fix: 添加后台用户不再硬编码绑定客服角色，按所选俱乐部角色分配

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/views/roles.py

@@ -870,11 +870,13 @@ class AddAdminUserView(APIView):
 
         if not isinstance(role_codes, list):
             return Response({'code': 400, 'msg': 'role_codes 格式错误'})
+        if not role_codes:
+            return Response({'code': 400, 'msg': '请至少选择一个角色'})
 
-        # 分配角色（默认客服 + 所选角色，去重；任一角色找不到则整单拒绝）
+        # 仅绑定前端所选角色（各俱乐部角色名不同，勿硬编码「客服」）
         role_names_to_bind = []
         seen_names = set()
-        for name in (['客服'] if '客服' not in role_codes else []) + list(role_codes):
+        for name in role_codes:
             n = (name or '').strip()
             if n and n not in seen_names:
                 seen_names.add(n)