feat(books): édition des métadonnées livres et séries + champ authors multi-valeurs

- Nouveaux endpoints PATCH /books/:id et PATCH /libraries/:id/series/:name pour éditer les métadonnées
- GET /libraries/:id/series/:name/metadata pour récupérer les métadonnées de série
- Ajout du champ `authors` (Vec<String>) sur les structs Book/BookDetails
- 3 migrations : table series_metadata, colonne authors sur series_metadata et books
- Composants EditBookForm et EditSeriesForm dans le backoffice
- Routes API Next.js correspondantes

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

apps/api/src/openapi.rs

@@ -15,6 +15,9 @@ use utoipa::OpenApi;
         crate::books::ongoing_series,
         crate::books::ongoing_books,
         crate::books::convert_book,
+        crate::books::update_book,
+        crate::books::get_series_metadata,
+        crate::books::update_series,
         crate::pages::get_page,
         crate::search::search_books,
         crate::index_jobs::enqueue_rebuild,
@@ -58,6 +61,10 @@ use utoipa::OpenApi;
             crate::books::SeriesPage,
             crate::books::ListAllSeriesQuery,
             crate::books::OngoingQuery,
+            crate::books::UpdateBookRequest,
+            crate::books::SeriesMetadata,
+            crate::books::UpdateSeriesRequest,
+            crate::books::UpdateSeriesResponse,
             crate::pages::PageQuery,
             crate::search::SearchQuery,
             crate::search::SearchResponse,