优化

internal/data/storage/local.go

@@ -103,6 +103,9 @@ func composeFiles(ctx context.Context, storage biz.FileStorage, names []string,
 }
 
 func (s *fileStorage) resolve(name string) (string, error) {
+	if name == "" {
+		return "", fmt.Errorf("key不能为空")
+	}
 	clean := filepath.Clean(strings.TrimPrefix(name, "/"))
 	if clean == "." || filepath.IsAbs(clean) || clean == ".." || strings.HasPrefix(clean, ".."+string(filepath.Separator)) {
 		return "", fmt.Errorf("invalid storage path")
@@ -146,7 +149,12 @@ func (s *fileStorage) Delete(ctx context.Context, name string) error {
 	if err != nil {
 		return err
 	}
-	if err := os.Remove(path); err != nil && !os.IsNotExist(err) {
+	// Match the compatible Local.DeleteFile behavior: a missing object is an error and the
+	// media DB record is retained when the physical file cannot be removed.
+	if _, err := os.Stat(path); os.IsNotExist(err) {
+		return fmt.Errorf("文件不存在")
+	}
+	if err := os.Remove(path); err != nil {
 		return err
 	}
 	return nil
@@ -170,7 +178,7 @@ func (s *fileStorage) DeletePrefix(ctx context.Context, prefix string) error {
 	return nil
 }
 func (s *fileStorage) List(ctx context.Context, prefix, cursor string, limit int) ([]*biz.StoredFile, string, bool, error) {
-	if limit < 1 || limit > 1000 {
+	if limit <= 0 {
 		limit = 100
 	}
 	root, err := s.resolve(strings.TrimSuffix(prefix, "/") + "/placeholder")