feat(distro): rename ISO targets and fix UEFI boot in live test script

- Rename installerIso and installerIsoGraphical to nomarchy-installer and nomarchy-live.
- Update host configurations with proper Nomarchy branding and volume IDs.
- Fix nomarchy-test-live-iso QEMU launch by using -drive if=pflash for UEFI firmware.
- Add nomarchy-build-live-iso utility script.
- Scrub remaining Omarchy references in Plymouth, installer messages, and docs.
- Regenerate docs/SCRIPTS.md to reflect new and renamed utilities.

features/scripts/utils/nomarchy-on-boot

@@ -22,7 +22,7 @@ fi
 # This part ensures that if we are on an installed system, the correct
 # nixos-hardware module is selected in the configuration.
 # Skip this in the Live ISO environment
-if [[ $USER == "nixos" ]] || [[ -f /etc/nixos/hosts/live-iso.nix ]]; then
+if [[ $USER == "nixos" ]] || [[ -f /etc/nixos/hosts/nomarchy-live.nix ]]; then
     exit 0
 fi