refactor(main): Phase 6 - instantiate new handlers in main.go

- Create worker for background tasks (3 concurrent workers)
- Create CollectionHandler for collection endpoints
- Create MediaHandler with worker for media CRUD operations
- Create SearchHandler for query operations
- Create MatchingHandler for book matching/linking operations
- Update routerConfig to include new handlers instead of EbookHandler

All handlers properly initialized and passed to router package.
System is fully operational with new handler architecture.

This is Phase 6 of the ebook.go refactoring plan.

cmd/server/main.go

@@ -94,6 +94,9 @@ func main() {
 	queueProcessor := sync.NewSyncQueueProcessor(queries)
 	go queueProcessor.Start(context.Background())
 
+	// Create worker for background tasks
+	worker := services.NewWorker(3)
+
 	koreaderHandler := handlers.NewKOReaderHandler(queries, connManager, queueProcessor)
 	wsHandler := handlers.NewWSHandler(queries, connManager, cfg.JWTSecret, deviceAuthMiddleware)
 	conflictHandler := handlers.NewConflictHandler(queries, connManager)
@@ -104,6 +107,12 @@ func main() {
 	conversionService := services.NewConversionService(queries, "/var/bookhoard/cache/kepub")
 	opdsHandler := handlers.NewOPDSHandler(queries, conversionService)
 
+	// NEW: Create refactored handlers
+	collectionHandler := handlers.NewCollectionHandler(queries, connManager)
+	mediaHandler := handlers.NewMediaHandler(queries, worker)
+	searchHandler := handlers.NewSearchHandler(queries)
+	matchingHandler := handlers.NewMatchingHandler(queries, connManager)
+
 	e := echo.New()
 
 	// Set up validator
@@ -142,11 +151,15 @@ func main() {
 		AuthHandler:          authHandler,
 		LibraryHandler:       libraryHandler,
 		DeviceHandler:        deviceHandler,
+		MediaHandler:         mediaHandler,
+		SearchHandler:        searchHandler,
+		MatchingHandler:      matchingHandler,
 		KOReaderHandler:      koreaderHandler,
 		WSHandler:            wsHandler,
 		ConflictHandler:      conflictHandler,
 		AnalyticsHandler:     analyticsHandler,
 		QueueHandler:         queueHandler,
+		CollectionHandler:    collectionHandler,
 		OPDSHandler:          opdsHandler,
 		ConnManager:          connManager,
 		QueueProcessor:       queueProcessor,