feat: enable TeamViewer on Zenith

Preserve the existing remote-support change and commented temporary Xorg/Xfce options. Those options remain disabled; runtime support was not validated during cleanup.

modules/hosts/zenith/default.nix

@@ -38,5 +38,9 @@ in
     ];
 
     services.fwupd.enable = true;
+    services.teamviewer.enable = true;
+    # Temporary Xorg session for remote support.
+    # services.xserver.enable = true;
+    # services.xserver.desktopManager.xfce.enable = true;
   };
 }