refactor(gui): replace GNOME remote desktop with XRDP

- Switched from GNOME remote desktop to XRDP for remote access services across configurations.
- Removed GNOME-specific settings and added XRDP service settings in GUI and system modules.
- Enhances flexibility and aligns remote desktop service configuration.

modules/nixos/services/gui/default.nix

@@ -207,11 +207,8 @@ in
     };
 
     # remote desktop
-    networking.firewall.allowedTCPPorts = [ 3389 ];
-    networking.firewall.allowedUDPPorts = [ 3389 ];
-    services.gnome.gnome-remote-desktop.enable = true;
-    systemd.services.gnome-remote-desktop = {
-      wantedBy = [ "graphical.target" ];
-    };
+    services.xrdp.enable = true;
+    services.xrdp.defaultWindowManager = "${pkgs.gnome-session}/bin/gnome-session";
+    services.xrdp.openFirewall = true;
   };
 }

systems/aarch64-linux/m4nix/default.nix

@@ -34,10 +34,6 @@ with lib.metacfg;
     ];
   };
 
-  services.xrdp.enable = true;
-  services.xrdp.defaultWindowManager = "${pkgs.gnome-session}/bin/gnome-session";
-  services.xrdp.openFirewall = true;
-
   # Disable the GNOME3/GDM auto-suspend feature that cannot be disabled in GUI!
   # If no user is logged in, the machine will power down after 20 minutes.
   systemd.targets.sleep.enable = false;

systems/aarch64-linux/rnix/default.nix

@@ -34,10 +34,6 @@ with lib.metacfg;
     ];
   };
 
-  services.xrdp.enable = true;
-  services.xrdp.defaultWindowManager = "${pkgs.gnome-session}/bin/gnome-session";
-  services.xrdp.openFirewall = true;
-
   # Disable the GNOME3/GDM auto-suspend feature that cannot be disabled in GUI!
   # If no user is logged in, the machine will power down after 20 minutes.
   systemd.targets.sleep.enable = false;