feat: option A — visibility gating + author submission system

Content visibility:
- Add `visibility` field to books ("public" | "admin_only"); new migration
  backfills all existing scraped books to admin_only
- Meilisearch: add visibility as filterable attribute; catalogue/search
  endpoints filter to public-only for non-admin requests
- Admin users identified by bearer token bypass the filter and see all books
- All PocketBase discovery queries (trending, recommended, recently-updated,
  audio shelf, discover, subscription feed) now filter to visibility=public
- New scraped books default to admin_only; WriteMetadata preserves existing
  visibility on PATCH (never overwrites)

Author submission:
- POST /api/admin/books/submit — creates a public book with submitted_by
- PATCH /api/admin/books/{slug}/publish / unpublish — toggle visibility
- SvelteKit proxies: /api/admin/books/[slug]/publish|unpublish
- /api/books/[slug] endpoint for admin book lookup

Frontend:
- backendFetchAdmin() helper sends admin token on any path
- Catalogue server load uses admin fetch when user is admin
- /submit page: author submission form with genre picker and rights assertion
- "Publish" nav link shown to all logged-in users
- Admin catalogue-tools: visibility management panel (load book by slug, toggle)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/internal/backend/handlers.go

@@ -1869,13 +1869,19 @@ func (s *Server) handleCatalogue(w http.ResponseWriter, r *http.Request) {
 		limit = 100
 	}
 
+	// Admin users (identified by bearer token) see all non-archived books
+	// including those marked admin_only.
+	isAdmin := s.cfg.AdminToken != "" &&
+		r.Header.Get("Authorization") == "Bearer "+s.cfg.AdminToken
+
 	cq := meili.CatalogueQuery{
-		Q:      q.Get("q"),
-		Genre:  genre,
-		Status: status,
-		Sort:   sort,
-		Page:   page,
-		Limit:  limit,
+		Q:        q.Get("q"),
+		Genre:    genre,
+		Status:   status,
+		Sort:     sort,
+		Page:     page,
+		Limit:    limit,
+		AdminAll: isAdmin,
 	}
 
 	books, total, facets, err := s.deps.SearchIndex.Catalogue(r.Context(), cq)

backend/internal/backend/handlers_submit.go

@@ -0,0 +1,161 @@
+package backend
+
+import (
+	"encoding/json"
+	"errors"
+	"net/http"
+	"regexp"
+	"strings"
+	"unicode"
+
+	"github.com/libnovel/backend/internal/domain"
+	"github.com/libnovel/backend/internal/storage"
+)
+
+// handleAdminPublishBook handles PATCH /api/admin/books/{slug}/publish.
+// Sets visibility=public so the book is visible to all users.
+func (s *Server) handleAdminPublishBook(w http.ResponseWriter, r *http.Request) {
+	slug := r.PathValue("slug")
+	if slug == "" {
+		jsonError(w, http.StatusBadRequest, "missing slug")
+		return
+	}
+	if s.deps.BookAdminStore == nil {
+		jsonError(w, http.StatusServiceUnavailable, "book admin store not configured")
+		return
+	}
+	if err := s.deps.BookAdminStore.PublishBook(r.Context(), slug); err != nil {
+		if errors.Is(err, storage.ErrNotFound) {
+			jsonError(w, http.StatusNotFound, "book not found")
+			return
+		}
+		s.deps.Log.Error("publish book failed", "slug", slug, "err", err)
+		jsonError(w, http.StatusInternalServerError, err.Error())
+		return
+	}
+	// Sync the visibility change to Meilisearch immediately.
+	if meta, ok, err := s.deps.BookReader.ReadMetadata(r.Context(), slug); err == nil && ok {
+		if upsertErr := s.deps.SearchIndex.UpsertBook(r.Context(), meta); upsertErr != nil {
+			s.deps.Log.Warn("publish book: meili upsert failed", "slug", slug, "err", upsertErr)
+		}
+	}
+	s.deps.Log.Info("book published", "slug", slug)
+	writeJSON(w, http.StatusOK, map[string]string{"slug": slug, "visibility": domain.VisibilityPublic})
+}
+
+// handleAdminUnpublishBook handles PATCH /api/admin/books/{slug}/unpublish.
+// Sets visibility=admin_only, hiding the book from regular users.
+func (s *Server) handleAdminUnpublishBook(w http.ResponseWriter, r *http.Request) {
+	slug := r.PathValue("slug")
+	if slug == "" {
+		jsonError(w, http.StatusBadRequest, "missing slug")
+		return
+	}
+	if s.deps.BookAdminStore == nil {
+		jsonError(w, http.StatusServiceUnavailable, "book admin store not configured")
+		return
+	}
+	if err := s.deps.BookAdminStore.UnpublishBook(r.Context(), slug); err != nil {
+		if errors.Is(err, storage.ErrNotFound) {
+			jsonError(w, http.StatusNotFound, "book not found")
+			return
+		}
+		s.deps.Log.Error("unpublish book failed", "slug", slug, "err", err)
+		jsonError(w, http.StatusInternalServerError, err.Error())
+		return
+	}
+	// Sync to Meilisearch.
+	if meta, ok, err := s.deps.BookReader.ReadMetadata(r.Context(), slug); err == nil && ok {
+		if upsertErr := s.deps.SearchIndex.UpsertBook(r.Context(), meta); upsertErr != nil {
+			s.deps.Log.Warn("unpublish book: meili upsert failed", "slug", slug, "err", upsertErr)
+		}
+	}
+	s.deps.Log.Info("book unpublished", "slug", slug)
+	writeJSON(w, http.StatusOK, map[string]string{"slug": slug, "visibility": domain.VisibilityAdminOnly})
+}
+
+// handleAdminSubmitBook handles POST /api/admin/books/submit.
+// Creates a new author-submitted book with visibility=public.
+// The book starts with zero chapters; chapters are added via the import pipeline.
+func (s *Server) handleAdminSubmitBook(w http.ResponseWriter, r *http.Request) {
+	var req struct {
+		Title       string   `json:"title"`
+		Author      string   `json:"author"`
+		Cover       string   `json:"cover"`
+		Summary     string   `json:"summary"`
+		Genres      []string `json:"genres"`
+		Status      string   `json:"status"`
+		SubmittedBy string   `json:"submitted_by"` // app_users ID of submitting author
+	}
+	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+		jsonError(w, http.StatusBadRequest, "invalid request body")
+		return
+	}
+	req.Title = strings.TrimSpace(req.Title)
+	if req.Title == "" {
+		jsonError(w, http.StatusBadRequest, "title is required")
+		return
+	}
+	if req.Status == "" {
+		req.Status = "ongoing"
+	}
+
+	slug := slugifyTitle(req.Title)
+	if slug == "" {
+		jsonError(w, http.StatusBadRequest, "could not derive a slug from title")
+		return
+	}
+
+	if s.deps.BookAdminStore == nil {
+		jsonError(w, http.StatusServiceUnavailable, "book admin store not configured")
+		return
+	}
+
+	meta := domain.BookMeta{
+		Slug:        slug,
+		Title:       req.Title,
+		Author:      req.Author,
+		Cover:       req.Cover,
+		Summary:     req.Summary,
+		Genres:      req.Genres,
+		Status:      req.Status,
+		Visibility:  domain.VisibilityPublic,
+		SubmittedBy: req.SubmittedBy,
+	}
+	if err := s.deps.BookAdminStore.CreateSubmittedBook(r.Context(), meta); err != nil {
+		s.deps.Log.Error("submit book: create failed", "slug", slug, "err", err)
+		jsonError(w, http.StatusInternalServerError, "failed to create book")
+		return
+	}
+
+	// Index in Meilisearch immediately so it appears in search/catalogue.
+	if upsertErr := s.deps.SearchIndex.UpsertBook(r.Context(), meta); upsertErr != nil {
+		s.deps.Log.Warn("submit book: meili upsert failed", "slug", slug, "err", upsertErr)
+	}
+
+	s.deps.Log.Info("book submitted", "slug", slug, "title", req.Title, "by", req.SubmittedBy)
+	writeJSON(w, http.StatusCreated, map[string]string{"slug": slug})
+}
+
+// slugifyTitle converts a book title into a URL-safe slug.
+// e.g. "The Wandering Sword" → "the-wandering-sword"
+var nonAlnum = regexp.MustCompile(`[^a-z0-9]+`)
+
+func slugifyTitle(title string) string {
+	// Fold to lower-case ASCII, replace non-alphanum runs with hyphens.
+	var b strings.Builder
+	for _, r := range strings.ToLower(title) {
+		if r <= unicode.MaxASCII && (unicode.IsLetter(r) || unicode.IsDigit(r)) {
+			b.WriteRune(r)
+		} else {
+			b.WriteRune('-')
+		}
+	}
+	slug := nonAlnum.ReplaceAllString(b.String(), "-")
+	slug = strings.Trim(slug, "-")
+	if len(slug) > 80 {
+		slug = slug[:80]
+		slug = strings.TrimRight(slug, "-")
+	}
+	return slug
+}

backend/internal/backend/server.go

@@ -283,10 +283,15 @@ func (s *Server) ListenAndServe(ctx context.Context) error {
 	// Admin data repair endpoints
 	admin("POST /api/admin/dedup-chapters/{slug}", s.handleDedupChapters)
 
-	// Admin book management (soft-delete / hard-delete)
+	// Admin book management (soft-delete / hard-delete / publish visibility)
 	admin("PATCH /api/admin/books/{slug}/archive", s.handleAdminArchiveBook)
 	admin("PATCH /api/admin/books/{slug}/unarchive", s.handleAdminUnarchiveBook)
 	admin("DELETE /api/admin/books/{slug}", s.handleAdminDeleteBook)
+	admin("PATCH /api/admin/books/{slug}/publish", s.handleAdminPublishBook)
+	admin("PATCH /api/admin/books/{slug}/unpublish", s.handleAdminUnpublishBook)
+
+	// Author book submission (creates a public book with no scraped content)
+	admin("POST /api/admin/books/submit", s.handleAdminSubmitBook)
 
 	// Admin chapter split (imported books)
 	admin("POST /api/admin/books/{slug}/split-chapters", s.handleAdminSplitChapters)

backend/internal/bookstore/bookstore.go

@@ -235,6 +235,15 @@ type BookAdminStore interface {
 	//   - MinIO cover image (covers/{slug}.jpg)
 	// The caller is responsible for also deleting the Meilisearch document.
 	DeleteBook(ctx context.Context, slug string) error
+
+	// PublishBook sets visibility=public, making the book visible to all users.
+	PublishBook(ctx context.Context, slug string) error
+
+	// UnpublishBook sets visibility=admin_only, hiding the book from regular users.
+	UnpublishBook(ctx context.Context, slug string) error
+
+	// CreateSubmittedBook creates a new author-submitted book with visibility=public.
+	CreateSubmittedBook(ctx context.Context, meta domain.BookMeta) error
 }
 
 // ImportFileStore uploads raw import files to object storage.

backend/internal/domain/domain.go

@@ -7,6 +7,12 @@ import "time"
 
 // ── Book types ────────────────────────────────────────────────────────────────
 
+// Visibility values for BookMeta.Visibility.
+const (
+	VisibilityPublic    = "public"     // visible to all users
+	VisibilityAdminOnly = "admin_only" // visible only to admin users (e.g. scraped content)
+)
+
 // BookMeta carries all bibliographic information about a novel.
 type BookMeta struct {
 	Slug          string   `json:"slug"`
@@ -27,6 +33,12 @@ type BookMeta struct {
 	// Archived is true when the book has been soft-deleted by an admin.
 	// Archived books are excluded from all public search and catalogue responses.
 	Archived bool `json:"archived,omitempty"`
+	// Visibility controls who can see this book.
+	// "public" = all users; "admin_only" = admin only (default for scraped content).
+	Visibility string `json:"visibility,omitempty"`
+	// SubmittedBy is the app_users ID of the author who submitted this book,
+	// or empty for scraped books.
+	SubmittedBy string `json:"submitted_by,omitempty"`
 }
 
 // CatalogueEntry is a lightweight book reference returned by catalogue pages.

backend/internal/meili/client.go

@@ -52,6 +52,9 @@ type CatalogueQuery struct {
 	Sort   string // sort field: "popular", "new", "update", "top-rated", "rank", ""
 	Page   int    // 1-indexed
 	Limit  int    // items per page, default 20
+	// AdminAll disables the visibility filter so admin users see all non-archived
+	// books including those marked admin_only.
+	AdminAll bool
 }
 
 // FacetResult holds the available filter values discovered from the index.
@@ -103,7 +106,7 @@ func Configure(host, apiKey string) error {
 		return fmt.Errorf("meili: update searchable attributes: %w", err)
 	}
 
-	filterable := []interface{}{"status", "genres", "archived"}
+	filterable := []interface{}{"status", "genres", "archived", "visibility"}
 	if _, err := idx.UpdateFilterableAttributes(&filterable); err != nil {
 		return fmt.Errorf("meili: update filterable attributes: %w", err)
 	}
@@ -135,6 +138,9 @@ type bookDoc struct {
 	// Archived is true when the book has been soft-deleted by an admin.
 	// Used as a filter to exclude archived books from all search results.
 	Archived bool `json:"archived"`
+	// Visibility is "public" or "admin_only". Only public books are shown to
+	// non-admin users. Empty string is treated as admin_only for safety.
+	Visibility string `json:"visibility"`
 }
 
 func toDoc(b domain.BookMeta) bookDoc {
@@ -152,6 +158,7 @@ func toDoc(b domain.BookMeta) bookDoc {
 		Rating:        b.Rating,
 		MetaUpdated:   b.MetaUpdated,
 		Archived:      b.Archived,
+		Visibility:    b.Visibility,
 	}
 }
 
@@ -170,6 +177,7 @@ func fromDoc(d bookDoc) domain.BookMeta {
 		Rating:        d.Rating,
 		MetaUpdated:   d.MetaUpdated,
 		Archived:      d.Archived,
+		Visibility:    d.Visibility,
 	}
 }
 
@@ -210,7 +218,7 @@ func (c *MeiliClient) Search(_ context.Context, query string, limit int) ([]doma
 	}
 	res, err := c.idx.Search(query, &meilisearch.SearchRequest{
 		Limit:  int64(limit),
-		Filter: "archived = false",
+		Filter: `archived = false AND visibility = "public"`,
 	})
 	if err != nil {
 		return nil, fmt.Errorf("meili: search %q: %w", query, err)
@@ -251,8 +259,11 @@ func (c *MeiliClient) Catalogue(_ context.Context, q CatalogueQuery) ([]domain.B
 		Facets: []string{"genres", "status"},
 	}
 
-	// Build filter — always exclude archived books
+	// Build filter — always exclude archived books; restrict to public unless admin.
 	filters := []string{"archived = false"}
+	if !q.AdminAll {
+		filters = append(filters, `visibility = "public"`)
+	}
 	if q.Genre != "" && q.Genre != "all" {
 		filters = append(filters, fmt.Sprintf("genres = %q", q.Genre))
 	}

backend/internal/storage/store.go

@@ -63,7 +63,8 @@ var _ taskqueue.Reader = (*Store)(nil)
 // ── BookWriter ────────────────────────────────────────────────────────────────
 
 func (s *Store) WriteMetadata(ctx context.Context, meta domain.BookMeta) error {
-	payload := map[string]any{
+	// patchPayload does NOT include visibility or submitted_by — preserve existing values.
+	patchPayload := map[string]any{
 		"slug":           meta.Slug,
 		"title":          meta.Title,
 		"author":         meta.Author,
@@ -85,7 +86,13 @@ func (s *Store) WriteMetadata(ctx context.Context, meta domain.BookMeta) error {
 		return fmt.Errorf("WriteMetadata: %w", err)
 	}
 	if err == ErrNotFound {
-		postErr := s.pb.post(ctx, "/api/collections/books/records", payload, nil)
+		// New scraped book — default to admin_only visibility.
+		postPayload := make(map[string]any, len(patchPayload)+1)
+		for k, v := range patchPayload {
+			postPayload[k] = v
+		}
+		postPayload["visibility"] = domain.VisibilityAdminOnly
+		postErr := s.pb.post(ctx, "/api/collections/books/records", postPayload, nil)
 		if postErr == nil {
 			return nil
 		}
@@ -96,7 +103,28 @@ func (s *Store) WriteMetadata(ctx context.Context, meta domain.BookMeta) error {
 			return postErr // original POST error is more informative
 		}
 	}
-	return s.pb.patch(ctx, fmt.Sprintf("/api/collections/books/records/%s", existing.ID), payload)
+	return s.pb.patch(ctx, fmt.Sprintf("/api/collections/books/records/%s", existing.ID), patchPayload)
+}
+
+// CreateSubmittedBook creates a new author-submitted book with visibility=public.
+// Unlike WriteMetadata this always POSTs (no upsert) and sets the submitted_by field.
+func (s *Store) CreateSubmittedBook(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": 0,
+		"source_url":     "",
+		"ranking":        0,
+		"rating":         0,
+		"visibility":     domain.VisibilityPublic,
+		"submitted_by":   meta.SubmittedBy,
+	}
+	return s.pb.post(ctx, "/api/collections/books/records", payload, nil)
 }
 
 func (s *Store) WriteChapter(ctx context.Context, slug string, chapter domain.Chapter) error {
@@ -228,6 +256,8 @@ type pbBook struct {
 	Rating        float64  `json:"rating"`
 	Updated       string   `json:"updated"`
 	Archived      bool     `json:"archived"`
+	Visibility    string   `json:"visibility"`
+	SubmittedBy   string   `json:"submitted_by"`
 }
 
 func (b pbBook) toDomain() domain.BookMeta {
@@ -249,6 +279,8 @@ func (b pbBook) toDomain() domain.BookMeta {
 		Rating:        b.Rating,
 		MetaUpdated:   metaUpdated,
 		Archived:      b.Archived,
+		Visibility:    b.Visibility,
+		SubmittedBy:   b.SubmittedBy,
 	}
 }
 
@@ -407,6 +439,32 @@ func (s *Store) UnarchiveBook(ctx context.Context, slug string) error {
 		map[string]any{"archived": false})
 }
 
+// PublishBook sets visibility=public on the book record for slug.
+func (s *Store) PublishBook(ctx context.Context, slug string) error {
+	book, err := s.getBookBySlug(ctx, slug)
+	if err == ErrNotFound {
+		return ErrNotFound
+	}
+	if err != nil {
+		return fmt.Errorf("PublishBook: %w", err)
+	}
+	return s.pb.patch(ctx, fmt.Sprintf("/api/collections/books/records/%s", book.ID),
+		map[string]any{"visibility": domain.VisibilityPublic})
+}
+
+// UnpublishBook sets visibility=admin_only on the book record for slug.
+func (s *Store) UnpublishBook(ctx context.Context, slug string) error {
+	book, err := s.getBookBySlug(ctx, slug)
+	if err == ErrNotFound {
+		return ErrNotFound
+	}
+	if err != nil {
+		return fmt.Errorf("UnpublishBook: %w", err)
+	}
+	return s.pb.patch(ctx, fmt.Sprintf("/api/collections/books/records/%s", book.ID),
+		map[string]any{"visibility": domain.VisibilityAdminOnly})
+}
+
 // DeleteBook permanently removes all data for a book:
 //   - PocketBase books record
 //   - All PocketBase chapters_idx records for the slug