)}
+						</span>
+						<span class="text-zinc-600 text-xs font-mono">{v}</span>
+
+						<!-- Sample play button (stop propagation so click doesn't select) -->
+						<Button
+							variant="ghost"
+							size="icon"
+							class={cn('h-6 w-6 flex-shrink-0', samplePlayingVoice === v ? 'text-amber-400 bg-amber-400/15 hover:bg-amber-400/25' : 'text-zinc-500 hover:text-zinc-200')}
+							onclick={(e) => { e.stopPropagation(); playSample(v); }}
+							title={samplePlayingVoice === v ? 'Stop sample' : 'Play sample'}
+							aria-label={samplePlayingVoice === v ? `Stop ${v} sample` : `Play ${v} sample`}
+						>
+							{#if samplePlayingVoice === v}
+								<svg class="w-3.5 h-3.5" fill="currentColor" viewBox="0 0 24 24">
+									<path d="M6 6h12v12H6z"/>
+								</svg>
+							{:else}
+								<svg class="w-3.5 h-3.5" fill="currentColor" viewBox="0 0 24 24">
+									<path d="M8 5v14l11-7z"/>
+								</svg>
+							{/if}
+						</Button>
+					</div>
+				{/each}
+			</div>
+			<div class="px-3 py-2 border-t border-zinc-700 bg-zinc-800/50">
+				<p class="text-xs text-zinc-500">
+					New voice applies on next "Play narration".
+					{#if voices.length > 0}
+						<a
+							href="/api/audio/voice-samples"
+							class="text-zinc-400 hover:text-amber-400 transition-colors underline"
+							onclick={(e) => {
+								e.preventDefault();
+								fetch('/api/audio/voice-samples', { method: 'POST' }).catch(() => {});
+							}}
+						>Generate missing samples</a>
+					{/if}
+				</p>
+			</div>
+		</div>
+	{/if}
+
+	{#if audioStore.isCurrentChapter(slug, chapter)}
+		<!-- ── This chapter is the active one ── -->
+
+		{#if audioStore.status === 'idle' || audioStore.status === 'error'}
+			{#if audioStore.status === 'error'}
+				<p class="text-red-400 text-sm mb-2">{audioStore.errorMsg || 'Failed to load audio.'}</p>
+			{/if}
+			<Button variant="default" size="sm" onclick={handlePlay}>
+				<svg class="w-3.5 h-3.5" fill="currentColor" viewBox="0 0 24 24">
+					<path d="M8 5v14l11-7z"/>
+				</svg>
+				Play narration
+			</Button>
+
+		{:else if audioStore.status === 'loading'}
+			<Button variant="default" size="sm" disabled>
+				<svg class="w-3.5 h-3.5 animate-spin" fill="none" viewBox="0 0 24 24">
+					<circle class="opacity-25" cx="12" cy="12" r="10" stroke="currentColor" stroke-width="4"></circle>
+					<path class="opacity-75" fill="currentColor" d="M4 12a8 8 0 018-8V0C5.373 0 0 5.373 0 12h4z"></path>
+				</svg>
+				Loading…
+			</Button>
+
+		{:else if audioStore.status === 'generating'}
+			<div class="space-y-2">
+				<p class="text-xs text-zinc-400">Generating narration…</p>
+				<div class="w-full h-1.5 bg-zinc-700 rounded-full overflow-hidden">
+					<div
+						class="h-full bg-amber-400 rounded-full transition-none"
+						style="width: {audioStore.progress}%"
+					></div>
+				</div>
+				<p class="text-xs text-zinc-500 tabular-nums">{Math.round(audioStore.progress)}%</p>
+			</div>
+
+		{:else if audioStore.status === 'ready'}
+			<!-- Mini-bar is the canonical control surface — show a compact indicator here -->
+			<div class="flex items-center justify-between gap-3">
+				<div class="flex items-center gap-2 text-xs text-zinc-400">
+					{#if audioStore.isPlaying}
+						<svg class="w-3.5 h-3.5 text-amber-400 flex-shrink-0" fill="currentColor" viewBox="0 0 24 24">
+							<path d="M6 4h4v16H6V4zm8 0h4v16h-4V4z"/>
+						</svg>
+						<span>Playing — controls below</span>
+					{:else}
+						<svg class="w-3.5 h-3.5 flex-shrink-0 ml-0.5" fill="currentColor" viewBox="0 0 24 24">
+							<path d="M8 5v14l11-7z"/>
+						</svg>
+						<span>Paused — controls below</span>
+					{/if}
+					<span class="tabular-nums text-zinc-500">
+						{formatTime(audioStore.currentTime)} / {formatTime(audioStore.duration)}
+					</span>
+				</div>
+
+				<!-- Auto-next toggle (keep here as useful context) -->
+				{#if nextChapter !== null && nextChapter !== undefined}
+					<Button
+						variant="ghost"
+						size="sm"
+						class={cn('gap-1.5 text-xs flex-shrink-0', audioStore.autoNext ? 'text-amber-400 bg-amber-400/15 hover:bg-amber-400/25' : 'text-zinc-500')}
+						onclick={() => (audioStore.autoNext = !audioStore.autoNext)}
+						title={audioStore.autoNext ? `Auto-next on — will play Ch.${nextChapter} automatically` : 'Auto-next off'}
+						aria-pressed={audioStore.autoNext}
+					>
+						<svg class="w-3.5 h-3.5" fill="currentColor" viewBox="0 0 24 24">
+							<path d="M6 18l8.5-6L6 6v12zm8.5-6L23 6v12l-8.5-6z"/>
+						</svg>
+						Auto
+					</Button>
+				{/if}
+			</div>
+
+			<!-- Next chapter pre-fetch status (only when auto-next is on) -->
+			{#if audioStore.autoNext && nextChapter !== null && nextChapter !== undefined}
+				<div class="mt-2">
+					{#if audioStore.nextStatus === 'prefetching'}
+						<div class="flex items-center gap-2 text-xs text-zinc-500">
+							<svg class="w-3 h-3 animate-spin flex-shrink-0" fill="none" viewBox="0 0 24 24">
+								<circle class="opacity-25" cx="12" cy="12" r="10" stroke="currentColor" stroke-width="4"></circle>
+								<path class="opacity-75" fill="currentColor" d="M4 12a8 8 0 018-8V0C5.373 0 0 5.373 0 12h4z"></path>
+							</svg>
+							<span>Preparing Ch.{nextChapter}… {Math.round(audioStore.nextProgress)}%</span>
+						</div>
+					{:else if audioStore.nextStatus === 'prefetched'}
+						<p class="text-xs text-zinc-500 flex items-center gap-1">
+							<svg class="w-3 h-3 text-amber-400 flex-shrink-0" fill="currentColor" viewBox="0 0 24 24">
+								<path d="M9 16.17L4.83 12l-1.42 1.41L9 19 21 7l-1.41-1.41L9 16.17z"/>
+							</svg>
+							Ch.{nextChapter} ready
+						</p>
+					{:else if audioStore.nextStatus === 'failed'}
+						<p class="text-xs text-zinc-600">Ch.{nextChapter} will generate on navigate</p>
+					{/if}
+				</div>
+			{/if}
+		{/if}
+
+	{:else if audioStore.active}
+		<!-- ── A different chapter is currently playing ── -->
+		<div class="flex items-center justify-between gap-3">
+			<p class="text-xs text-zinc-400">
+				Now playing: {audioStore.chapterTitle || `Ch.${audioStore.chapter}`}
+			</p>
+			<Button variant="secondary" size="sm" class="flex-shrink-0" onclick={startPlayback}>
+				Load this chapter
+			</Button>
+		</div>
+
+	{:else}
+		<!-- ── Idle — nothing playing ── -->
+		<Button variant="default" size="sm" onclick={handlePlay}>
+			<svg class="w-3.5 h-3.5" fill="currentColor" viewBox="0 0 24 24">
+				<path d="M8 5v14l11-7z"/>
+			</svg>
+			Play narration
+		</Button>
+	{/if}
+</div>

v3/ui/src/lib/components/AvatarCropModal.svelte

@@ -0,0 +1,112 @@
+<script lang="ts">
+	import { onDestroy } from 'svelte';
+	import Cropper from 'cropperjs';
+	import type { default as CropperType } from 'cropperjs';
+	import 'cropperjs/dist/cropper.css';
+	import { Dialog, DialogHeader, DialogTitle, DialogFooter } from '$lib/components/ui/dialog';
+	import { Button } from '$lib/components/ui/button';
+
+	interface Props {
+		file: File;
+		onconfirm: (blob: Blob, mimeType: string) => void;
+		oncancel: () => void;
+	}
+
+	let { file, onconfirm, oncancel }: Props = $props();
+
+	let imgEl: HTMLImageElement | undefined = $state();
+	let cropper: CropperType | null = null;
+	let objectUrl = '';
+	let open = $state(true);
+
+	// Initialize cropper once the img element is bound and the file is known.
+	// Use a $effect so it runs after the DOM is ready (replaces onMount).
+	$effect(() => {
+		if (!imgEl || !file) return;
+
+		// Create the object URL and set src directly on the element (not via reactive
+		// state) so cropperjs sees the correct src before the image load event fires.
+		objectUrl = URL.createObjectURL(file);
+		imgEl.src = objectUrl;
+
+		// Cropperjs must be initialised inside the image's load event so it can
+		// measure the natural dimensions — if we call new Cropper() before the image
+		// has loaded, the crop canvas is blank/invisible.
+		const handleLoad = () => {
+			cropper = new Cropper(imgEl!, {
+				aspectRatio: 1,
+				viewMode: 1,
+				dragMode: 'move',
+				autoCropArea: 0.8,
+				restore: false,
+				guides: false,
+				center: true,
+				highlight: false,
+				cropBoxMovable: true,
+				cropBoxResizable: true,
+				toggleDragModeOnDblclick: false,
+				background: false
+			});
+		};
+
+		imgEl.addEventListener('load', handleLoad, { once: true });
+
+		return () => {
+			imgEl?.removeEventListener('load', handleLoad);
+			cropper?.destroy();
+			cropper = null;
+			URL.revokeObjectURL(objectUrl);
+			objectUrl = '';
+		};
+	});
+
+	onDestroy(() => {
+		cropper?.destroy();
+		if (objectUrl) URL.revokeObjectURL(objectUrl);
+	});
+
+	function confirm() {
+		if (!cropper) return;
+		const canvas = cropper.getCroppedCanvas({ width: 400, height: 400 });
+		const mimeType = file.type === 'image/webp' ? 'image/webp' : 'image/jpeg';
+		canvas.toBlob(
+			(blob: Blob | null) => {
+				if (blob) onconfirm(blob, mimeType);
+			},
+			mimeType,
+			0.9
+		);
+	}
+
+	function handleClose() {
+		open = false;
+		oncancel();
+	}
+</script>
+
+<Dialog bind:open onclose={handleClose} class="max-w-sm">
+	<DialogHeader>
+		<DialogTitle>Crop profile picture</DialogTitle>
+	</DialogHeader>
+
+	<!-- Cropper image container — overflow must be visible so cropperjs can
+	     render the crop canvas outside the natural image bounds. The fixed
+	     height gives cropperjs a stable container to size itself against. -->
+	<div class="px-5">
+		<div class="rounded-xl bg-zinc-800" style="height: 300px; position: relative;">
+			<img
+				bind:this={imgEl}
+				alt="Crop preview"
+				style="display:block; max-width:100%; max-height:100%;"
+			/>
+		</div>
+		<p class="text-xs text-zinc-500 text-center mt-3">
+			Drag to reposition · pinch or scroll to zoom · drag corners to resize
+		</p>
+	</div>
+
+	<DialogFooter>
+		<Button variant="outline" onclick={handleClose}>Cancel</Button>
+		<Button variant="default" onclick={confirm}>Use photo</Button>
+	</DialogFooter>
+</Dialog>

v3/ui/src/lib/components/CommentsSection.svelte

@@ -0,0 +1,561 @@
+<script lang="ts">
+	import { Button } from '$lib/components/ui/button';
+	import { Textarea } from '$lib/components/ui/textarea';
+	import { cn } from '$lib/utils';
+
+	interface BookComment {
+		id: string;
+		slug: string;
+		user_id: string;
+		username: string;
+		body: string;
+		upvotes: number;
+		downvotes: number;
+		created: string;
+		parent_id?: string;
+		replies?: BookComment[];
+	}
+
+	let {
+		slug,
+		isLoggedIn = false,
+		currentUserId = ''
+	}: {
+		slug: string;
+		isLoggedIn?: boolean;
+		currentUserId?: string;
+	} = $props();
+
+	// ── State ─────────────────────────────────────────────────────────────────
+	let comments = $state<BookComment[]>([]);
+	let myVotes = $state<Record<string, 'up' | 'down'>>({});
+	let avatarUrls = $state<Record<string, string>>({});
+	let loading = $state(true);
+	let loadError = $state('');
+
+	// Top-level new comment
+	let newBody = $state('');
+	let posting = $state(false);
+	let postError = $state('');
+
+	// Sort
+	let sort = $state<'new' | 'top'>('top');
+
+	// Reply state: which comment is being replied to
+	let replyingTo = $state<string | null>(null); // comment id
+	let replyBody = $state('');
+	let replyPosting = $state(false);
+	let replyError = $state('');
+
+	// Delete in-flight set
+	let deletingIds = $state(new Set<string>());
+
+	// Per-comment vote inflight set (prevents double-clicks)
+	let votingIds = $state(new Set<string>());
+
+	// ── Load comments ─────────────────────────────────────────────────────────
+	async function loadComments() {
+		loading = true;
+		loadError = '';
+		try {
+			const res = await fetch(
+				`/api/comments/${encodeURIComponent(slug)}?sort=${sort}`
+			);
+			if (!res.ok) throw new Error(`${res.status}`);
+			const data = await res.json();
+			comments = data.comments ?? [];
+			myVotes = data.myVotes ?? {};
+			avatarUrls = data.avatarUrls ?? {};
+		} catch (e) {
+			loadError = 'Failed to load comments.';
+		} finally {
+			loading = false;
+		}
+	}
+
+	$effect(() => {
+		loadComments();
+	});
+
+	// Re-load when sort changes (after initial mount)
+	let firstLoad = true;
+	$effect(() => {
+		// Read sort to create a dependency
+		const _ = sort;
+		if (firstLoad) { firstLoad = false; return; }
+		loadComments();
+	});
+
+	// ── Post top-level comment ────────────────────────────────────────────────
+	async function postComment() {
+		const text = newBody.trim();
+		if (!text || posting) return;
+		if (text.length > 2000) { postError = 'Comment is too long (max 2000 characters).'; return; }
+		posting = true;
+		postError = '';
+		try {
+			const res = await fetch(`/api/comments/${encodeURIComponent(slug)}`, {
+				method: 'POST',
+				headers: { 'Content-Type': 'application/json' },
+				body: JSON.stringify({ body: text })
+			});
+			if (res.status === 401) { postError = 'You must be logged in to comment.'; return; }
+			if (!res.ok) {
+				const err = await res.json().catch(() => ({}));
+				postError = err.message ?? 'Failed to post comment.';
+				return;
+			}
+			const created: BookComment = await res.json();
+			created.replies = [];
+			// Prepend for 'new', or re-sort for 'top'
+			if (sort === 'new') {
+				comments = [created, ...comments];
+			} else {
+				comments = [created, ...comments]; // new comment has 0 score, goes to end after sort would happen
+			}
+			newBody = '';
+		} catch {
+			postError = 'Failed to post comment.';
+		} finally {
+			posting = false;
+		}
+	}
+
+	// ── Post reply ────────────────────────────────────────────────────────────
+	async function postReply(parentId: string) {
+		const text = replyBody.trim();
+		if (!text || replyPosting) return;
+		if (text.length > 2000) { replyError = 'Reply is too long (max 2000 characters).'; return; }
+		replyPosting = true;
+		replyError = '';
+		try {
+			const res = await fetch(`/api/comments/${encodeURIComponent(slug)}`, {
+				method: 'POST',
+				headers: { 'Content-Type': 'application/json' },
+				body: JSON.stringify({ body: text, parent_id: parentId })
+			});
+			if (res.status === 401) { replyError = 'You must be logged in to reply.'; return; }
+			if (!res.ok) {
+				const err = await res.json().catch(() => ({}));
+				replyError = err.message ?? 'Failed to post reply.';
+				return;
+			}
+			const created: BookComment = await res.json();
+			// Append to the parent's replies list
+			comments = comments.map((c) => {
+				if (c.id !== parentId) return c;
+				return { ...c, replies: [...(c.replies ?? []), created] };
+			});
+			replyBody = '';
+			replyingTo = null;
+		} catch {
+			replyError = 'Failed to post reply.';
+		} finally {
+			replyPosting = false;
+		}
+	}
+
+	// ── Delete ────────────────────────────────────────────────────────────────
+	async function deleteComment(commentId: string, parentId?: string) {
+		if (deletingIds.has(commentId)) return;
+		deletingIds = new Set([...deletingIds, commentId]);
+		try {
+			const res = await fetch(`/api/comment/${commentId}`, { method: 'DELETE' });
+			if (!res.ok) return;
+			if (parentId) {
+				// Remove reply from parent
+				comments = comments.map((c) => {
+					if (c.id !== parentId) return c;
+					return { ...c, replies: (c.replies ?? []).filter((r) => r.id !== commentId) };
+				});
+			} else {
+				// Remove top-level comment
+				comments = comments.filter((c) => c.id !== commentId);
+			}
+		} finally {
+			const next = new Set(deletingIds);
+			next.delete(commentId);
+			deletingIds = next;
+		}
+	}
+
+	// ── Vote ──────────────────────────────────────────────────────────────────
+	async function vote(commentId: string, v: 'up' | 'down', parentId?: string) {
+		if (votingIds.has(commentId)) return;
+		votingIds = new Set([...votingIds, commentId]);
+		try {
+			const res = await fetch(`/api/comment/${commentId}/vote`, {
+				method: 'POST',
+				headers: { 'Content-Type': 'application/json' },
+				body: JSON.stringify({ vote: v })
+			});
+			if (!res.ok) return;
+			const updated: BookComment = await res.json();
+			// Update comment in list (handle both top-level and replies)
+			if (parentId) {
+				comments = comments.map((c) => {
+					if (c.id !== parentId) return c;
+					return {
+						...c,
+						replies: (c.replies ?? []).map((r) => (r.id === commentId ? updated : r))
+					};
+				});
+			} else {
+				comments = comments.map((c) => (c.id === commentId ? { ...updated, replies: c.replies } : c));
+			}
+			// Update myVotes: toggle off if same, else set new vote
+			const prev = myVotes[commentId];
+			if (prev === v) {
+				const next = { ...myVotes };
+				delete next[commentId];
+				myVotes = next;
+			} else {
+				myVotes = { ...myVotes, [commentId]: v };
+			}
+		} finally {
+			const next = new Set(votingIds);
+			next.delete(commentId);
+			votingIds = next;
+		}
+	}
+
+	// ── Helpers ───────────────────────────────────────────────────────────────
+	function initials(username: string): string {
+		const name = username.trim() || '?';
+		return name.slice(0, 2).toUpperCase();
+	}
+
+	function formatDate(iso: string): string {
+		try {
+			const date = new Date(iso);
+			const now = Date.now();
+			const diffMs = now - date.getTime();
+			const diffMins = Math.floor(diffMs / 60_000);
+			if (diffMins < 1) return 'just now';
+			if (diffMins < 60) return `${diffMins}m ago`;
+			const diffHours = Math.floor(diffMins / 60);
+			if (diffHours < 24) return `${diffHours}h ago`;
+			const diffDays = Math.floor(diffHours / 24);
+			if (diffDays < 30) return `${diffDays}d ago`;
+			return date.toLocaleDateString(undefined, { year: 'numeric', month: 'short', day: 'numeric' });
+		} catch {
+			return iso;
+		}
+	}
+
+	const charCount = $derived(newBody.length);
+	const charOver = $derived(charCount > 2000);
+	const replyCharCount = $derived(replyBody.length);
+	const replyCharOver = $derived(replyCharCount > 2000);
+
+	const totalCount = $derived(
+		comments.reduce((n, c) => n + 1 + (c.replies?.length ?? 0), 0)
+	);
+</script>
+
+<div class="mt-10">
+	<!-- Header + sort controls -->
+	<div class="flex items-center justify-between gap-3 mb-4 flex-wrap">
+		<h2 class="text-base font-semibold text-zinc-200">
+			Comments
+			{#if !loading && totalCount > 0}
+				<span class="text-zinc-500 font-normal text-sm ml-1">({totalCount})</span>
+			{/if}
+		</h2>
+
+	<!-- Sort tabs -->
+	{#if !loading && comments.length > 0}
+		<div class="flex items-center gap-1 text-xs rounded-lg bg-zinc-800/60 p-1">
+			<Button
+				variant="ghost"
+				size="sm"
+				class={cn('px-2.5 py-1 h-auto text-xs rounded-md', sort === 'top' ? 'bg-zinc-700 text-zinc-100 hover:bg-zinc-700' : 'text-zinc-500 hover:text-zinc-300')}
+				onclick={() => (sort = 'top')}
+			>Top</Button>
+			<Button
+				variant="ghost"
+				size="sm"
+				class={cn('px-2.5 py-1 h-auto text-xs rounded-md', sort === 'new' ? 'bg-zinc-700 text-zinc-100 hover:bg-zinc-700' : 'text-zinc-500 hover:text-zinc-300')}
+				onclick={() => (sort = 'new')}
+			>New</Button>
+		</div>
+	{/if}
+	</div>
+
+	<!-- Post form -->
+	<div class="mb-6">
+		{#if isLoggedIn}
+			<div class="flex flex-col gap-2">
+				<Textarea
+					bind:value={newBody}
+					placeholder="Write a comment…"
+					rows={3}
+				/>
+				<div class="flex items-center justify-between gap-3">
+					<span class={cn('text-xs tabular-nums', charOver ? 'text-red-400' : 'text-zinc-600')}>
+						{charCount}/2000
+					</span>
+					<div class="flex items-center gap-3">
+						{#if postError}
+							<span class="text-xs text-red-400">{postError}</span>
+						{/if}
+						<Button
+							variant="default"
+							size="sm"
+							disabled={posting || !newBody.trim() || charOver}
+							onclick={postComment}
+						>
+							{posting ? 'Posting…' : 'Post'}
+						</Button>
+					</div>
+				</div>
+			</div>
+		{:else}
+			<p class="text-sm text-zinc-500">
+				<a href="/auth/login" class="text-amber-400 hover:text-amber-300 transition-colors">Log in</a>
+				to leave a comment.
+			</p>
+		{/if}
+	</div>
+
+	<!-- Comment list -->
+	{#if loading}
+		<div class="flex flex-col gap-3">
+			{#each Array(3) as _}
+				<div class="rounded-lg bg-zinc-800/50 p-4 animate-pulse">
+					<div class="h-3 w-24 bg-zinc-700 rounded mb-3"></div>
+					<div class="h-3 w-full bg-zinc-700/60 rounded mb-2"></div>
+					<div class="h-3 w-3/4 bg-zinc-700/60 rounded"></div>
+				</div>
+			{/each}
+		</div>
+	{:else if loadError}
+		<p class="text-sm text-red-400">{loadError}</p>
+	{:else if comments.length === 0}
+		<p class="text-sm text-zinc-500">No comments yet. Be the first!</p>
+	{:else}
+		<div class="flex flex-col gap-3">
+			{#each comments as comment (comment.id)}
+				{@const myVote = myVotes[comment.id]}
+				{@const voting = votingIds.has(comment.id)}
+				{@const deleting = deletingIds.has(comment.id)}
+				{@const isOwner = isLoggedIn && currentUserId === comment.user_id}
+
+				<div class="rounded-lg bg-zinc-800/50 border border-zinc-700/50 px-4 py-3 flex flex-col gap-2 {deleting ? 'opacity-50' : ''}">
+					<!-- Header -->
+					<div class="flex items-center gap-2 flex-wrap">
+						{#if avatarUrls[comment.user_id]}
+							<img src={avatarUrls[comment.user_id]} alt={comment.username} class="w-6 h-6 rounded-full object-cover flex-shrink-0" />
+						{:else}
+							<div class="w-6 h-6 rounded-full bg-zinc-700 flex items-center justify-center flex-shrink-0">
+								<span class="text-[9px] font-semibold text-zinc-300 leading-none">{initials(comment.username)}</span>
+							</div>
+						{/if}
+						{#if comment.username}
+						<a href="/users/{comment.username}" class="text-sm font-medium text-zinc-200 hover:text-amber-400 transition-colors">{comment.username}</a>
+					{:else}
+						<span class="text-sm font-medium text-zinc-400">Anonymous</span>
+					{/if}
+						<span class="text-zinc-600 text-xs">&middot;</span>
+						<span class="text-xs text-zinc-500">{formatDate(comment.created)}</span>
+					</div>
+
+					<!-- Body -->
+					<p class="text-sm text-zinc-300 leading-relaxed whitespace-pre-wrap break-words">{comment.body}</p>
+
+				<!-- Actions row: votes + reply + delete -->
+				<div class="flex items-center gap-3 pt-1 flex-wrap">
+					<!-- Upvote -->
+					<Button
+						variant="ghost"
+						size="sm"
+						class={cn('h-auto px-1 py-0 gap-1 text-xs', myVote === 'up' ? 'text-amber-400' : 'text-zinc-500 hover:text-zinc-300')}
+						disabled={voting}
+						onclick={() => vote(comment.id, 'up')}
+						title="Upvote"
+					>
+						<svg class="w-3.5 h-3.5" fill="none" stroke="currentColor" viewBox="0 0 24 24" stroke-width="2">
+							<path stroke-linecap="round" stroke-linejoin="round" d="M14 10h4.764a2 2 0 011.789 2.894l-3.5 7A2 2 0 0115.263 21h-4.017c-.163 0-.326-.02-.485-.06L7 20m7-10V5a2 2 0 00-2-2h-.095c-.5 0-.905.405-.905.905 0 .714-.211 1.412-.608 2.006L7 11v9m7-10h-2M7 20H5a2 2 0 01-2-2v-6a2 2 0 012-2h2.5"/>
+						</svg>
+						<span class="tabular-nums">{comment.upvotes ?? 0}</span>
+					</Button>
+
+					<!-- Downvote -->
+					<Button
+						variant="ghost"
+						size="sm"
+						class={cn('h-auto px-1 py-0 gap-1 text-xs', myVote === 'down' ? 'text-red-400' : 'text-zinc-500 hover:text-zinc-300')}
+						disabled={voting}
+						onclick={() => vote(comment.id, 'down')}
+						title="Downvote"
+					>
+						<svg class="w-3.5 h-3.5" fill="none" stroke="currentColor" viewBox="0 0 24 24" stroke-width="2">
+							<path stroke-linecap="round" stroke-linejoin="round" d="M10 14H5.236a2 2 0 01-1.789-2.894l3.5-7A2 2 0 018.736 3h4.018a2 2 0 01.485.06l3.76.94m-7 10v5a2 2 0 002 2h.096c.5 0 .905-.405.905-.904 0-.715.211-1.413.608-2.008L17 13V4m-7 10h2m5-10h2a2 2 0 012 2v6a2 2 0 01-2 2h-2.5"/>
+						</svg>
+						<span class="tabular-nums">{comment.downvotes ?? 0}</span>
+					</Button>
+
+					<!-- Reply button -->
+					{#if isLoggedIn}
+						<Button
+							variant="ghost"
+							size="sm"
+							class={cn('h-auto px-1 py-0 gap-1 text-xs', replyingTo === comment.id ? 'text-amber-400' : 'text-zinc-500 hover:text-zinc-300')}
+							onclick={() => {
+								if (replyingTo === comment.id) {
+									replyingTo = null;
+									replyBody = '';
+									replyError = '';
+								} else {
+									replyingTo = comment.id;
+									replyBody = '';
+									replyError = '';
+								}
+							}}
+						>
+							<svg class="w-3.5 h-3.5" fill="none" stroke="currentColor" viewBox="0 0 24 24" stroke-width="2">
+								<path stroke-linecap="round" stroke-linejoin="round" d="M3 10h10a8 8 0 018 8v2M3 10l6 6m-6-6l6-6"/>
+							</svg>
+							Reply
+						</Button>
+					{/if}
+
+					<!-- Delete (owner only) -->
+					{#if isOwner}
+						<Button
+							variant="ghost"
+							size="sm"
+							class="h-auto px-1 py-0 gap-1 text-xs text-zinc-600 hover:text-red-400 ml-auto"
+							disabled={deleting}
+							onclick={() => deleteComment(comment.id)}
+							title="Delete comment"
+						>
+							<svg class="w-3.5 h-3.5" fill="none" stroke="currentColor" viewBox="0 0 24 24" stroke-width="2">
+								<path stroke-linecap="round" stroke-linejoin="round" d="M19 7l-.867 12.142A2 2 0 0116.138 21H7.862a2 2 0 01-1.995-1.858L5 7m5 4v6m4-6v6m1-10V4a1 1 0 00-1-1h-4a1 1 0 00-1 1v3M4 7h16"/>
+							</svg>
+							Delete
+						</Button>
+					{/if}
+				</div>
+
+				<!-- Inline reply form -->
+				{#if replyingTo === comment.id}
+					<div class="mt-1 flex flex-col gap-2 pl-2 border-l-2 border-zinc-700">
+						<Textarea
+							bind:value={replyBody}
+							placeholder="Write a reply…"
+							rows={2}
+						/>
+						<div class="flex items-center justify-between gap-2">
+							<span class={cn('text-xs tabular-nums', replyCharOver ? 'text-red-400' : 'text-zinc-600')}>
+								{replyCharCount}/2000
+							</span>
+							<div class="flex items-center gap-2">
+								{#if replyError}
+									<span class="text-xs text-red-400">{replyError}</span>
+								{/if}
+								<Button
+									variant="ghost"
+									size="sm"
+									class="text-zinc-400 hover:text-zinc-200"
+									onclick={() => { replyingTo = null; replyBody = ''; replyError = ''; }}
+								>Cancel</Button>
+								<Button
+									variant="default"
+									size="sm"
+									disabled={replyPosting || !replyBody.trim() || replyCharOver}
+									onclick={() => postReply(comment.id)}
+								>
+									{replyPosting ? 'Posting…' : 'Reply'}
+								</Button>
+							</div>
+						</div>
+					</div>
+				{/if}
+
+					<!-- Replies -->
+					{#if comment.replies && comment.replies.length > 0}
+						<div class="mt-1 flex flex-col gap-2 pl-3 border-l-2 border-zinc-700/60">
+							{#each comment.replies as reply (reply.id)}
+								{@const replyVote = myVotes[reply.id]}
+								{@const replyVoting = votingIds.has(reply.id)}
+								{@const replyDeleting = deletingIds.has(reply.id)}
+								{@const replyIsOwner = isLoggedIn && currentUserId === reply.user_id}
+
+								<div class="rounded-md bg-zinc-800/30 px-3 py-2.5 flex flex-col gap-1.5 {replyDeleting ? 'opacity-50' : ''}">
+									<!-- Reply header -->
+									<div class="flex items-center gap-2 flex-wrap">
+										{#if avatarUrls[reply.user_id]}
+											<img src={avatarUrls[reply.user_id]} alt={reply.username} class="w-5 h-5 rounded-full object-cover flex-shrink-0" />
+										{:else}
+											<div class="w-5 h-5 rounded-full bg-zinc-700 flex items-center justify-center flex-shrink-0">
+												<span class="text-[8px] font-semibold text-zinc-300 leading-none">{initials(reply.username)}</span>
+											</div>
+										{/if}
+										{#if reply.username}
+										<a href="/users/{reply.username}" class="text-xs font-medium text-zinc-300 hover:text-amber-400 transition-colors">{reply.username}</a>
+									{:else}
+										<span class="text-xs font-medium text-zinc-400">Anonymous</span>
+									{/if}
+										<span class="text-zinc-600 text-xs">&middot;</span>
+										<span class="text-xs text-zinc-500">{formatDate(reply.created)}</span>
+									</div>
+
+									<!-- Reply body -->
+									<p class="text-sm text-zinc-300 leading-relaxed whitespace-pre-wrap break-words">{reply.body}</p>
+
+								<!-- Reply actions -->
+								<div class="flex items-center gap-3 pt-0.5">
+									<Button
+										variant="ghost"
+										size="sm"
+										class={cn('h-auto px-1 py-0 gap-1 text-xs', replyVote === 'up' ? 'text-amber-400' : 'text-zinc-500 hover:text-zinc-300')}
+										disabled={replyVoting}
+										onclick={() => vote(reply.id, 'up', comment.id)}
+										title="Upvote"
+									>
+										<svg class="w-3 h-3" fill="none" stroke="currentColor" viewBox="0 0 24 24" stroke-width="2">
+											<path stroke-linecap="round" stroke-linejoin="round" d="M14 10h4.764a2 2 0 011.789 2.894l-3.5 7A2 2 0 0115.263 21h-4.017c-.163 0-.326-.02-.485-.06L7 20m7-10V5a2 2 0 00-2-2h-.095c-.5 0-.905.405-.905.905 0 .714-.211 1.412-.608 2.006L7 11v9m7-10h-2M7 20H5a2 2 0 01-2-2v-6a2 2 0 012-2h2.5"/>
+										</svg>
+										<span class="tabular-nums">{reply.upvotes ?? 0}</span>
+									</Button>
+
+									<Button
+										variant="ghost"
+										size="sm"
+										class={cn('h-auto px-1 py-0 gap-1 text-xs', replyVote === 'down' ? 'text-red-400' : 'text-zinc-500 hover:text-zinc-300')}
+										disabled={replyVoting}
+										onclick={() => vote(reply.id, 'down', comment.id)}
+										title="Downvote"
+									>
+										<svg class="w-3 h-3" fill="none" stroke="currentColor" viewBox="0 0 24 24" stroke-width="2">
+											<path stroke-linecap="round" stroke-linejoin="round" d="M10 14H5.236a2 2 0 01-1.789-2.894l3.5-7A2 2 0 018.736 3h4.018a2 2 0 01.485.06l3.76.94m-7 10v5a2 2 0 002 2h.096c.5 0 .905-.405.905-.904 0-.715.211-1.413.608-2.008L17 13V4m-7 10h2m5-10h2a2 2 0 012 2v6a2 2 0 01-2 2h-2.5"/>
+										</svg>
+										<span class="tabular-nums">{reply.downvotes ?? 0}</span>
+									</Button>
+
+									{#if replyIsOwner}
+										<Button
+											variant="ghost"
+											size="sm"
+											class="h-auto px-1 py-0 gap-1 text-xs text-zinc-600 hover:text-red-400 ml-auto"
+											disabled={replyDeleting}
+											onclick={() => deleteComment(reply.id, comment.id)}
+											title="Delete reply"
+										>
+											<svg class="w-3 h-3" fill="none" stroke="currentColor" viewBox="0 0 24 24" stroke-width="2">
+												<path stroke-linecap="round" stroke-linejoin="round" d="M19 7l-.867 12.142A2 2 0 0116.138 21H7.862a2 2 0 01-1.995-1.858L5 7m5 4v6m4-6v6m1-10V4a1 1 0 00-1-1h-4a1 1 0 00-1 1v3M4 7h16"/>
+											</svg>
+											Delete
+										</Button>
+									{/if}
+								</div>
+								</div>
+							{/each}
+						</div>
+					{/if}
+				</div>
+			{/each}
+		</div>
+	{/if}
+</div>

v3/ui/src/lib/components/ui/badge/Badge.svelte

@@ -0,0 +1,28 @@
+<script lang="ts">
+	import type { Snippet } from 'svelte';
+	import { cn } from '$lib/utils';
+
+	type Variant = 'default' | 'secondary' | 'outline' | 'destructive';
+
+	interface Props {
+		variant?: Variant;
+		class?: string;
+		children?: Snippet;
+	}
+
+	let { variant = 'default', class: className = '', children }: Props = $props();
+
+	const base =
+		'inline-flex items-center rounded-full border px-2.5 py-0.5 text-xs font-semibold transition-colors focus:outline-none';
+
+	const variants: Record<Variant, string> = {
+		default:     'border-transparent bg-amber-400 text-zinc-900',
+		secondary:   'border-transparent bg-zinc-700 text-zinc-200',
+		outline:     'border-zinc-600 text-zinc-300',
+		destructive: 'border-transparent bg-red-500/20 text-red-400',
+	};
+</script>
+
+<span class={cn(base, variants[variant], className)}>
+	{@render children?.()}
+</span>

v3/ui/src/lib/components/ui/badge/index.ts

@@ -0,0 +1 @@
+export { default as Badge } from './Badge.svelte';

v3/ui/src/lib/components/ui/button/Button.svelte

@@ -0,0 +1,58 @@
+<script lang="ts">
+	import type { Snippet } from 'svelte';
+	import { cn } from '$lib/utils';
+
+	type Variant = 'default' | 'secondary' | 'outline' | 'ghost' | 'destructive' | 'link';
+	type Size = 'default' | 'sm' | 'lg' | 'icon';
+
+	interface Props {
+		variant?: Variant;
+		size?: Size;
+		disabled?: boolean;
+		type?: 'button' | 'submit' | 'reset';
+		class?: string;
+		onclick?: (e: MouseEvent) => void;
+		children?: Snippet;
+		[key: string]: unknown;
+	}
+
+	let {
+		variant = 'default',
+		size = 'default',
+		disabled = false,
+		type = 'button',
+		class: className = '',
+		onclick,
+		children,
+		...rest
+	}: Props = $props();
+
+	const base =
+		'inline-flex items-center justify-center gap-2 whitespace-nowrap rounded-md text-sm font-medium transition-colors focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-amber-400 focus-visible:ring-offset-2 focus-visible:ring-offset-zinc-900 disabled:pointer-events-none disabled:opacity-50';
+
+	const variants: Record<Variant, string> = {
+		default:     'bg-amber-400 text-zinc-900 hover:bg-amber-300',
+		secondary:   'bg-zinc-700 text-zinc-200 hover:bg-zinc-600',
+		outline:     'border border-zinc-600 bg-transparent text-zinc-300 hover:bg-zinc-800 hover:text-zinc-100',
+		ghost:       'bg-transparent text-zinc-400 hover:bg-zinc-800 hover:text-zinc-100',
+		destructive: 'bg-red-500/20 text-red-400 hover:bg-red-500/30 hover:text-red-300',
+		link:        'text-amber-400 underline-offset-4 hover:underline bg-transparent p-0 h-auto',
+	};
+
+	const sizes: Record<Size, string> = {
+		default: 'h-9 px-4 py-2',
+		sm:      'h-8 rounded-md px-3 text-xs',
+		lg:      'h-11 rounded-md px-8',
+		icon:    'h-9 w-9',
+	};
+</script>
+
+<button
+	{type}
+	{disabled}
+	class={cn(base, variants[variant], sizes[size], className)}
+	{onclick}
+	{...rest}
+>
+	{@render children?.()}
+</button>

v3/ui/src/lib/components/ui/button/index.ts

@@ -0,0 +1 @@
+export { default as Button } from './Button.svelte';

v3/ui/src/lib/components/ui/card/Card.svelte

@@ -0,0 +1,15 @@
+<script lang="ts">
+	import type { Snippet } from 'svelte';
+	import { cn } from '$lib/utils';
+
+	interface Props {
+		class?: string;
+		children?: Snippet;
+	}
+
+	let { class: className = '', children }: Props = $props();
+</script>
+
+<div class={cn('rounded-xl border border-zinc-700 bg-zinc-800/50', className)}>
+	{@render children?.()}
+</div>

v3/ui/src/lib/components/ui/card/CardContent.svelte

@@ -0,0 +1,15 @@
+<script lang="ts">
+	import type { Snippet } from 'svelte';
+	import { cn } from '$lib/utils';
+
+	interface Props {
+		class?: string;
+		children?: Snippet;
+	}
+
+	let { class: className = '', children }: Props = $props();
+</script>
+
+<div class={cn('p-5 pt-0', className)}>
+	{@render children?.()}
+</div>

v3/ui/src/lib/components/ui/card/CardDescription.svelte

@@ -0,0 +1,15 @@
+<script lang="ts">
+	import type { Snippet } from 'svelte';
+	import { cn } from '$lib/utils';
+
+	interface Props {
+		class?: string;
+		children?: Snippet;
+	}
+
+	let { class: className = '', children }: Props = $props();
+</script>
+
+<p class={cn('text-sm text-zinc-400', className)}>
+	{@render children?.()}
+</p>

v3/ui/src/lib/components/ui/card/CardFooter.svelte

@@ -0,0 +1,15 @@
+<script lang="ts">
+	import type { Snippet } from 'svelte';
+	import { cn } from '$lib/utils';
+
+	interface Props {
+		class?: string;
+		children?: Snippet;
+	}
+
+	let { class: className = '', children }: Props = $props();
+</script>
+
+<div class={cn('flex items-center p-5 pt-0', className)}>
+	{@render children?.()}
+</div>

v3/ui/src/lib/components/ui/card/CardHeader.svelte

@@ -0,0 +1,15 @@
+<script lang="ts">
+	import type { Snippet } from 'svelte';
+	import { cn } from '$lib/utils';
+
+	interface Props {
+		class?: string;
+		children?: Snippet;
+	}
+
+	let { class: className = '', children }: Props = $props();
+</script>
+
+<div class={cn('flex flex-col space-y-1.5 p-5', className)}>
+	{@render children?.()}
+</div>

v3/ui/src/lib/components/ui/card/CardTitle.svelte

@@ -0,0 +1,15 @@
+<script lang="ts">
+	import type { Snippet } from 'svelte';
+	import { cn } from '$lib/utils';
+
+	interface Props {
+		class?: string;
+		children?: Snippet;
+	}
+
+	let { class: className = '', children }: Props = $props();
+</script>
+
+<h3 class={cn('font-semibold leading-none tracking-tight text-zinc-100', className)}>
+	{@render children?.()}
+</h3>

v3/ui/src/lib/components/ui/card/index.ts

@@ -0,0 +1,6 @@
+export { default as Card } from './Card.svelte';
+export { default as CardHeader } from './CardHeader.svelte';
+export { default as CardTitle } from './CardTitle.svelte';
+export { default as CardDescription } from './CardDescription.svelte';
+export { default as CardContent } from './CardContent.svelte';
+export { default as CardFooter } from './CardFooter.svelte';

v3/ui/src/lib/components/ui/dialog/Dialog.svelte

@@ -0,0 +1,43 @@
+<script lang="ts">
+	import type { Snippet } from 'svelte';
+	import { cn } from '$lib/utils';
+
+	interface Props {
+		open?: boolean;
+		onclose?: () => void;
+		class?: string;
+		children?: Snippet;
+	}
+
+	let { open = $bindable(false), onclose, class: className = '', children }: Props = $props();
+
+	function handleBackdropClick(e: MouseEvent) {
+		if (e.target === e.currentTarget) {
+			open = false;
+			onclose?.();
+		}
+	}
+
+	function handleKeyDown(e: KeyboardEvent) {
+		if (e.key === 'Escape') {
+			open = false;
+			onclose?.();
+		}
+	}
+</script>
+
+<svelte:window onkeydown={handleKeyDown} />
+
+{#if open}
+	<!-- Backdrop -->
+	<div
+		class="fixed inset-0 z-50 flex items-center justify-center bg-black/70 backdrop-blur-sm p-4"
+		role="dialog"
+		aria-modal="true"
+		onclick={handleBackdropClick}
+	>
+		<div class={cn('bg-zinc-900 rounded-2xl border border-zinc-700 shadow-2xl w-full max-w-sm', className)}>
+			{@render children?.()}
+		</div>
+	</div>
+{/if}

v3/ui/src/lib/components/ui/dialog/DialogContent.svelte

@@ -0,0 +1,15 @@
+<script lang="ts">
+	import type { Snippet } from 'svelte';
+	import { cn } from '$lib/utils';
+
+	interface Props {
+		class?: string;
+		children?: Snippet;
+	}
+
+	let { class: className = '', children }: Props = $props();
+</script>
+
+<div class={cn('flex flex-col gap-4 p-5', className)}>
+	{@render children?.()}
+</div>

v3/ui/src/lib/components/ui/dialog/DialogFooter.svelte

@@ -0,0 +1,15 @@
+<script lang="ts">
+	import type { Snippet } from 'svelte';
+	import { cn } from '$lib/utils';
+
+	interface Props {
+		class?: string;
+		children?: Snippet;
+	}
+
+	let { class: className = '', children }: Props = $props();
+</script>
+
+<div class={cn('flex items-center justify-end gap-2 px-5 pb-5', className)}>
+	{@render children?.()}
+</div>

v3/ui/src/lib/components/ui/dialog/DialogHeader.svelte

@@ -0,0 +1,15 @@
+<script lang="ts">
+	import type { Snippet } from 'svelte';
+	import { cn } from '$lib/utils';
+
+	interface Props {
+		class?: string;
+		children?: Snippet;
+	}
+
+	let { class: className = '', children }: Props = $props();
+</script>
+
+<div class={cn('flex flex-col space-y-1.5 px-5 pt-5', className)}>
+	{@render children?.()}
+</div>

v3/ui/src/lib/components/ui/dialog/DialogTitle.svelte

@@ -0,0 +1,15 @@
+<script lang="ts">
+	import type { Snippet } from 'svelte';
+	import { cn } from '$lib/utils';
+
+	interface Props {
+		class?: string;
+		children?: Snippet;
+	}
+
+	let { class: className = '', children }: Props = $props();
+</script>
+
+<h2 class={cn('text-base font-semibold leading-none tracking-tight text-zinc-100', className)}>
+	{@render children?.()}
+</h2>

v3/ui/src/lib/components/ui/dialog/index.ts

@@ -0,0 +1,5 @@
+export { default as Dialog } from './Dialog.svelte';
+export { default as DialogContent } from './DialogContent.svelte';
+export { default as DialogHeader } from './DialogHeader.svelte';
+export { default as DialogTitle } from './DialogTitle.svelte';
+export { default as DialogFooter } from './DialogFooter.svelte';

v3/ui/src/lib/components/ui/separator/Separator.svelte

@@ -0,0 +1,19 @@
+<script lang="ts">
+	import { cn } from '$lib/utils';
+
+	interface Props {
+		class?: string;
+		orientation?: 'horizontal' | 'vertical';
+	}
+
+	let { class: className = '', orientation = 'horizontal' }: Props = $props();
+</script>
+
+<div
+	role="separator"
+	class={cn(
+		'shrink-0 bg-zinc-700',
+		orientation === 'horizontal' ? 'h-px w-full' : 'h-full w-px',
+		className
+	)}
+></div>

v3/ui/src/lib/components/ui/separator/index.ts

@@ -0,0 +1 @@
+export { default as Separator } from './Separator.svelte';

v3/ui/src/lib/components/ui/textarea/Textarea.svelte

@@ -0,0 +1,41 @@
+<script lang="ts">
+	import { cn } from '$lib/utils';
+
+	interface Props {
+		value?: string;
+		placeholder?: string;
+		rows?: number;
+		disabled?: boolean;
+		class?: string;
+		onchange?: (e: Event) => void;
+		oninput?: (e: Event) => void;
+		[key: string]: unknown;
+	}
+
+	let {
+		value = $bindable(''),
+		placeholder = '',
+		rows = 3,
+		disabled = false,
+		class: className = '',
+		onchange,
+		oninput,
+		...rest
+	}: Props = $props();
+</script>
+
+<textarea
+	bind:value
+	{placeholder}
+	{rows}
+	{disabled}
+	class={cn(
+		'flex w-full rounded-lg border border-zinc-700 bg-zinc-800 px-3 py-2 text-sm text-zinc-200 placeholder-zinc-500 resize-none transition-colors',
+		'focus:outline-none focus:border-amber-400',
+		'disabled:cursor-not-allowed disabled:opacity-50',
+		className
+	)}
+	{onchange}
+	{oninput}
+	{...rest}
+></textarea>

v3/ui/src/lib/components/ui/textarea/index.ts

@@ -0,0 +1 @@
+export { default as Textarea } from './Textarea.svelte';

v3/ui/src/lib/index.ts

@@ -0,0 +1 @@
+// place files you want to import through the `$lib` alias in this folder.

v3/ui/src/lib/server/logger.ts

@@ -0,0 +1,37 @@
+/**
+ * Structured server-side logger.
+ *
+ * Emits JSON lines to stderr so they appear in container/process logs without
+ * polluting stdout (which Node's HTTP layer uses for responses).
+ *
+ * Format mirrors Go's log/slog default JSON output:
+ *   {"time":"…","level":"ERROR","msg":"…","context":"pocketbase",...extra}
+ *
+ * Usage:
+ *   import { log } from '$lib/server/logger';
+ *   log.error('pocketbase', 'auth failed', { status: 401, url });
+ *   log.warn('minio', 'presign slow', { slug, n, ms: elapsed });
+ *   log.info('auth', 'user registered', { username });
+ */
+
+type Level = 'DEBUG' | 'INFO' | 'WARN' | 'ERROR';
+type Extra = Record<string, unknown>;
+
+function emit(level: Level, context: string, msg: string, extra?: Extra): void {
+	const entry: Record<string, unknown> = {
+		time: new Date().toISOString(),
+		level,
+		context,
+		msg,
+		...extra
+	};
+	// Write to stderr — never stdout
+	process.stderr.write(JSON.stringify(entry) + '\n');
+}
+
+export const log = {
+	debug: (context: string, msg: string, extra?: Extra) => emit('DEBUG', context, msg, extra),
+	info:  (context: string, msg: string, extra?: Extra) => emit('INFO',  context, msg, extra),
+	warn:  (context: string, msg: string, extra?: Extra) => emit('WARN',  context, msg, extra),
+	error: (context: string, msg: string, extra?: Extra) => emit('ERROR', context, msg, extra),
+};

v3/ui/src/lib/server/minio.ts

@@ -0,0 +1,184 @@
+/**
+ * Server-side MinIO presign helper.
+ * Calls the backend API to get presigned URLs, then optionally rewrites
+ * the MinIO host to the public-facing URL for browser use.
+ *
+ * Never import this from client-side code.
+ */
+
+import { env as pubEnv } from '$env/dynamic/public';
+import { log } from '$lib/server/logger';
+import { backendFetch } from '$lib/server/scraper';
+
+// Public MinIO URL — used to rewrite presigned URLs so the browser can reach MinIO directly.
+// In docker-compose this would differ from the internal endpoint.
+const MINIO_PUBLIC_URL = pubEnv.PUBLIC_MINIO_PUBLIC_URL ?? 'http://localhost:9000';
+
+// ─── Avatar helpers ───────────────────────────────────────────────────────────
+
+function extFromMime(mime: string): string {
+	if (mime.includes('png')) return 'png';
+	if (mime.includes('webp')) return 'webp';
+	if (mime.includes('gif')) return 'gif';
+	return 'jpg';
+}
+
+/**
+ * Returns a short-lived presigned PUT URL for uploading an avatar directly to MinIO,
+ * along with the object key to record in PocketBase after upload completes.
+ * Routed through the Go backend which holds MinIO credentials.
+ */
+export async function presignAvatarUploadUrl(userId: string, mimeType: string): Promise<{ uploadUrl: string; key: string }> {
+	const ext = extFromMime(mimeType);
+	const res = await backendFetch(`/api/presign/avatar-upload/${encodeURIComponent(userId)}?ext=${ext}`);
+	if (!res.ok) {
+		const body = await res.text().catch(() => '');
+		throw new Error(`presign avatar upload failed: ${res.status} ${body}`);
+	}
+	const data = (await res.json()) as { upload_url: string; key: string };
+	return { uploadUrl: data.upload_url, key: data.key };
+}
+
+/**
+ * Returns a presigned GET URL for a user's avatar, rewritten to the public URL.
+ * Returns null if no avatar exists.
+ */
+export async function presignAvatarUrl(userId: string): Promise<string | null> {
+	const res = await backendFetch(`/api/presign/avatar/${encodeURIComponent(userId)}`);
+	if (res.status === 404) return null;
+	if (!res.ok) {
+		const body = await res.text().catch(() => '');
+		throw new Error(`presign avatar failed: ${res.status} ${body}`);
+	}
+	const data = (await res.json()) as { url: string };
+	return data.url ?? null;
+}
+
+/**
+ * Rewrites the MinIO host in a presigned URL to the public-facing URL.
+ *
+ * The Go backend presigns URLs against its internal endpoint (e.g. minio:9000)
+ * when PUBLIC_MINIO_PUBLIC_URL is not set or equals the internal endpoint.
+ * In that case the browser must reach MinIO via the public URL (e.g.
+ * localhost:9000 in dev), so we swap the origin.
+ *
+ * NOTE: AWS Signature V4 DOES include the Host header in the canonical request
+ * (via X-Amz-SignedHeaders=host).  Rewriting the host here would break the
+ * signature.  This function is therefore only a no-op safety net — in
+ * production the Go backend is configured with MINIO_PUBLIC_ENDPOINT equal to
+ * the externally-reachable hostname, so presigned URLs already carry the right
+ * host and no rewrite is needed.
+ *
+ * For local dev: MINIO_PUBLIC_ENDPOINT=http://localhost:9000 and the backend
+ * presigns with localhost:9000 (the public client), so this rewrite is again
+ * a no-op (origins already match).
+ */
+function rewriteHost(presignedUrl: string): string {
+	try {
+		const u = new URL(presignedUrl);
+		const pub = new URL(MINIO_PUBLIC_URL);
+		// No-op if already pointing at the right origin.
+		if (u.protocol === pub.protocol && u.hostname === pub.hostname && u.port === pub.port) {
+			return presignedUrl;
+		}
+		u.protocol = pub.protocol;
+		u.hostname = pub.hostname;
+		u.port = pub.port;
+		return u.toString();
+	} catch {
+		return presignedUrl;
+	}
+}
+
+/**
+ * Returns a presigned URL for a chapter markdown file.
+ * URL is valid for ~15 minutes (set by the scraper).
+ *
+ * @param rewrite - if true, rewrites the MinIO host to PUBLIC_MINIO_PUBLIC_URL
+ *   (for browser use). Defaults to false — the server-side load function fetches
+ *   the URL directly from the internal MinIO endpoint.
+ */
+export async function presignChapter(slug: string, n: number, rewrite = false): Promise<string> {
+	log.debug('minio', 'presigning chapter', { slug, n });
+	let res: Response;
+	try {
+		res = await backendFetch(`/api/presign/chapter/${slug}/${n}`);
+	} catch (e) {
+		log.error('minio', 'presign chapter network error', { slug, n, err: String(e) });
+		throw new Error(`presign chapter ${slug}/${n}: network error`);
+	}
+	if (!res.ok) {
+		const body = await res.text().catch(() => '');
+		log.error('minio', 'presign chapter failed', { slug, n, status: res.status, body });
+		throw new Error(`presign chapter ${slug}/${n}: ${res.status}`);
+	}
+	const data = (await res.json()) as { url: string };
+	log.debug('minio', 'presign chapter ok', { slug, n });
+	return rewrite ? rewriteHost(data.url) : data.url;
+}
+
+/**
+ * Returns a presigned URL for a voice sample audio file.
+ * URL is valid for ~1 hour. The URL is returned to the browser for direct streaming.
+ * Throws with { status: 404 } when the sample has not been generated yet.
+ */
+export async function presignVoiceSample(voice: string): Promise<string> {
+	log.debug('minio', 'presigning voice sample', { voice });
+	let res: Response;
+	try {
+		res = await backendFetch(`/api/presign/voice-sample/${encodeURIComponent(voice)}`);
+	} catch (e) {
+		log.error('minio', 'presign voice sample network error', { voice, err: String(e) });
+		throw new Error(`presign voice sample ${voice}: network error`);
+	}
+	if (res.status === 404) {
+		const err = new Error(`presign voice sample ${voice}: not found`) as Error & { status: number };
+		err.status = 404;
+		throw err;
+	}
+	if (!res.ok) {
+		const body = await res.text().catch(() => '');
+		log.error('minio', 'presign voice sample failed', { voice, status: res.status, body });
+		throw new Error(`presign voice sample ${voice}: ${res.status}`);
+	}
+	const data = (await res.json()) as { url: string };
+	log.debug('minio', 'presign voice sample ok', { voice });
+	return rewriteHost(data.url);
+}
+
+/**
+ * Returns a presigned URL for an audio file.
+ * URL is valid for ~1 hour. The URL is returned to the browser for direct streaming.
+ * Throws with { status: 404 } when the audio object has not been generated yet.
+ */
+export async function presignAudio(
+	slug: string,
+	n: number,
+	voice?: string
+): Promise<string> {
+	const params = new URLSearchParams();
+	if (voice) params.set('voice', voice);
+	const qs = params.toString() ? `?${params.toString()}` : '';
+	log.debug('minio', 'presigning audio', { slug, n, voice });
+	let res: Response;
+	try {
+		res = await backendFetch(`/api/presign/audio/${slug}/${n}${qs}`);
+	} catch (e) {
+		log.error('minio', 'presign audio network error', { slug, n, err: String(e) });
+		throw new Error(`presign audio ${slug}/${n}: network error`);
+	}
+	if (res.status === 404) {
+		// Audio hasn't been generated / uploaded yet — caller should surface this as 404.
+		const err = new Error(`presign audio ${slug}/${n}: not found`) as Error & { status: number };
+		err.status = 404;
+		throw err;
+	}
+	if (!res.ok) {
+		const body = await res.text().catch(() => '');
+		log.error('minio', 'presign audio failed', { slug, n, status: res.status, body });
+		throw new Error(`presign audio ${slug}/${n}: ${res.status}`);
+	}
+	const data = (await res.json()) as { url: string };
+	log.debug('minio', 'presign audio ok', { slug, n });
+	return rewriteHost(data.url);
+}

v3/ui/src/lib/server/presignCache.ts

@@ -0,0 +1,118 @@
+/**
+ * Valkey-backed presign URL cache (v3).
+ *
+ * Replaces the in-process Map from v2. All presign URLs are stored in Valkey
+ * (Redis-compatible) with native TTL, so:
+ *   - Cache survives UI process restarts.
+ *   - Cache is shared across multiple UI replicas (if scaled horizontally).
+ *   - No manual sweep timer needed — Valkey expires entries automatically.
+ *
+ * MinIO presigned audio URLs are valid for 1 hour (set by the backend).
+ * We cache them for 50 minutes so the browser always gets a URL with at
+ * least 10 minutes of remaining validity.
+ *
+ * Voice-sample URLs use the same cache with key "sample:<voice>".
+ *
+ * Connection:
+ *   VALKEY_URL env var (default: redis://valkey:6379)
+ *   ioredis handles reconnection automatically.
+ */
+
+import Redis from 'ioredis';
+
+const AUDIO_TTL_S = 50 * 60; // 50 minutes in seconds (Valkey TTL is in seconds)
+
+// Lazily-initialised singleton client.
+let _client: Redis | null = null;
+
+function client(): Redis {
+	if (!_client) {
+		const url = process.env.VALKEY_URL ?? 'redis://valkey:6379';
+		_client = new Redis(url, {
+			// Reconnect automatically with exponential backoff (ioredis default).
+			// lazyConnect: false means the connection is established immediately.
+			lazyConnect: false,
+			// Log connection errors to stderr; do not crash the process.
+			enableOfflineQueue: true,
+			maxRetriesPerRequest: 2,
+		});
+		_client.on('error', (err: Error) => {
+			console.error('[presignCache] Valkey error:', err.message);
+		});
+	}
+	return _client;
+}
+
+// ── Key helpers ───────────────────────────────────────────────────────────────
+
+/** Cache key for a chapter audio presigned URL. */
+export function audioKey(slug: string, n: number, voice: string): string {
+	return `audio:${slug}:${n}:${voice}`;
+}
+
+/** Cache key for a voice-sample presigned URL. */
+export function sampleKey(voice: string): string {
+	return `sample:${voice}`;
+}
+
+// ── Public API ────────────────────────────────────────────────────────────────
+
+/** Return the cached URL for key, or null if absent / expired. */
+export async function get(key: string): Promise<string | null> {
+	try {
+		return await client().get(key);
+	} catch (err) {
+		console.error('[presignCache] get error:', err);
+		return null;
+	}
+}
+
+/** Store a presigned URL under key for ttlSeconds seconds. */
+export async function set(key: string, url: string, ttlSeconds = AUDIO_TTL_S): Promise<void> {
+	try {
+		await client().set(key, url, 'EX', ttlSeconds);
+	} catch (err) {
+		console.error('[presignCache] set error:', err);
+	}
+}
+
+/** Invalidate a specific key (e.g. after audio generation to force refresh). */
+export async function invalidate(key: string): Promise<void> {
+	try {
+		await client().del(key);
+	} catch (err) {
+		console.error('[presignCache] invalidate error:', err);
+	}
+}
+
+/**
+ * Disconnect from Valkey — called on graceful shutdown.
+ * ioredis queues commands during reconnects; calling quit() drains the queue
+ * and closes the connection cleanly.
+ */
+export async function drain(): Promise<void> {
+	if (_client) {
+		try {
+			await _client.quit();
+		} catch {
+			// ignore — process is exiting anyway
+		}
+		_client = null;
+	}
+}
+
+/**
+ * Returns the approximate number of keys matching the libnovel presign prefix.
+ * Used for health/debug only — not called in the hot path.
+ */
+export async function size(): Promise<number> {
+	try {
+		// DBSIZE returns the total key count in the current DB.
+		// For a precise count of just our keys, use SCAN with a pattern.
+		const keys = await client().keys('audio:*');
+		const sampleKeys = await client().keys('sample:*');
+		return keys.length + sampleKeys.length;
+	} catch {
+		return -1;
+	}
+}

v3/ui/src/lib/server/scraper.ts

@@ -0,0 +1,36 @@
+/**
+ * Backend API helper.
+ *
+ * Centralises the BACKEND_URL constant and provides a thin fetch wrapper that:
+ *   - Resolves paths relative to BACKEND_API_URL.
+ *   - Throws 502 on network errors (unreachable backend).
+ *   - Re-throws SvelteKit `error()` objects so callers can still short-circuit.
+ *   - Passes a RequestInit through verbatim so callers keep full control.
+ *
+ * Import only from server-side modules (`+server.ts`, `*.server.ts`).
+ */
+
+import { error } from '@sveltejs/kit';
+import { env } from '$env/dynamic/private';
+
+export const BACKEND_URL = env.BACKEND_API_URL ?? 'http://localhost:8080';
+
+/**
+ * Fetch a path on the backend, throwing a 502 on network failures.
+ *
+ * The `path` must start with `/` (e.g. `/api/voices`).
+ *
+ * SvelteKit `error()` exceptions are always re-thrown so callers can
+ * short-circuit correctly inside their own catch blocks.
+ */
+export async function backendFetch(path: string, init?: RequestInit): Promise<Response> {
+	try {
+		return await fetch(`${BACKEND_URL}${path}`, init);
+	} catch (e) {
+		// Re-throw SvelteKit HTTP errors so they propagate to the framework.
+		if (e instanceof Error && 'status' in e) throw e;
+		throw error(502, 'Could not reach backend');
+	}
+}
+
+

v3/ui/src/lib/types.ts

@@ -0,0 +1,63 @@
+/**
+ * Shared domain types for the LibNovel UI.
+ *
+ * Server-only types (full PocketBase record shapes) live in
+ * src/lib/server/pocketbase.ts. This file holds the types that are
+ * safe to import in both server and client code.
+ */
+
+// ── Auth / User ──────────────────────────────────────────────────────────────
+
+export interface AuthUser {
+	id: string;
+	username: string;
+	email: string;
+	role: 'admin' | 'user';
+	avatarUrl?: string;
+}
+
+// ── Books ────────────────────────────────────────────────────────────────────
+
+export interface BookSummary {
+	id: string;
+	slug: string;
+	title: string;
+	author: string;
+	coverUrl: string;
+	status: string;
+	/** Reading progress 0–100, if the user has any. */
+	progress?: number;
+}
+
+export interface ChapterRef {
+	number: number;
+	title: string;
+}
+
+// ── Comments ─────────────────────────────────────────────────────────────────
+
+export interface BookComment {
+	id: string;
+	slug: string;
+	user_id: string;
+	username: string;
+	body: string;
+	upvotes: number;
+	downvotes: number;
+	created: string;
+	parent_id?: string;
+	replies?: BookComment[];
+}
+
+// ── Audio ────────────────────────────────────────────────────────────────────
+
+export type AudioStatus = 'idle' | 'loading' | 'generating' | 'ready' | 'error';
+export type NextStatus = 'none' | 'prefetching' | 'prefetched' | 'failed';
+
+// ── User settings ─────────────────────────────────────────────────────────────
+
+export interface UserSettings {
+	voice: string;
+	speed: number;
+	autoNext: boolean;
+}