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-build-live-iso

@@ -0,0 +1,17 @@
+#!/usr/bin/env bash
+
+# Build the Nomarchy Live ISO (Full Desktop Environment) using the flake.
+
+echo "Building Nomarchy Live ISO..."
+
+# The output will be a symlink named 'result' in the current directory
+nix build .#nixosConfigurations.nomarchy-live.config.system.build.isoImage
+
+if [ $? -eq 0 ]; then
+    ISO_PATH=$(readlink -f result/iso/*.iso)
+    echo "Success! Live ISO built at: $ISO_PATH"
+    echo "You can now burn this to a USB drive using 'dd' or 'etcher'."
+else
+    echo "Error: Live ISO build failed."
+    exit 1
+fi