perf: P1 性能优化批量修复 + kefu 视图拆分

P1 性能优化（避免循环内 N+1 / N 次 DB 查询）：
- shop_order_views._batch_images: 移除 ThreadPoolExecutor 掩盖的 N 次查询，改单次批量 + Python 侧分组
- product_query.DashouHuiyuanList: 5N 查询 -> 3 次批量预取 + 本地闭包判断
- roles.GetRolePermissionView / 用户列表: 循环内 RolePermission/Permission/UserRole/Role -> 批量 __in 预取
- guanli / zuzhang 杜次分红 4.2/4.3: 循环内 update_or_create + 单条 delete -> bulk_create + bulk_update + 批量 delete
- admin_config QQ 群配置: 循环内 exists/first/save/create -> 批量预取 + bulk_create + bulk_update
- jituan 服务层多处合并统计查询、批量预取 map
- rank 多处循环 N+1 改批量预取
- backend 多处循环内 count/create 改批量
- config/orders/merchant_ops 多处循环 N+1 改批量预取

其他改动：
- users/views/kefu.py 拆分为 kefu_base/kefu_dashou/kefu_orders/kefu_punishment/kefu_withdraw 5 个文件
- 删除遗留脚本 check_prod_uid.py / create_rbac_tables.sql

orders/views/chat.py

@@ -193,13 +193,13 @@ def send_group_message(
 def check_user_permission(identity_type, uid, order):
     """验证用户身份、账号状态、以及是否属于该订单"""
     try:
-        user = User.query.get(UserUID=uid)
+        user = User.query.select_related('DashouProfile').get(UserUID=uid)
     except User.DoesNotExist:
         return False, '用户不存在'
 
     if identity_type == 'PlayerID':
         try:
-            dashou = UserDashou.query.get(user=user)
+            dashou = user.DashouProfile
             if dashou.zhanghaozhuangtai != 1 :
                 return False, '打手账号已被封禁或状态异常'
         except UserDashou.DoesNotExist:
@@ -516,14 +516,16 @@ class LianTongDingDanZhuangTaiPiLiangView(APIView):
             return Response({'code': 400, 'msg': 'order_ids 格式错误'})
 
         uid = request.user.UserUID
+        # 批量查询订单，避免循环内 N+1
+        oids = [str(oid).strip() for oid in order_ids[:20] if str(oid).strip()]
+        orders_map = {
+            o.OrderID: o
+            for o in Order.query.select_related('pingtai_kuozhan', 'shangjia_kuozhan').filter(OrderID__in=oids)
+        }
         result = {}
-        for oid in order_ids[:20]:
-            oid = str(oid).strip()
-            if not oid:
-                continue
-            try:
-                order = Order.query.select_related('pingtai_kuozhan', 'shangjia_kuozhan').get(OrderID=oid)
-            except Order.DoesNotExist:
+        for oid in oids:
+            order = orders_map.get(oid)
+            if not order:
                 continue
             for identity in ('PlayerID', 'shangjia', 'boss'):
                 valid, _ = check_user_permission(identity, uid, order)