Phase 4: 全局快捷键拦截 (Win32 API)

- 新增 HotKeyManager (Helpers/), 使用 user32.dll RegisterHotKey/UnregisterHotKey 注册系统级快捷键

- 支持 Ctrl/Alt/Shift/Win 修饰键组合, 单字符键和命名键(F1-F12等)解析

- MainWindow.OnSourceInitialized 挂载 HwndSource.AddHook 拦截 WM_HOTKEY 消息

- 启动时自动注册所有含快捷键的工具, 工具增删改后自动重新注册

- 快捷键冲突时记录 Win32 错误码, 无效格式打印警告

- 新增 12 个 HotKeyManager 单元测试 (73 tests total)

PersonalToolBox/Views/MainWindow.xaml.cs

@@ -3,6 +3,8 @@ using System.Collections.Specialized;
 using System.Globalization;
 using System.Windows;
 using System.Windows.Data;
+using System.Windows.Interop;
+using PersonalToolBox.Helpers;
 using PersonalToolBox.ViewModels;
 
 namespace PersonalToolBox.Views;
@@ -10,17 +12,45 @@ namespace PersonalToolBox.Views;
 public partial class MainWindow : Window
 {
     private readonly MainViewModel _viewModel;
+    private readonly HotKeyManager _hotKeyManager;
 
-    public MainWindow(MainViewModel viewModel)
+    public MainWindow(MainViewModel viewModel, HotKeyManager hotKeyManager)
     {
         InitializeComponent();
 
         _viewModel = viewModel;
+        _hotKeyManager = hotKeyManager;
         DataContext = viewModel;
 
         viewModel.Logs.CollectionChanged += OnLogsCollectionChanged;
     }
 
+    /// <summary>
+    /// 窗口句柄就绪后注册全局快捷键
+    /// </summary>
+    protected override void OnSourceInitialized(EventArgs e)
+    {
+        base.OnSourceInitialized(e);
+
+        var hwndSource = (HwndSource)PresentationSource.FromVisual(this)!;
+        _hotKeyManager.Initialize(hwndSource.Handle);
+
+        // 挂载 WndProc 钩子，拦截 WM_HOTKEY 消息
+        hwndSource.AddHook(WndProcHook);
+
+        // 注册所有已配置快捷键的工具
+        _viewModel.RegisterAllHotKeys();
+    }
+
+    /// <summary>
+    /// 窗口消息钩子
+    /// </summary>
+    private IntPtr WndProcHook(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
+    {
+        handled = _hotKeyManager.TryHandleMessage(msg, wParam, lParam);
+        return IntPtr.Zero;
+    }
+
     private void OnLogsCollectionChanged(object? sender, NotifyCollectionChangedEventArgs e)
     {
         if (e.Action == NotifyCollectionChangedAction.Add && LogListBox.Items.Count > 0)