倍率问题和图片问题调整

backend/internal/assets/assets.go

@@ -245,6 +245,7 @@ func (s *Service) Upload(ctx context.Context, scope Scope, cmd UploadCommand) (A
 	if s.blobs == nil {
 		return Asset{}, errors.New("blob store is unavailable")
 	}
+	cmd.FileName, cmd.ContentType = normalizeImageFile(cmd.FileName, cmd.ContentType, cmd.Bytes)
 	name := sanitizeFileName(cmd.FileName)
 	key := path.Join("uploads", s.now().UTC().Format("2006-01-02"), s.id("file")+"-"+name)
 	stored, err := s.blobs.Put(ctx, key, bytes.NewReader(cmd.Bytes), int64(len(cmd.Bytes)), cmd.ContentType)
@@ -296,6 +297,7 @@ func (s *Service) ImportGenerated(ctx context.Context, scope Scope, cmd ImportGe
 	if strings.TrimSpace(name) == "" {
 		name = path.Base(strings.SplitN(cmd.URL, "?", 2)[0])
 	}
+	name, blob.ContentType = normalizeImageFile(name, blob.ContentType, content)
 	if s.blobs == nil {
 		return Asset{}, errors.New("blob store is unavailable")
 	}