feat(security): library visibility enforced at the source; per-library series; annotation ownership; admin user creation

The family-lens hardening: library_visibility was only enforced where
file bytes flowed (download/reader/OPDS) — metadata surfaces leaked
hidden libraries to any authenticated account, and registration was
open by default with no admin-side user creation.

- Series are grouped PER LIBRARY now (same name in two libraries =
  two entries: manga adaptations / LN splits no longer merge);
  /api/series aggregates only the requester's VISIBLE libraries and
  /api/series/books REQUIRES a visible library_id (breaking contract;
  web + app clients updated in the same change).
- /api/media-items, item detail, and the reader content endpoints
  (chapters/panels/outline/THUMBNAILS — page images leaked unguarded
  next to a gated GetPage) all enforce the visible set; resolveLibrary
  no longer honors a hand-typed library_id outside the visible set.
- Annotation/note/bookmark mutations (update/delete/tombstone, sync
  LWW paths incl. conflict resolution) carry ownership predicates:
  another account's bare row id is a 404, not a silent delete.
- Admin user creation: POST /api/auth/users (AdminMiddleware) + a
  Create User card in the admin Users UI — accounts stay creatable
  with self-service registration OFF, which is now the schema default
  (fresh installs; the first-admin bootstrap exception is unchanged).
- Tests: series contract re-pinned (per-library, visibility 403s),
  new ownership + admin-create integration suites, OPDS all=1 test
  now passes an explicit page size (shared-DB growth made the fresh
  books fall off page 1), device-cap helper switched to the admin
  endpoint.

internal/database/querier.go

@@ -1,6 +1,6 @@
 // Code generated by sqlc. DO NOT EDIT.
 // versions:
-//   sqlc v1.31.1
+//   sqlc v1.31.0
 
 package database
 
@@ -131,12 +131,12 @@ type Querier interface {
 	DeleteKoboEntitlement(ctx context.Context, arg DeleteKoboEntitlementParams) error
 	DeleteLibrary(ctx context.Context, id pgtype.UUID) error
 	DeleteLibraryFolder(ctx context.Context, arg DeleteLibraryFolderParams) (LibraryFolders, error)
-	DeleteMediaBookmark(ctx context.Context, id pgtype.UUID) error
-	DeleteMediaHighlight(ctx context.Context, id pgtype.UUID) error
+	DeleteMediaBookmark(ctx context.Context, arg DeleteMediaBookmarkParams) error
+	DeleteMediaHighlight(ctx context.Context, arg DeleteMediaHighlightParams) error
 	DeleteMediaItem(ctx context.Context, id pgtype.UUID) error
 	// Delete media item format
 	DeleteMediaItemFormat(ctx context.Context, id pgtype.UUID) error
-	DeleteMediaNote(ctx context.Context, id pgtype.UUID) error
+	DeleteMediaNote(ctx context.Context, arg DeleteMediaNoteParams) error
 	DeleteMediaRating(ctx context.Context, arg DeleteMediaRatingParams) error
 	DeleteProcessingIssue(ctx context.Context, id pgtype.UUID) (ProcessingIssues, error)
 	DeleteReadingProgress(ctx context.Context, arg DeleteReadingProgressParams) error
@@ -205,8 +205,11 @@ type Querier interface {
 	// Get device shelf mappings
 	GetDeviceShelfMappings(ctx context.Context, deviceID pgtype.UUID) ([]GetDeviceShelfMappingsRow, error)
 	GetDictionaryEntry(ctx context.Context, word string) (DictionaryCache, error)
+	// Series are grouped PER LIBRARY: the same series name in two libraries
+	// (novels vs manga adaptations, LN splits) stays two entries. Visible
+	// filter enforces per-user library visibility at the source.
 	GetDistinctSeries(ctx context.Context, arg GetDistinctSeriesParams) ([]GetDistinctSeriesRow, error)
-	GetDistinctSeriesCount(ctx context.Context, libraryID pgtype.UUID) (int32, error)
+	GetDistinctSeriesCount(ctx context.Context, arg GetDistinctSeriesCountParams) (int32, error)
 	GetFailedSyncQueueItems(ctx context.Context, limit int32) ([]SyncQueue, error)
 	GetFirstAdmin(ctx context.Context) (pgtype.UUID, error)
 	GetFirstAdminExclude(ctx context.Context, id pgtype.UUID) (GetFirstAdminExcludeRow, error)
@@ -306,7 +309,10 @@ type Querier interface {
 	GetRefreshToken(ctx context.Context, token pgtype.UUID) (GetRefreshTokenRow, error)
 	GetSavedFilterByID(ctx context.Context, arg GetSavedFilterByIDParams) (SavedFilters, error)
 	GetSavedFilters(ctx context.Context, arg GetSavedFiltersParams) ([]SavedFilters, error)
-	GetSeriesBooks(ctx context.Context, series pgtype.Text) ([]MediaItems, error)
+	// Scoped to ONE library: same-name series in different libraries are
+	// different stories (manga adaptations, LN splits). Callers must pass a
+	// library_id and verify the requester can see that library.
+	GetSeriesBooks(ctx context.Context, arg GetSeriesBooksParams) ([]MediaItems, error)
 	GetSeriesCovers(ctx context.Context, arg GetSeriesCoversParams) ([]GetSeriesCoversRow, error)
 	GetStuckSyncQueueItems(ctx context.Context) ([]SyncQueue, error)
 	GetSyncConflict(ctx context.Context, id pgtype.UUID) (SyncConflicts, error)
@@ -460,11 +466,11 @@ type Querier interface {
 	SetSystemConfig(ctx context.Context, arg SetSystemConfigParams) (SystemConfig, error)
 	SyncLibraryTypeExtensions(ctx context.Context, arg SyncLibraryTypeExtensionsParams) error
 	TombstoneMediaBookmarkByDedupKey(ctx context.Context, arg TombstoneMediaBookmarkByDedupKeyParams) error
-	TombstoneMediaBookmarkByID(ctx context.Context, id pgtype.UUID) error
+	TombstoneMediaBookmarkByID(ctx context.Context, arg TombstoneMediaBookmarkByIDParams) error
 	TombstoneMediaHighlightByDedupKey(ctx context.Context, arg TombstoneMediaHighlightByDedupKeyParams) error
-	TombstoneMediaHighlightByID(ctx context.Context, id pgtype.UUID) error
+	TombstoneMediaHighlightByID(ctx context.Context, arg TombstoneMediaHighlightByIDParams) error
 	TombstoneMediaNoteByDedupKey(ctx context.Context, arg TombstoneMediaNoteByDedupKeyParams) error
-	TombstoneMediaNoteByID(ctx context.Context, id pgtype.UUID) error
+	TombstoneMediaNoteByID(ctx context.Context, arg TombstoneMediaNoteByIDParams) error
 	TombstoneSystemCollection(ctx context.Context, id pgtype.UUID) error
 	// Update collection
 	UpdateCollection(ctx context.Context, arg UpdateCollectionParams) (Collections, error)