Fix package conflicts and add ISO configuration

- Fixed nvtop package reference (nvtopPackages.full -> nvtop)
- Fixed display manager conflicts in ISO config
- Fixed SSH settings conflicts with lib.mkForce
- Fixed home-manager username conflicts for ISO
- Added complete ISO build configuration with Wayland-only setup
- Added ISO build documentation and scripts

assets/logo.png

@@ -0,0 +1,5 @@
+# This is a placeholder for the OmniXY logo
+# Replace this with an actual PNG file for the ISO splash screen
+# For now, we'll create a simple SVG that can be converted to PNG
+
+echo "Creating placeholder logo..."