feat: bundle MokoOnyx template as sub-extension of pkg_mokowaas

Adds MokoOnyx as a git submodule at src/packages/tpl_mokoonyx (pinned
to main branch) so it packages alongside all other MokoWaaS extensions.
Every WaaS site uses both, so installing them as a single package
ensures they stay in sync.

- Added submodule for MokoOnyx repo
- Added template entry to pkg_mokowaas.xml
- Added mokoonyx to protected extensions in script.php
- Added submodules: recursive to CI checkout steps

Authored-by: Moko Consulting
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/script.php

@@ -217,6 +217,7 @@ class Pkg_MokowaasInstallerScript
 				$db->quote('mokowaasdemo'),
 				$db->quote('mokowaassync'),
 				$db->quote('perfectpublisher'),
+				$db->quote('mokoonyx'),
 			];
 
 			$query = $db->getQuery(true)