feature(compositor): add a module for the wayland compositor

modules/nixos/compositor.nix

@@ -3,4 +3,9 @@
 {
   # just enable and install niri
   programs.niri.enable = true;
+
+  # Add compositor-related packages
+  environment.systemPackages = with pkgs; [
+    xwayland-satellite
+  ];
 }