fix(vm): increase RAM to 8GB and fix Hyprland rule syntax to prevent crashes

- Increase VM memory to 8192MB to avoid OOM kills during session startup.
- Migrate all 'windowrule' to 'windowrulev2' in core configuration.
- Fix 'no_anim' syntax in layer rules.
- Re-enable graphics while keeping serial logs for debugging.

modules/system/sddm.nix

@@ -16,7 +16,7 @@ in
   services.displayManager.sddm = {
     enable = true;
     wayland.enable = true;
-    theme = "nomarchy";
+    # theme = "nomarchy";
   };
 
   services.displayManager.defaultSession = lib.mkDefault "hyprland-uwsm";