feat: add multi-provider support (Komga + Stripstream Librarian)

- Introduce provider abstraction layer (IMediaProvider, KomgaProvider, StripstreamProvider)
- Add Stripstream Librarian as second media provider with full feature parity
- Migrate all pages and components from direct Komga services to provider factory
- Remove dead service code (BaseApiService, HomeService, LibraryService, SearchService, TestService)
- Fix library/series page-based pagination for both providers (Komga 0-indexed, Stripstream 1-indexed)
- Fix unread filter and search on library page for both providers
- Fix read progress display for Stripstream (reading_status mapping)
- Fix series read status (books_read_count) for Stripstream
- Add global search with series results for Stripstream (series_hits from Meilisearch)
- Fix thumbnail proxy to return 404 gracefully instead of JSON on upstream error
- Replace duration-based cache debug detection with x-nextjs-cache header

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

src/app/actions/library.ts

@@ -1,20 +1,18 @@
 "use server";
 
 import { revalidatePath } from "next/cache";
-import { LibraryService } from "@/lib/services/library.service";
-import { BookService } from "@/lib/services/book.service";
+import { getProvider } from "@/lib/providers/provider.factory";
 import { AppError } from "@/utils/errors";
 
-/**
- * Lance un scan de bibliothèque
- */
 export async function scanLibrary(
   libraryId: string
 ): Promise<{ success: boolean; message: string }> {
   try {
-    await LibraryService.scanLibrary(libraryId, false);
+    const provider = await getProvider();
+    if (!provider) return { success: false, message: "Provider non configuré" };
+
+    await provider.scanLibrary(libraryId);
 
-    // Invalider le cache de la bibliothèque
     revalidatePath(`/libraries/${libraryId}`);
     revalidatePath("/libraries");
 
@@ -27,9 +25,6 @@ export async function scanLibrary(
   }
 }
 
-/**
- * Retourne un livre aléatoire depuis les bibliothèques sélectionnées
- */
 export async function getRandomBookFromLibraries(
   libraryIds: string[]
 ): Promise<{ success: boolean; bookId?: string; message?: string }> {
@@ -38,13 +33,15 @@ export async function getRandomBookFromLibraries(
       return { success: false, message: "Au moins une bibliothèque doit être sélectionnée" };
     }
 
-    const bookId = await BookService.getRandomBookFromLibraries(libraryIds);
-    return { success: true, bookId };
+    const provider = await getProvider();
+    if (!provider) return { success: false, message: "Provider non configuré" };
+
+    const bookId = await provider.getRandomBook(libraryIds);
+    return { success: true, bookId: bookId ?? undefined };
   } catch (error) {
     if (error instanceof AppError) {
       return { success: false, message: error.message };
     }
-
     return { success: false, message: "Erreur lors de la récupération d'un livre aléatoire" };
   }
 }