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/main.rs

@@ -84,7 +84,9 @@ async fn main() -> anyhow::Result<()> {
         .route("/libraries/:id", delete(libraries::delete_library))
         .route("/libraries/:id/scan", axum::routing::post(libraries::scan_library))
         .route("/libraries/:id/monitoring", axum::routing::patch(libraries::update_monitoring))
+        .route("/books/:id", axum::routing::patch(books::update_book))
         .route("/books/:id/convert", axum::routing::post(books::convert_book))
+        .route("/libraries/:library_id/series/:name", axum::routing::patch(books::update_series))
         .route("/index/rebuild", axum::routing::post(index_jobs::enqueue_rebuild))
         .route("/index/thumbnails/rebuild", axum::routing::post(thumbnails::start_thumbnails_rebuild))
         .route("/index/thumbnails/regenerate", axum::routing::post(thumbnails::start_thumbnails_regenerate))
@@ -112,6 +114,7 @@ async fn main() -> anyhow::Result<()> {
         .route("/books/:id/pages/:n", get(pages::get_page))
         .route("/books/:id/progress", get(reading_progress::get_reading_progress).patch(reading_progress::update_reading_progress))
         .route("/libraries/:library_id/series", get(books::list_series))
+        .route("/libraries/:library_id/series/:name/metadata", get(books::get_series_metadata))
         .route("/series", get(books::list_all_series))
         .route("/series/ongoing", get(books::ongoing_series))
         .route("/series/mark-read", axum::routing::post(reading_progress::mark_series_read))