fix(nixos): open port 22000 for rustdesk and add freerdp

- Added TCP port 22000 to networking.firewall.allowedTCPPorts for rustdesk server access
- Included freerdp package in GUI services module
- Maintains consistency with recent configuration refactorings and feature additions

systems/x86_64-linux/x1/default.nix

@@ -12,6 +12,9 @@ with lib.metacfg;
   ];
 
   services.rustdesk-server.signal.enable = false;
+  networking.firewall.allowedTCPPorts = [
+    22000
+  ];
 
   services.tailscale.enable = true;