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.

installer/install.sh

@@ -125,7 +125,7 @@ header() {
     nrun gum style \
         --foreground 212 --border-foreground 212 --border double \
         --align center --width 60 --margin "1 2" --padding "2 4" \
-        "NOMARCHY INSTALLER" "NixOS with Omarchy flavor"
+        "NOMARCHY INSTALLER" "Nomarchy Distribution"
     echo ""
 }
 
@@ -876,10 +876,10 @@ execute_installation() {
         success "Impermanence configured"
     fi
 
-    # 9.7 Install the NixOS system from the freshly-generated flake.
+    # 9.7 Install the Nomarchy system from the freshly-generated flake.
     info "Running nixos-install (this will take a while)..."
     nixos-install --flake "/mnt/etc/nixos#$HOSTNAME" --no-root-passwd
-    success "NixOS installed"
+    success "Nomarchy installed"
 
     # 9.8 Activate Home Manager for $USERNAME inside the new system so the
     # user's first login already has Nomarchy's dotfiles. `home-manager