Phase 5: 系统托盘与开机自启

- 系统托盘: NotifyIcon 常驻, 程序化生成 32x32 图标, 左键切换显示/隐藏, 右键菜单(显示主界面/设置/彻底退出)

- 窗口关闭拦截: OnClosing 取消关闭改为 Hide(), 退出菜单执行真实 Shutdown()

- 开机自启: AutoStartHelper 写入/删除 HKCU\...\Run 注册表项, UI 开关按钮显示 ✔/⊗ 状态

- 静默启动: -autostart 参数下 mainWindow.Hide() 直接最小化到托盘

- 类型冲突解决: ImplicitUsings=disable + GlobalUsings.cs 统一全局 using, 消除 WPF/WinForms 共享类型冲突

- 测试: 75 tests total (含 AutoStartHelper 2 tests)

PersonalToolBox/Views/MainWindow.xaml

@@ -81,6 +81,7 @@
                         <RowDefinition Height="50"/>
                         <RowDefinition Height="*"/>
                         <RowDefinition Height="42"/>
+                        <RowDefinition Height="42"/>
                         <RowDefinition Height="45"/>
                     </Grid.RowDefinitions>
 
@@ -160,6 +161,28 @@
                     </Button>
 
                     <Button Grid.Row="3"
+                            Command="{Binding ToggleAutoStartCommand}"
+                            Background="Transparent"
+                            BorderThickness="1"
+                            BorderBrush="{DynamicResource Theme.CardBorder}"
+                            Foreground="{DynamicResource Theme.Foreground}"
+                            FontSize="12"
+                            Height="35" Margin="10,0,10,3"
+                            Cursor="Hand">
+                        <Button.Resources>
+                            <Style TargetType="TextBlock">
+                                <Setter Property="Text" Value="⊗ 开机自启: 关"/>
+                                <Style.Triggers>
+                                    <DataTrigger Binding="{Binding IsAutoStart}" Value="True">
+                                        <Setter Property="Text" Value="✔ 开机自启: 开"/>
+                                    </DataTrigger>
+                                </Style.Triggers>
+                            </Style>
+                        </Button.Resources>
+                        <TextBlock VerticalAlignment="Center" TextAlignment="Center"/>
+                    </Button>
+
+                    <Button Grid.Row="4"
                             Command="{Binding ToggleThemeCommand}"
                             Background="Transparent"
                             BorderThickness="1"