fix GET /user return the statistics of user

Change-Id: Ic17cd985e45daee3c242b699bfd3bfa11a46298e
diff --git a/src/main/java/com/example/g8backend/service/IUserService.java b/src/main/java/com/example/g8backend/service/IUserService.java
index d980543..c69cba5 100644
--- a/src/main/java/com/example/g8backend/service/IUserService.java
+++ b/src/main/java/com/example/g8backend/service/IUserService.java
@@ -3,6 +3,7 @@
 import com.baomidou.mybatisplus.extension.service.IService;
 import com.example.g8backend.entity.Message;
 import com.example.g8backend.entity.User;
+import com.example.g8backend.entity.UserStats;
 import org.apache.ibatis.annotations.Param;
 
 import java.util.List;
@@ -21,6 +22,9 @@
     int getFollowersCount(Long userId);
     boolean isFollowing(Long currentUserId, Long targetUserId);
 
+    // 用户统计
+    UserStats getUserStats(Long userId);
+
     // 私信功能
     Long sendMessage(Long senderId, Long receiverId, String content);
     List<Message> getMessages(Long userId, Long partnerId);