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

home.nix

@@ -38,7 +38,7 @@
     # System monitoring
     btop
     htop
-    nvtopPackages.full
+    nvtop
 
     # Media
     mpv