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/payment.py

@@ -204,7 +204,9 @@ class WechatPayNotifyView(APIView):
 
         # 锁定订单防止并发
         try:
-            dingdan = Order.query.select_for_update().filter(OrderID=out_trade_no).first()
+            dingdan = Order.query.select_for_update().select_related(
+                'pingtai_kuozhan', 'shangjia_kuozhan'
+            ).filter(OrderID=out_trade_no).first()
         except Exception as e:
             logger.error(f"查询订单异常: {e}")
             raise
@@ -263,7 +265,7 @@ class WechatPayNotifyView(APIView):
             if hasattr(dingdan, 'pingtai_kuozhan'):
                 laoban_id = dingdan.pingtai_kuozhan.BossID
             if laoban_id:
-                user_main = User.query.filter(UserUID=laoban_id).first()
+                user_main = User.query.filter(UserUID=laoban_id).select_related('BossProfile').first()
                 if user_main and hasattr(user_main, 'BossProfile'):
                     boss = user_main.BossProfile
                     boss.zonge = (boss.zonge or 0) + (dingdan.Amount or 0)
@@ -537,7 +539,7 @@ class PaymentVerifyView(APIView):
             # 更新老板扩展表
             laoban_id = dingdan.pingtai_kuozhan.BossID if hasattr(dingdan, 'pingtai_kuozhan') else None
             if laoban_id:
-                user_main = User.query.filter(UserUID=laoban_id).first()
+                user_main = User.query.filter(UserUID=laoban_id).select_related('BossProfile').first()
                 if user_main and hasattr(user_main, 'BossProfile'):
                     boss = user_main.BossProfile
                     boss.zonge = (boss.zonge or 0) + (dingdan.Amount or 0)
@@ -709,13 +711,16 @@ class CreateOrderView(APIView):
                 zhiding_user = User.query.filter(
                     UserUID=zhiding,
                     #user_type='PlayerID'
-                ).first()
+                ).select_related('DashouProfile').first()
 
                 if not zhiding_user:
                     return Response({'code': 7, 'msg': '指定打手不存在', 'data': None})
 
                 # 查询打手扩展表
-                dashou_profile = UserDashou.query.filter(user=zhiding_user).first()
+                try:
+                    dashou_profile = zhiding_user.DashouProfile
+                except UserDashou.DoesNotExist:
+                    dashou_profile = None
 
                 if not dashou_profile:
                     return Response({'code': 8, 'msg': '指定用户不存在或已封禁', 'data': None})