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

config/views/admin_stats.py

@@ -1,4 +1,4 @@
-import io
+import io
 import os
 import re
 import time
@@ -270,6 +270,13 @@ class DashouPaihangView(APIView):
             # 第一名数量不足，不展示
             return [], False
 
+        # 批量预取老板扩展表昵称
+        _boss_user_ids = [g.user_id for g in guanshi_list]
+        _boss_nicheng_map = {
+            b.user_id: b.nickname
+            for b in UserBoss.query.filter(user_id__in=_boss_user_ids).only('user_id', 'nickname')
+        }
+
         # 构建返回数据
         paihang_list = []
         for index, guanshi in enumerate(guanshi_list):
@@ -277,8 +284,7 @@ class DashouPaihangView(APIView):
             user_main = guanshi.user
 
             # 管事的昵称需要查询老板扩展表
-            boss_profile = UserBoss.query.filter(user=user_main).first()
-            guanshi_nicheng = boss_profile.nickname if boss_profile else '未设置昵称'
+            guanshi_nicheng = _boss_nicheng_map.get(guanshi.user_id, '未设置昵称')
 
             # 获取头像（相对URL）
             touxiang_url = user_main.Avatar or ''
@@ -337,6 +343,13 @@ class DashouPaihangView(APIView):
             # 第一名流水不足，不展示
             return [], False
 
+        # 批量预取老板扩展表昵称
+        _boss_user_ids = [s.user_id for s in shangjia_list]
+        _boss_nicheng_map = {
+            b.user_id: b.nickname
+            for b in UserBoss.query.filter(user_id__in=_boss_user_ids).only('user_id', 'nickname')
+        }
+
         # 构建返回数据
         paihang_list = []
         for index, shangjia in enumerate(shangjia_list):
@@ -344,8 +357,7 @@ class DashouPaihangView(APIView):
             user_main = shangjia.user
 
             # 商家的昵称需要查询老板扩展表
-            boss_profile = UserBoss.query.filter(user=user_main).first()
-            shangjia_nicheng = boss_profile.nickname if boss_profile else '未设置昵称'
+            shangjia_nicheng = _boss_nicheng_map.get(shangjia.user_id, '未设置昵称')
 
             # 获取头像（相对URL）
             touxiang_url = user_main.Avatar or ''
@@ -604,21 +616,21 @@ class GetXiugaiJiluView(APIView):
                 records = cursor.fetchall()
 
             # 🔥 6. 处理查询结果（严格按照字段类型处理）
+            # 预查询修改者账号信息（循环外执行一次，避免循环内重复查询同一 SQL）
+            xiugaizhe_zhanghao = ''
+            with connection.cursor() as cursor2:
+                cursor2.execute(
+                    "SELECT phone, yonghuid FROM user_main WHERE phone = %s OR yonghuid = %s LIMIT 1",
+                    [xiugaizhe_zhanghaoid, xiugaizhe_zhanghaoid]
+                )
+                xiugaizhe_info = cursor2.fetchone()
+                if xiugaizhe_info:
+                    xiugaizhe_zhanghao = str(xiugaizhe_info[0]) if xiugaizhe_info[0] else str(xiugaizhe_info[1]) if \
+                    xiugaizhe_info[1] else xiugaizhe_zhanghaoid
+
             jilu_list = []
             for record in records:
-                # 获取修改者账号信息（都是字符串）
-                xiugaizhe_zhanghao = ''
-                with connection.cursor() as cursor2:
-                    # 🔥 phone和yonghuid都是CharField，用字符串查询
-                    cursor2.execute(
-                        "SELECT phone, yonghuid FROM user_main WHERE phone = %s OR yonghuid = %s LIMIT 1",
-                        [xiugaizhe_zhanghaoid, xiugaizhe_zhanghaoid]
-                    )
-                    xiugaizhe_info = cursor2.fetchone()
-                    if xiugaizhe_info:
-                        # 🔥 都是字符串
-                        xiugaizhe_zhanghao = str(xiugaizhe_info[0]) if xiugaizhe_info[0] else str(xiugaizhe_info[1]) if \
-                        xiugaizhe_info[1] else xiugaizhe_zhanghaoid
+                # 修改者账号信息已预查询，直接使用
 
                 # 获取会员名称（如果有）
                 huiyuan_mingzi = ''