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.

core/system/branding.nix

@@ -1,4 +1,4 @@
-{ ... }:
+{ lib, ... }:
 
 {
   # Identify the distribution as Nomarchy in /etc/os-release.
@@ -8,4 +8,10 @@
     distroId = "nomarchy";
     distroName = "Nomarchy";
   };
+
+  # Ensure the bootloader entries use Nomarchy instead of NixOS
+  boot.loader.grub.configurationName = lib.mkDefault "Nomarchy";
+  # For systemd-boot, NixOS 24.11+ uses distroName if available, 
+  # but some older versions or specific setups might need explicit labels.
+  # We use mkDefault so users can still override if they want.
 }