refactor(router): Phase 5 - update router package with new handlers

- Update Config struct to replace EbookHandler with MediaHandler, SearchHandler, MatchingHandler
- Add CollectionHandler to Config struct
- Update RegisterRoutes to call new registration functions
- Create registerCollectionsRoutes for 15 collection endpoints
- Create registerSearchRoutes for search endpoints (uses MediaHandler.SearchMediaItems, MatchingHandler.QueryBooks)
- Create registerMatchingRoutes for 8 matching/linking endpoints
- Update registerMediaRoutes to use cfg.MediaHandler (adds 24 media endpoints)
- Create registerProgressRoutes for 3 universal progress endpoints

All 57 routes preserved and properly registered with correct handlers.
No functionality lost, all endpoints work identically.

This is Phase 5 of the ebook.go refactoring plan.

internal/router/search.go

@@ -0,0 +1,13 @@
+package router
+
+func registerSearchRoutes(cfg *Config) {
+	e := cfg.Echo
+
+	// JWT middleware for protected routes
+	jwtMiddleware := createJWTMiddleware(cfg)
+	protected := e.Group("/api", jwtMiddleware)
+
+	// Search and query endpoints (all authenticated users)
+	protected.GET("/media-items/search", cfg.MediaHandler.SearchMediaItems)
+	protected.POST("/sync/books/query", cfg.MatchingHandler.QueryBooks)
+}