feat: 新增店铺联级查询接口

- 新增 GET /api/admin/shops/cascade 接口，支持按店铺名模糊查询和上级ID过滤
- Store 层新增 ListForCascade（支持数据权限过滤）和 GetParentIDsWithChildren 方法
- Service 层新增 ListCascade，批量判断 has_children 避免 N+1 查询
- 返回格式：[{id, shop_name, has_children}]

💘 Generated with Crush

Assisted-by: Claude Sonnet 4.6 via Crush <crush@charm.land>

docs/admin-openapi.yaml

@@ -6134,6 +6134,19 @@ components:
                 - card_no
                 - ssid
             type: object
+        DtoShopCascadeItem:
+            properties:
+                has_children:
+                    description: 是否有下级店铺
+                    type: boolean
+                id:
+                    description: 店铺ID
+                    minimum: 0
+                    type: integer
+                shop_name:
+                    description: 店铺名称
+                    type: string
+            type: object
         DtoShopCommissionRecordItem:
             properties:
                 amount:
@@ -20811,6 +20824,82 @@ paths:
             summary: 代理商提现记录
             tags:
                 - 代理商佣金管理
+    /api/admin/shops/cascade:
+        get:
+            parameters:
+                - description: 店铺名称（模糊查询）
+                  in: query
+                  name: shop_name
+                  schema:
+                    description: 店铺名称（模糊查询）
+                    maxLength: 100
+                    type: string
+                - description: 上级店铺ID（不传则查询顶级店铺）
+                  in: query
+                  name: parent_id
+                  schema:
+                    description: 上级店铺ID（不传则查询顶级店铺）
+                    minimum: 1
+                    nullable: true
+                    type: integer
+            responses:
+                "200":
+                    content:
+                        application/json:
+                            schema:
+                                properties:
+                                    code:
+                                        description: 响应码
+                                        example: 0
+                                        type: integer
+                                    data:
+                                        items:
+                                            $ref: '#/components/schemas/DtoShopCascadeItem'
+                                        type: array
+                                    msg:
+                                        description: 响应消息
+                                        example: success
+                                        type: string
+                                    timestamp:
+                                        description: 时间戳
+                                        format: date-time
+                                        type: string
+                                required:
+                                    - code
+                                    - msg
+                                    - data
+                                    - timestamp
+                                type: object
+                    description: 成功
+                "400":
+                    content:
+                        application/json:
+                            schema:
+                                $ref: '#/components/schemas/ErrorResponse'
+                    description: 请求参数错误
+                "401":
+                    content:
+                        application/json:
+                            schema:
+                                $ref: '#/components/schemas/ErrorResponse'
+                    description: 未认证或认证已过期
+                "403":
+                    content:
+                        application/json:
+                            schema:
+                                $ref: '#/components/schemas/ErrorResponse'
+                    description: 无权访问
+                "500":
+                    content:
+                        application/json:
+                            schema:
+                                $ref: '#/components/schemas/ErrorResponse'
+                    description: 服务器内部错误
+            security:
+                - BearerAuth: []
+            summary: 店铺联级查询
+            tags:
+                - 店铺管理
     /api/admin/shops/commission-summary:
         get:
             parameters: