feat: user related logic refactor

src/main/java/xin/merlin/myplayerbackend/service/impl/UserServiceImpl.java

@@ -0,0 +1,10 @@
+package xin.merlin.myplayerbackend.service.impl;
+
+import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
+import org.springframework.stereotype.Service;
+import xin.merlin.myplayerbackend.entity.UserInfo;
+import xin.merlin.myplayerbackend.mapper.UserMapper;
+
+@Service
+public class UserServiceImpl extends ServiceImpl<UserMapper, UserInfo> {
+}