feat: table series avec UUID PK — migration complète backend + frontend

Migration DB (0070 + 0071):
- Backup automatique de book_reading_progress avant migration
- Crée table series (fusion de series_metadata) avec UUID PK
- Ajoute series_id FK à books, external_metadata_links, anilist_series_links,
  available_downloads, download_detection_results
- Supprime les colonnes TEXT legacy et la table series_metadata

Backend API + Indexer:
- Toutes les queries SQL migrées vers series_id FK + JOIN series
- Routes /series/:name → /series/:series_id (UUID)
- Nouvel endpoint GET /series/by-name/:name pour lookup par nom
- match_title_volumes() factorisé entre prowlarr.rs et download_detection.rs
- Fix scheduler.rs: settings → app_settings
- OpenAPI mis à jour avec les nouveaux endpoints

Frontend:
- Routes /libraries/[id]/series/[name] → /series/[seriesId]
- Tous les composants (Edit, Delete, MarkRead, Prowlarr, Metadata,
  ReadingStatus) utilisent seriesId
- compressVolumes() pour afficher T1→3 au lieu de T1 T2 T3
- Titre release en entier (plus de truncate) dans available downloads

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

apps/backoffice/app/(app)/books/[id]/page.tsx

@@ -76,10 +76,10 @@ export default async function BookDetailPage({
             <span className="text-muted-foreground">/</span>
           </>
         )}
-        {book.series && (
+        {book.series && book.series_id && (
           <>
             <Link
-              href={`/libraries/${book.library_id}/series/${encodeURIComponent(book.series)}`}
+              href={`/libraries/${book.library_id}/series/${book.series_id}`}
               className="text-muted-foreground hover:text-primary transition-colors"
             >
               {book.series}
@@ -116,9 +116,9 @@ export default async function BookDetailPage({
             {book.author && (
               <p className="text-base text-muted-foreground">{book.author}</p>
             )}
-            {book.series && (
+            {book.series && book.series_id && (
               <Link
-                href={`/libraries/${book.library_id}/series/${encodeURIComponent(book.series)}`}
+                href={`/libraries/${book.library_id}/series/${book.series_id}`}
                 className="inline-flex items-center gap-1 px-2 py-0.5 rounded-full bg-primary/10 text-primary text-xs border border-primary/30 font-medium"
               >
                 {book.series}

apps/backoffice/app/(app)/books/page.tsx

@@ -134,8 +134,8 @@ export default async function BooksPage({
           <div className="grid grid-cols-2 sm:grid-cols-3 md:grid-cols-4 lg:grid-cols-6 gap-4">
             {seriesHits.map((s) => (
               <Link
-                key={`${s.library_id}-${s.name}`}
-                href={`/libraries/${s.library_id}/series/${encodeURIComponent(s.name)}`}
+                key={`${s.library_id}-${s.series_id}`}
+                href={`/libraries/${s.library_id}/series/${s.series_id}`}
                 className="group"
               >
                 <div className="bg-card rounded-xl shadow-sm border border-border/60 overflow-hidden hover:shadow-md transition-shadow duration-200">