获取管理后台统计数据

{
    "Success": true,
    "Message": "string",
    "Data": {
        "UserCount": 0,
        "PostCount": 0,
        "ResourceCount": 0,
        "CommentCount": 0,
        "TodayNewUserCount": 0,
        "TodayNewPostCount": 0,
        "PendingPostCount": 0,
        "PendingResourceCount": 0,
        "PendingVersionCount": 0
    }
}