fix: 修复 SDK 2.4.0 + WPF/WinForms 双开下的编译错误

dotnet 8.0.424 SDK + Microsoft.WindowsAppSDK 2.4.0 实测 build 通过(0 警告 0 错误)。

修复内容:

- csproj:TargetFramework 从 net8.0-windows 改为 net8.0-windows10.0.19041.0,新增 SupportedOSPlatformVersion=10.0.17763.0(WindowsAppSDK 2.4.0 强制要求 TFM 带 Windows 版本号)

- 4 个 Services 文件加 using System.IO(Logger/ConfigService/StateService/GotifyWebSocketService)。WPF+WinForms 双开项目模板不自动 import System.IO

- GotifyApiService 加 using System.Net.Http(同上,HttpClient 不在 implicit usings)

- App.xaml.cs:using Application = System.Windows.Application(WPF/WinForms Application 撞名)

- MainWindow.xaml.cs:using MessageBox = System.Windows.MessageBox(同上,MessageBox 撞名)

- App.xaml.cs:SendTestNotificationAsync 里 Date 从 .UtcNow.ToUnixTimeMilliseconds() 改回 .UtcNow(原 plan 写法有 bug,long 塞不进 DateTimeOffset)

- App.xaml.cs:OnNotificationInvoked 重写:WindowsAppSDK 2.4.0 把 args.Arguments 从 string 改成 IDictionary<string,string>,改用 TryGetValue("url", out var url) 取参数

- NotificationService:AddArgument 从单参 "url=escaped" 改成两参 ("url", url)。WindowsAppSDK 2.4.0 不再支持单参 "key=value" 写法

- GotifyWebSocketService:删除 _forceReconnect 字段(写了不读,改成 RequestReconnect 只调 socket.Abort 让外层 RunLoopAsync 自然重连)

Services/GotifyWebSocketService.cs

@@ -1,3 +1,4 @@
+using System.IO;
 using System.Net.WebSockets;
 using System.Text;
 using System.Text.Json;
@@ -18,7 +19,6 @@ public sealed class GotifyWebSocketService
     private readonly object _socketLock = new();
     private ClientWebSocket? _socket;
     private bool _running;
-    private bool _forceReconnect;
 
     /// <summary>
     /// 收到一条新消息(已去重、未越界)时触发,UI 用来追加到历史列表。
@@ -53,7 +53,7 @@ public sealed class GotifyWebSocketService
 
     public void RequestReconnect()
     {
-        _forceReconnect = true;
+        // 直接 Abort 当前 socket,ConnectAndReceiveAsync 会抛 → 外层 RunLoopAsync 自动重连
         lock (_socketLock)
         {
             try
@@ -123,7 +123,6 @@ public sealed class GotifyWebSocketService
             if (!_running || _lifetimeCts.IsCancellationRequested)
                 break;
 
-            _forceReconnect = false;
             _logger.Info($"Reconnect after {delay}s.");
             _statusChanged($"{delay}s 后重连");