Initial commit: WpywMail 自建邮件系统：.NET 8 原生 SMTP/IMAP 服务端（DKIM 签名、SPF/DKIM/DMARC 入站校验、SQLite 存储、完整账号体系）、Node 服务端、WinUI 3 客户端与 Web 前端

client-winui/App.xaml.cs

@@ -0,0 +1,27 @@
+using Microsoft.UI.Xaml;
+
+namespace WpywMail.Client;
+
+public partial class App : Application
+{
+    public static Window? MainWindow { get; private set; }
+
+    public App()
+    {
+        UnhandledException += (_, args) =>
+        {
+            try { File.AppendAllText(Path.Combine(Path.GetTempPath(), "WpywMail.Client-error.log"), $"{DateTime.Now:O}\r\n{args.Exception}\r\n\r\n"); } catch { }
+        };
+        AppDomain.CurrentDomain.UnhandledException += (_, args) =>
+        {
+            try { File.AppendAllText(Path.Combine(Path.GetTempPath(), "WpywMail.Client-error.log"), $"{DateTime.Now:O}\r\n{args.ExceptionObject}\r\n\r\n"); } catch { }
+        };
+        InitializeComponent();
+    }
+
+    protected override void OnLaunched(LaunchActivatedEventArgs args)
+    {
+        MainWindow = new MainWindow();
+        MainWindow.Activate();
+    }
+}