refactor(handlers): rename ebook.go to scanner.go

- Rename file: ebook.go -> scanner.go
- Update scanner field type to *services.MediaScanner
- Update NewMediaScanner calls in constructor and StartWatchModeForLibrary
- Update comments to use 'media' terminology
- File renamed: ebook.go -> scanner.go

internal/handlers/scanner.go

@@ -21,7 +21,7 @@ const (
 
 type Handler struct {
 	db                *database.Queries
-	scanner           *services.EbookScanner
+	scanner           *services.MediaScanner
 	worker            *services.Worker
 	scheduler         *services.Scheduler
 	ctx               context.Context
@@ -42,7 +42,7 @@ func NewHandler(db *database.Queries, connManager *wsync.ConnectionManager) *Han
 
 	return &Handler{
 		db:                db,
-		scanner:           services.NewEbookScanner(db),
+		scanner:           services.NewMediaScanner(db),
 		worker:            worker,
 		scheduler:         scheduler,
 		ctx:               ctx,
@@ -177,7 +177,7 @@ func (h *Handler) StartScanner(c echo.Context) error {
 		return c.JSON(http.StatusBadRequest, map[string]string{"error": "invalid folder paths: " + err.Error()})
 	}
 
-	// Set the admin ID for ebook association
+	// Set the admin ID for media item association
 	h.scanner.SetAdminID(pgtype.UUID{Bytes: userUUID, Valid: true})
 
 	// Start watching for changes
@@ -239,7 +239,7 @@ func (h *Handler) StartWatchModeForLibrary(ctx context.Context, libraryID pgtype
 		folderPaths[i] = folder.FolderPath
 	}
 
-	scanner := services.NewEbookScanner(h.db)
+	scanner := services.NewMediaScanner(h.db)
 	if err := scanner.SetFolders(folderPaths); err != nil {
 		return fmt.Errorf("failed to set scanner folders: %v", err)
 	}