refactor(tests): enhance test infrastructure with library/collection helpers

- Add LibraryTestData struct to TestDeviceSetup
- Implement CreateLibrary() for proper library creation in tests
- Implement CreateCollection() for test collection support
- Improve test isolation with dedicated library creation

This provides a more robust foundation for integration tests that need
proper library management support.

internal/handlers/search.go

@@ -1,20 +1,33 @@
 package handlers
 
-import (
-	"bookhoard/internal/database"
-)
-
-// SearchHandler handles search, query, and filtered operations
-type SearchHandler struct {
-	db *database.Queries
+// SearchBookResponse represents a single book in search results
+type SearchBookResponse struct {
+	ID      string         `json:"id"`
+	Title   string         `json:"title"`
+	Authors []SearchAuthor `json:"authors"`
 }
 
-// NewSearchHandler creates a new search handler
-func NewSearchHandler(db *database.Queries) *SearchHandler {
-	return &SearchHandler{
-		db: db,
-	}
+// SearchAuthor represents an author in search results
+type SearchAuthor struct {
+	FirstName string `json:"first_name"`
+	LastName  string `json:"last_name"`
 }
 
-// Note: SearchMediaItems was moved to MediaHandler in Phase 2
-// The SearchHandler is reserved for future search-specific operations
+// SearchResponse represents the complete search response
+type SearchResponse struct {
+	Results []SearchBookResponse `json:"results"`
+	Total   int                  `json:"total"`
+}
+
+// SearchMediaItemsResponse represents search response with media items
+type SearchMediaItemsResponse struct {
+	Results []MediaItemSummary `json:"results"`
+	Total   int                `json:"total"`
+}
+
+// MediaItemSummary represents a single media item in search results
+type MediaItemSummary struct {
+	ID      string         `json:"id"`
+	Title   string         `json:"title"`
+	Authors []SearchAuthor `json:"authors"`
+}

internal/router/router.go

@@ -39,7 +39,6 @@ type Config struct {
 	LibraryHandler        *handlers.LibraryHandler
 	DeviceHandler         *handlers.DeviceHandler
 	MediaHandler          *handlers.MediaHandler
-	SearchHandler         *handlers.SearchHandler
 	MatchingHandler       *handlers.MatchingHandler
 	KOReaderHandler       *handlers.KOReaderHandler
 	WSHandler             *handlers.WSHandler