新增排查自己的逻辑

internal/store/postgres/shop_store.go

@@ -229,25 +229,32 @@ func (s *ShopStore) GetByIDs(ctx context.Context, ids []uint) ([]*model.Shop, er
 	return shops, nil
 }
 
-// ListForCascade 联级查询店铺（支持按名称模糊查询和按上级ID过滤）
-func (s *ShopStore) ListForCascade(ctx context.Context, shopName string, parentID *uint) ([]*model.Shop, error) {
+// ListForCascade 联级查询店铺（支持按名称模糊查询、按上级ID过滤和排除自身）
+func (s *ShopStore) ListForCascade(ctx context.Context, shopName string, parentID *uint, excludeSelf bool) ([]*model.Shop, error) {
 	query := s.db.WithContext(ctx).Model(&model.Shop{})
 	query = middleware.ApplyShopIDFilter(ctx, query)
+	currentShopID := middleware.GetShopIDFromContext(ctx)
 
 	if parentID != nil {
 		query = query.Where("parent_id = ?", *parentID)
 	} else if middleware.GetUserTypeFromContext(ctx) == constants.UserTypeAgent {
-		shopID := middleware.GetShopIDFromContext(ctx)
-		if shopID == 0 {
+		if currentShopID == 0 {
 			query = query.Where("1 = 0")
+		} else if excludeSelf {
+			// 排除自身时，代理账号的级联根节点从自身下级开始。
+			query = query.Where("parent_id = ?", currentShopID)
 		} else {
 			// 代理账号的级联根节点是自己的店铺，避免默认根查询落到平台顶级店铺。
-			query = query.Where("id = ?", shopID)
+			query = query.Where("id = ?", currentShopID)
 		}
 	} else {
 		query = query.Where("parent_id IS NULL")
 	}
 
+	if excludeSelf && currentShopID > 0 {
+		query = query.Where("id <> ?", currentShopID)
+	}
+
 	if shopName != "" {
 		query = query.Where("shop_name LIKE ?", "%"+shopName+"%")
 	}