feat(desktop): 增加桌面端系统托盘和窗口管理功能

- 主函数中添加窗口管理初始化，支持Windows、Linux和MacOS平台
- HomeScreen中集成托盘服务和窗口服务，实现托盘菜单交互
- 实现窗口关闭时弹出对话框，支持最小化到托盘或退出程序
- 添加托盘服务TrayService，封装系统托盘图标和菜单的初始化、事件处理
- 添加窗口服务WindowService，实现窗口的显示、隐藏、关闭及事件监听
- 在界面添加最小化到托盘的按钮，仅桌面端显示
- pubspec.yaml添加assets目录，包含托盘图标资源文件

home_monitor/pubspec.yaml

@@ -80,10 +80,9 @@ flutter:
   # the material Icons class.
   uses-material-design: true
 
-  # To add assets to your application, add an assets section, like this:
-  # assets:
-  #   - images/a_dot_burr.jpeg
-  #   - images/a_dot_ham.jpeg
+  # 资源文件
+  assets:
+    - assets/
 
   # An image asset can refer to one or more resolution-specific "variants", see
   # https://flutter.dev/to/resolution-aware-images