refactor: shorten model and table prefixes

backend/internal/logic/files/service.go

@@ -193,7 +193,7 @@ func randomStorageKey() (string, error) {
 }
 
 // CreateSource 只持久化 Save 产生的相对路径，不接受 handler 自行拼接本地路径。
-func (s *Service) CreateSource(ownerID uint, project *models.SenlinAgentProject, title string, stored StoredFile) (*models.SenlinAgentSource, error) {
+func (s *Service) CreateSource(ownerID uint, project *models.SaProject, title string, stored StoredFile) (*models.SaSource, error) {
 	title = strings.TrimSpace(title)
 	if title == "" {
 		title = stored.OriginalName
@@ -205,7 +205,7 @@ func (s *Service) CreateSource(ownerID uint, project *models.SenlinAgentProject,
 	if relativePath == "" || filepath.IsAbs(relativePath) {
 		return nil, ErrSourcePathRequired
 	}
-	source := &models.SenlinAgentSource{
+	source := &models.SaSource{
 		ProjectID: project.ID, ProjectIdentity: project.Identity, CreatedBy: ownerID,
 		Kind: "file", Title: title, FilePath: relativePath,
 	}