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/sections.py

@@ -1,4 +1,4 @@
-import hmac
+import hmac
 import threading
 import traceback
 import uuid
@@ -173,19 +173,27 @@ class HqbkxxView(APIView):
                 price_map[row.huiyuan_id] = row
 
         huiyuan_list = []
-        for hy in Huiyuan.query.all():
-            row = price_map.get(hy.huiyuan_id)
+        # 在受限 scope 下预过滤，避免 Huiyuan 全表遍历
+        # 注：当 scope != DATA_SCOPE_ALL 且 club_id != CLUB_ID_DEFAULT 时，
+        # 只有 price_map 中存在记录的会员才可能被保留（无记录的会被跳过）
+        huiyuan_qs = Huiyuan.query.all()
+        if scope != DATA_SCOPE_ALL and club_id != CLUB_ID_DEFAULT:
+            huiyuan_qs = huiyuan_qs.filter(huiyuan_id__in=list(price_map.keys()))
+        # 仅查询所需字段，减少内存占用（dict 比 model 实例更轻）
+        huiyuan_qs = huiyuan_qs.values('huiyuan_id', 'jieshao', 'bankuai_id', 'jiage', 'guanshifc', 'zuzhangfc')
+        for hy in huiyuan_qs:
+            row = price_map.get(hy['huiyuan_id'])
             if scope != DATA_SCOPE_ALL and club_id != CLUB_ID_DEFAULT and row is None:
                 continue
             if row is not None and not row.is_enabled:
                 continue
             item = {
-                'huiyuan_id': hy.huiyuan_id,
-                'jieshao': hy.jieshao,
-                'bankuai_id': hy.bankuai_id,
-                'jiage': str(row.jiage) if row else str(hy.jiage),
-                'guanshifc': str(row.guanshifc) if row else str(hy.guanshifc),
-                'zuzhangfc': str(row.zuzhangfc) if row else str(hy.zuzhangfc),
+                'huiyuan_id': hy['huiyuan_id'],
+                'jieshao': hy['jieshao'],
+                'bankuai_id': hy['bankuai_id'],
+                'jiage': str(row.jiage) if row else str(hy['jiage']),
+                'guanshifc': str(row.guanshifc) if row else str(hy['guanshifc']),
+                'zuzhangfc': str(row.zuzhangfc) if row else str(hy['zuzhangfc']),
             }
             huiyuan_list.append(item)