Add watched series/authors feature

Introduce watched lists for series and authors end-to-end.

- Add DB migration to create watched_series and watched_authors tables with indexes and foreign keys.
- Implement API routes: GET/POST for listing/adding and DELETE by id for both /api/user/watched-series and /api/user/watched-authors. Validation, ownership checks, and immediate targeted job triggers are included.
- Add client hooks (useWatchedSeries, useWatchedAuthors) with add/delete helpers and SWR revalidation.
- Add UI components: WatchButton (toggle/confirm) and WatchedListsSection for profile display and removal UX.
- Add processor (check-watched-lists.processor) and service (watched-lists.service) to scrape Audible, deduplicate, check library ownership, and auto-create requests; supports targeted checks for newly watched items.
- Include tests for the watched-lists service.

These changes implement the watched-lists feature to let users watch series/authors and have the system automatically detect and request new releases.

src/lib/utils/deduplicate-audiobooks.ts

@@ -44,9 +44,11 @@ export function normalizeTitle(title: string): string {
   return t.replace(/\s+/g, ' ').trim();
 }
 
-/** Normalize narrator for comparison. */
+/** Normalize narrator for comparison. Sorts individual names so order doesn't matter. */
 function normalizeNarrator(narrator?: string): string {
-  return (narrator || '').toLowerCase().trim();
+  const raw = (narrator || '').toLowerCase().trim();
+  if (!raw) return raw;
+  return raw.split(',').map(n => n.trim()).filter(Boolean).sort().join(', ');
 }
 
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