✨ 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/DesignTime/DesignTimeViewModelLocator.cs

@@ -1,4 +1,5 @@
 using AxiOmron.PcbCheck.Options;
+using AxiOmron.PcbCheck.Services.Interfaces;
 using AxiOmron.PcbCheck.ViewModels;
 
 namespace AxiOmron.PcbCheck.DesignTime;
@@ -12,6 +13,8 @@ public sealed class DesignTimeViewModelLocator
     private readonly DesignTimeDispatcherService _dispatcherService = new();
     private readonly DesignTimeWorkflowControlService _workflowControlService = new();
     private readonly DesignTimeAppConfigService _appConfigService = new();
+    private readonly DesignTimeAdminUnlockDialogService _adminUnlockDialogService = new();
+    private readonly DesignTimeSftpLookupService _sftpLookupService = new();
     private MainWindowViewModel? _mainWindowViewModel;
     private SystemSettingViewModel? _systemSettingViewModel;
 
@@ -25,7 +28,7 @@ public sealed class DesignTimeViewModelLocator
     /// 获取系统设置设计时视图模型。
     /// </summary>
     public SystemSettingViewModel SystemSettingViewModel
-        => _systemSettingViewModel ??= new SystemSettingViewModel(_appConfigService);
+        => _systemSettingViewModel ??= new SystemSettingViewModel(_appConfigService, _sftpLookupService);
 
     /// <summary>
     /// 创建首页设计时视图模型。
@@ -34,6 +37,6 @@ public sealed class DesignTimeViewModelLocator
     private MainWindowViewModel CreateMainWindowViewModel()
     {
         AppConfig config = _appConfigService.Load();
-        return new MainWindowViewModel(_appStateStore, _dispatcherService, _workflowControlService, config);
+        return new MainWindowViewModel(_appStateStore, _dispatcherService, _workflowControlService, config, _adminUnlockDialogService);
     }
 }