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/ViewModels/MainViewModel.cs

@@ -20,6 +20,7 @@ public partial class MainViewModel : ObservableObject
     private readonly IDataService _dataService;
     private readonly IProcessExecutionService _processService;
     private readonly IServiceProvider _serviceProvider;
+    private readonly HotKeyManager _hotKeyManager;
 
     /// <summary>
     /// 全部分类的虚拟对象
@@ -30,12 +31,14 @@ public partial class MainViewModel : ObservableObject
         ILogService logService,
         IDataService dataService,
         IProcessExecutionService processService,
-        IServiceProvider serviceProvider)
+        IServiceProvider serviceProvider,
+        HotKeyManager hotKeyManager)
     {
         _logService = logService;
         _dataService = dataService;
         _processService = processService;
         _serviceProvider = serviceProvider;
+        _hotKeyManager = hotKeyManager;
 
         LoadData();
     }
@@ -201,9 +204,20 @@ public partial class MainViewModel : ObservableObject
         // 恢复之前选中的分类（若仍存在），否则选中"全部"
         SelectedCategory = Categories.FirstOrDefault(c => c.Id == previousCategoryId) ?? AllCategory;
         ApplyFilter();
+
+        // 工具列表变更后重新注册快捷键
+        RegisterAllHotKeys();
     }
 
-    // ───────────────────────────── 初始化 ─────────────────────────────
+    // ───────────────────────────── 快捷键 ─────────────────────────────
+
+    /// <summary>
+    /// 注册所有工具的全局快捷键（由 MainWindow.OnSourceInitialized 及数据变更后调用）
+    /// </summary>
+    public void RegisterAllHotKeys()
+    {
+        _hotKeyManager.RegisterAll(Tools);
+    }
 
     private void LoadData()
     {