chore: migrate to v3, Doppler secrets, clean up legacy code

- Remove all pre-v3 code: scraper, ui-v2, backend v1, ios v1+v2, legacy CI workflows
- Flatten v3/ contents to repo root
- Add Doppler secrets management (project=libnovel, config=prd)
- Add justfile with doppler run wrappers for all docker compose commands
- Strip hardcoded env fallbacks from docker-compose.yml
- Add minimal README.md
- Clean up .gitignore

backend/cmd/backend/main.go

@@ -2,7 +2,7 @@
 //
 // 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.
+// progress, live novelfire.net 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.
@@ -19,10 +19,13 @@ import (
 	"os"
 	"os/signal"
 	"syscall"
+	"time"
 
+	"github.com/getsentry/sentry-go"
 	"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"
 )
 
@@ -42,6 +45,19 @@ func main() {
 func run() error {
 	cfg := config.Load()
 
+	// ── Sentry / GlitchTip error tracking ────────────────────────────────────
+	if dsn := os.Getenv("GLITCHTIP_DSN"); dsn != "" {
+		if err := sentry.Init(sentry.ClientOptions{
+			Dsn:              dsn,
+			Release:          version + "@" + commit,
+			TracesSampleRate: 0.1,
+		}); err != nil {
+			fmt.Fprintf(os.Stderr, "backend: sentry init warning: %v\n", err)
+		} else {
+			defer sentry.Flush(2 * time.Second)
+		}
+	}
+
 	// ── Logger ───────────────────────────────────────────────────────────────
 	log := buildLogger(cfg.LogLevel)
 	log.Info("backend starting",
@@ -70,6 +86,16 @@ func run() error {
 		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{
@@ -84,9 +110,10 @@ func run() error {
 			AudioStore:    store,
 			PresignStore:  store,
 			ProgressStore: store,
-			BrowseStore:   store,
+			CoverStore:    store,
 			Producer:      store,
 			TaskReader:    store,
+			SearchIndex:   searchIndex,
 			Kokoro:        kokoroClient,
 			Log:           log,
 		},