fix: 完成商务迁移复核与接口优化并清理历史资料

internal/data/system/media.go

@@ -125,6 +125,9 @@ func (r *mediaRepo) UpdateMediaName(ctx context.Context, id uint, name string) e
 	// not-found error instead of silently succeeding with RowsAffected=0.
 	var po mediaPO
 	if err := r.data.DB().WithContext(ctx).Where("id = ?", id).First(&po).Error; err != nil {
+		if errors.Is(err, gorm.ErrRecordNotFound) {
+			return system.ErrMediaNotFound
+		}
 		return err
 	}
 	return r.data.DB().WithContext(ctx).Model(&po).Update("name", name).Error
@@ -147,7 +150,7 @@ func (r *mediaRepo) CreateMediaBatch(ctx context.Context, items []*system.MediaF
 func (r *mediaRepo) SaveCategory(ctx context.Context, v *system.AttachmentCategory) error {
 	db := r.data.DB().WithContext(ctx)
 	var count int64
-	query := db.Model(&categoryPO{}).Where("name = ? AND pid = ?", v.Name, v.ParentID)
+	query := db.Model(&categoryPO{}).Where("name = ? AND pid = ? AND id <> ?", v.Name, v.ParentID, v.ID)
 	if err := query.Count(&count).Error; err != nil {
 		return err
 	}