feat(explore): allow deleting source categories

backend/internal/logic/dataset/service.go

@@ -20,7 +20,6 @@ var (
 	ErrURLInvalid     = errors.New("dataset source url is invalid")
 	ErrTitleRequired  = errors.New("dataset item title is required")
 	ErrStatusInvalid  = errors.New("dataset item status is invalid")
-	ErrBuiltInSource  = errors.New("built-in dataset source cannot be deleted")
 	ErrSyncInProgress = errors.New("dataset sync is already in progress")
 )
 
@@ -226,9 +225,6 @@ func (s *Service) DeleteSource(userID uint, identity string) error {
 		if err := tx.Where("identity = ? AND owner_id = ?", identity, userID).First(&source).Error; err != nil {
 			return err
 		}
-		if source.SeedKey != nil {
-			return ErrBuiltInSource
-		}
 		if err := tx.Where("source_id = ?", source.ID).Delete(&models.SaDatasetItem{}).Error; err != nil {
 			return err
 		}