重新引入Redis；用户登录与管理员登录完成；引入NanoID代替UUID；调整Spring Boot idea中的启动参数；swagger页面描述信息完善；更新swagger，更新Api文档

bookshelfplus/src/main/java/plus/bookshelf/Service/Impl/UserServiceImpl.java

@@ -21,6 +21,14 @@ public class UserServiceImpl implements UserService {
         return userModel;
     }
 
+    @Override
+    public UserModel getUserById(Integer id) {
+        UserDO userDO = userDOMapper.selectByPrimaryKey(id);
+        UserModel userModel = convertFromDataObject(userDO);
+
+        return userModel;
+    }
+
     private UserModel convertFromDataObject(UserDO userDO) {
         if (userDO == null) {
             return null;