refactor: remove caching-related API endpoints and configurations, update preferences structure, and clean up unused services

src/app/api/komga/libraries/[libraryId]/series/route.ts

@@ -53,40 +53,3 @@ export async function GET(
     );
   }
 }
-
-export async function DELETE(
-  request: NextRequest,
-  { params }: { params: Promise<{ libraryId: string }> }
-) {
-  try {
-    const libraryId: string = (await params).libraryId;
-
-    await LibraryService.invalidateLibrarySeriesCache(libraryId);
-
-    return NextResponse.json({ success: true });
-  } catch (error) {
-    logger.error({ err: error }, "API Library Cache Invalidation - Erreur:");
-    if (error instanceof AppError) {
-      return NextResponse.json(
-        {
-          error: {
-            code: error.code,
-            name: "Cache invalidation error",
-            message: getErrorMessage(error.code),
-          },
-        },
-        { status: 500 }
-      );
-    }
-    return NextResponse.json(
-      {
-        error: {
-          code: ERROR_CODES.CACHE.DELETE_ERROR,
-          name: "Cache invalidation error",
-          message: getErrorMessage(ERROR_CODES.CACHE.DELETE_ERROR),
-        },
-      },
-      { status: 500 }
-    );
-  }
-}