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

users/views/chufa.py

@@ -526,16 +526,16 @@ class DashouShensuView(APIView):
                 chufa_record.save()
 
                 # 6. 保存申诉图片（如果有）
-                saved_tupian_urls = []
-                if shensu_tupian_urls:
-                    for tupian_url in shensu_tupian_urls:
-                        if tupian_url:  # 确保URL不为空
-                            chufa_tupian = PenaltyEvidenceImage.query.create(
-                                OrderID=chufa_record.OrderID,
-                                UserID=yonghuid,
-                                ImageURL=tupian_url
-                            )
-                            saved_tupian_urls.append(tupian_url)
+                saved_tupian_urls = [u for u in shensu_tupian_urls if u] if shensu_tupian_urls else []
+                if saved_tupian_urls:
+                    PenaltyEvidenceImage.objects.bulk_create([
+                        PenaltyEvidenceImage(
+                            OrderID=chufa_record.OrderID,
+                            UserID=yonghuid,
+                            ImageURL=tupian_url,
+                        )
+                        for tupian_url in saved_tupian_urls
+                    ])
 
                 # 7. 构建返回数据
                 response_data = {