Remote: Ctrl+C Handling im PS-Script + /remote Alias

- CancelKeyPress-Event registrieren → .Cancel() → ReceiveAsync bricht sauber ab
- catch [AggregateException] für CancellationToken in .GetAwaiter().GetResult()
- Event-Handler im finally-Block entfernen
- /remote als Alias für /remote.ps1

Endpoints/RemoteEndpoint.cs

@@ -31,6 +31,7 @@ public static class RemoteEndpoint
 
         // PowerShell-Script ausliefern
         app.MapGet("/remote.ps1", (Delegate)ServeScript);
+        app.MapGet("/remote", (Delegate)ServeScript);
     }
 
     private static async Task HandleWebSocket(HttpContext ctx, RemoteConnectionManager mgr)