【优化】移除后台会员列表分页联表中的childNum赋值，调整为接口端直接查询

CoreCms.Net.Web.WebApi/Controllers/UserController.cs

@@ -2082,13 +2082,13 @@ namespace CoreCms.Net.Web.WebApi.Controllers
             var data = await _userServices.QueryPageAsync(where, p => p.createTime, OrderByType.Desc, entity.page, entity.limit);
 
             jm.status = true;
-            jm.data = data.Select(p => new
+            jm.data = data.Select(async p => new
             {
                 p.nickName,
                 p.avatarImage,
                 mobile = UserHelper.FormatMobile(p.mobile),
                 p.createTime,
-                p.childNum
+                childNum = await _userServices.GetCountAsync(p => p.parentId == p.id)
             });
             jm.otherData = new
             {