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

backend/views/penalties.py

@@ -1,4 +1,4 @@
-import hmac
+import hmac
 import threading
 import traceback
 import uuid
@@ -518,13 +518,15 @@ class FaKuanChuangJianView(APIView):
                         user=request.user,
                     ),
                 )
-                for relative_url in uploaded_urls:
-                    PenaltyAppealImage.query.create(
+                PenaltyAppealImage.objects.bulk_create([
+                    PenaltyAppealImage(
                         Penalty=penalty,
                         PenalizedUserID=PenalizedUserID,
                         ImageURL=relative_url,
-                        Purpose=1
+                        Purpose=1,
                     )
+                    for relative_url in uploaded_urls
+                ])
                 from users.fadan_fenhong_utils import lock_penalty_bonus
                 lock_penalty_bonus(penalty)