✨ feat(*): 添加管理员解锁与 SFTP 探活能力

* 新增管理员解锁弹窗、手动操作权限控制与倒计时状态
* 支持系统设置页测试 SFTP 连接，并在启动时执行探活
* 补充设计时服务、全局异常兜底与相关单元测试

src/AxiOmron.PcbCheck/App.xaml.cs

@@ -1,11 +1,13 @@
 using System.IO;
 using System.Text;
 using System.Windows;
+using System.Windows.Threading;
 using AxiOmron.PcbCheck.Options;
 using AxiOmron.PcbCheck.Services.Implementations;
 using AxiOmron.PcbCheck.Services.Interfaces;
 using AxiOmron.PcbCheck.ViewModels;
 using AxiOmron.PcbCheck.Views.Pages;
+using AxiOmron.PcbCheck.Views.Windows;
 using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Hosting;
@@ -19,6 +21,7 @@ namespace AxiOmron.PcbCheck;
 /// </summary>
 public partial class App : Application
 {
+    private static readonly NLog.Logger FallbackLogger = NLog.LogManager.GetCurrentClassLogger();
     private IHost? _host;
 
     /// <summary>
@@ -33,6 +36,7 @@ public partial class App : Application
     protected override async void OnStartup(StartupEventArgs e)
     {
         base.OnStartup(e);
+        RegisterGlobalExceptionHandlers();
         try
         {
             Console.OutputEncoding = Encoding.UTF8;
@@ -53,6 +57,7 @@ public partial class App : Application
         }
         catch (Exception ex)
         {
+            LogGlobalException("应用启动失败", ex);
             MessageBox.Show($"应用启动失败: {ex.Message}", "Axi Omron PCB Check", MessageBoxButton.OK, MessageBoxImage.Error);
             Shutdown(-1);
         }
@@ -64,6 +69,7 @@ public partial class App : Application
     /// <param name="e">退出事件参数。</param>
     protected override async void OnExit(ExitEventArgs e)
     {
+        UnregisterGlobalExceptionHandlers();
         if (_host is not null)
         {
             try
@@ -118,13 +124,99 @@ public partial class App : Application
                 services.AddSingleton<WorkflowHostedService>();
                 services.AddSingleton<IWorkflowControlService>(sp => sp.GetRequiredService<WorkflowHostedService>());
                 services.AddHostedService(sp => sp.GetRequiredService<WorkflowHostedService>());
+                services.AddSingleton<IAdminUnlockDialogService, AdminUnlockDialogService>();
 
                 services.AddSingleton<MainWindowViewModel>();
                 services.AddSingleton<SystemSettingViewModel>();
                 services.AddSingleton<DashboardPage>();
                 services.AddSingleton<SystemSettingsPage>();
+                services.AddTransient<AdminUnlockDialog>();
                 services.AddSingleton<MainWindow>();
             })
             .Build();
     }
+
+    /// <summary>
+    /// 注册全局异常处理器，用于兜底记录 UI 线程、未观察任务和域级异常。
+    /// </summary>
+    private void RegisterGlobalExceptionHandlers()
+    {
+        DispatcherUnhandledException += OnDispatcherUnhandledException;
+        AppDomain.CurrentDomain.UnhandledException += OnCurrentDomainUnhandledException;
+        TaskScheduler.UnobservedTaskException += OnTaskSchedulerUnobservedTaskException;
+    }
+
+    /// <summary>
+    /// 注销全局异常处理器。
+    /// </summary>
+    private void UnregisterGlobalExceptionHandlers()
+    {
+        DispatcherUnhandledException -= OnDispatcherUnhandledException;
+        AppDomain.CurrentDomain.UnhandledException -= OnCurrentDomainUnhandledException;
+        TaskScheduler.UnobservedTaskException -= OnTaskSchedulerUnobservedTaskException;
+    }
+
+    /// <summary>
+    /// 处理 UI 线程未捕获异常，记录日志并阻止应用直接闪退。
+    /// </summary>
+    /// <param name="sender">事件源。</param>
+    /// <param name="e">异常事件参数。</param>
+    private void OnDispatcherUnhandledException(object sender, DispatcherUnhandledExceptionEventArgs e)
+    {
+        LogGlobalException("UI 线程未处理异常", e.Exception);
+        MessageBox.Show($"程序捕获到未处理异常，已写入日志：{e.Exception.Message}", "Axi Omron PCB Check", MessageBoxButton.OK, MessageBoxImage.Warning);
+        e.Handled = true;
+    }
+
+    /// <summary>
+    /// 处理未观察任务异常，记录日志并标记为已观察。
+    /// </summary>
+    /// <param name="sender">事件源。</param>
+    /// <param name="e">异常事件参数。</param>
+    private void OnTaskSchedulerUnobservedTaskException(object? sender, UnobservedTaskExceptionEventArgs e)
+    {
+        LogGlobalException("未观察任务异常", e.Exception);
+        e.SetObserved();
+    }
+
+    /// <summary>
+    /// 处理应用程序域未捕获异常，尽量在进程退出前补充日志。
+    /// </summary>
+    /// <param name="sender">事件源。</param>
+    /// <param name="e">异常事件参数。</param>
+    private void OnCurrentDomainUnhandledException(object? sender, UnhandledExceptionEventArgs e)
+    {
+        var exception = e.ExceptionObject as Exception ?? new Exception(e.ExceptionObject?.ToString() ?? "未知未处理异常");
+        LogGlobalException($"应用程序域未处理异常（IsTerminating={e.IsTerminating}）", exception);
+    }
+
+    /// <summary>
+    /// 统一记录全局异常日志，优先复用宿主日志器，失败时退回 NLog 直接写入。
+    /// </summary>
+    /// <param name="message">日志消息。</param>
+    /// <param name="exception">异常对象。</param>
+    private static void LogGlobalException(string message, Exception exception)
+    {
+        try
+        {
+            if (Services is not null)
+            {
+                var logger = Services.GetService<ILogger<App>>();
+                logger?.LogError(exception, message);
+            }
+        }
+        catch
+        {
+            // 忽略宿主日志失败，继续使用回退日志。
+        }
+
+        try
+        {
+            FallbackLogger.Error(exception, message);
+        }
+        catch
+        {
+            // 全局兜底日志不再向外抛出。
+        }
+    }
 }