这是使用PyQT5作为UI的首次提交,将后端和UI合并到1个工程中，统一使用了Python，没有使用JS和HTML

UI/ui_utils/user_session.py

@@ -0,0 +1,88 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+"""
+用户会话管理模块
+用于存储和管理当前登录用户的信息
+"""
+
+
+class UserSession:
+    """单例模式的用户会话管理器"""
+    
+    _instance = None
+    _user_info = None
+    
+    def __new__(cls):
+        if cls._instance is None:
+            cls._instance = super(UserSession, cls).__new__(cls)
+        return cls._instance
+    
+    @classmethod
+    def set_user_info(cls, user_info):
+        """
+        设置当前登录用户信息
+        
+        Args:
+            user_info (dict): 用户信息，包含 username, userid, role, auth 等字段
+        """
+        cls._user_info = user_info
+        print(f"[UserSession] 用户登录成功: {user_info.get('username')} (角色: {user_info.get('role')})")
+    
+    @classmethod
+    def get_user_info(cls):
+        """
+        获取当前登录用户信息
+        
+        Returns:
+            dict: 用户信息，如果未登录则返回 None
+        """
+        return cls._user_info
+    
+    @classmethod
+    def get_username(cls):
+        """获取当前用户名"""
+        return cls._user_info.get('username') if cls._user_info else None
+    
+    @classmethod
+    def get_userid(cls):
+        """获取当前用户ID"""
+        return cls._user_info.get('userid') if cls._user_info else None
+    
+    @classmethod
+    def get_role(cls):
+        """获取当前用户角色"""
+        return cls._user_info.get('role') if cls._user_info else None
+    
+    @classmethod
+    def get_auth(cls):
+        """获取当前用户权限"""
+        return cls._user_info.get('auth') if cls._user_info else None
+    
+    @classmethod
+    def is_logged_in(cls):
+        """检查是否已登录"""
+        return cls._user_info is not None
+    
+    @classmethod
+    def is_super(cls):
+        """检查是否为超级管理员"""
+        return cls.get_role() == 'super'
+    
+    @classmethod
+    def is_admin(cls):
+        """检查是否为管理员"""
+        role = cls.get_role()
+        return role in ['super', 'admin']
+    
+    @classmethod
+    def is_engineer(cls):
+        """检查是否为工程师"""
+        role = cls.get_role()
+        return role in ['super', 'admin', 'engineer']
+    
+    @classmethod
+    def clear(cls):
+        """清除用户会话（登出）"""
+        cls._user_info = None
+        print("[UserSession] 用户已登出")