Add desktop discovery responder

WirelessTextSyncer.Windows/Tray/TrayApplicationContext.cs

@@ -6,6 +6,7 @@ public sealed class TrayApplicationContext : ApplicationContext
 {
     private readonly KeyboardInjectionService keyboard;
     private readonly WebSocketServerService server;
+    private readonly DiscoveryResponderService discovery;
     private readonly NotifyIcon notifyIcon;
     private ToolStripMenuItem? clipboardPasteMenuItem;
     private ToolStripMenuItem? sendInputTypingMenuItem;
@@ -18,6 +19,7 @@ public sealed class TrayApplicationContext : ApplicationContext
 
         server = new WebSocketServerService(handler);
         server.StatusChanged += (_, _) => UpdateTrayText();
+        discovery = new DiscoveryResponderService(() => server.LocalIpAddress, () => server.Port);
 
         notifyIcon = new NotifyIcon
         {
@@ -31,6 +33,7 @@ public sealed class TrayApplicationContext : ApplicationContext
         try
         {
             server.Start(8181);
+            discovery.Start();
             UpdateTrayText();
         }
         catch (Exception ex)
@@ -47,6 +50,7 @@ public sealed class TrayApplicationContext : ApplicationContext
         if (disposing)
         {
             notifyIcon.Dispose();
+            discovery.Dispose();
             server.Dispose();
         }