feat: add Pa11y accessibility testing + migrate GitHub refs to Gitea

- Add Pa11y CI config template (templates/configs/pa11yci.json)
- Replace all github.com/mokoconsulting-tech refs with git.mokoconsulting.tech/MokoConsulting
- Update .moko-standards governance file with Gitea URLs

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

src/joomla.asset.json

@@ -12,7 +12,7 @@
 		"spdx_license": "GPL-3.0-or-later",
 		"notice": "This file is part of a Moko Consulting project.",
 		"disclaimer": "This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License; either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see https://www.gnu.org/licenses/.",
-		"repo": "https://github.com/mokoconsulting-tech/MokoCassiopeia",
+		"repo": "https://git.mokoconsulting.tech/MokoConsulting/MokoCassiopeia",
 		"file_information": {
 			"defgroup": "Joomla.Template.Site",
 			"ingroup": "MokoCassiopeia.Template.Assets",