fix(vm): restore Plymouth splash and fix SDDM session selection

- Restore 'quiet' and 'splash' to kernel parameters to enable Plymouth.
- Re-enable graphics and virtio drivers for VM configurations.
- Add Interface=Qt5 to SDDM theme metadata for proper loading.
- Set default autoLogin.session to hyprland-uwsm to ensure correct session start.
- Enable services.xserver for improved display manager compatibility.

modules/system/sddm.nix

@@ -12,6 +12,7 @@ let
   };
 in
 {
+  services.xserver.enable = true;
   services.displayManager.sddm = {
     enable = true;
     wayland.enable = true;
@@ -21,6 +22,7 @@ in
   services.displayManager.autoLogin = {
     enable = lib.mkDefault true;
     user = lib.mkDefault "nomarchy";
+    session = lib.mkDefault "hyprland-uwsm";
   };
 
   environment.systemPackages = [ nomarchy-sddm-theme ];