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 with git.mokoconsulting.tech/MokoConsulting
- Update .moko-standards governance file

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

docs/MODULE_OVERRIDES.md

@@ -22,7 +22,7 @@
  # FILE INFORMATION
  DEFGROUP: Joomla.Template.Site
  INGROUP: MokoCassiopeia.Documentation
- REPO: https://github.com/mokoconsulting-tech/MokoCassiopeia
+ REPO: https://git.mokoconsulting.tech/MokoConsulting/MokoCassiopeia
  FILE: docs/MODULE_OVERRIDES.md
  VERSION: 03.09.03
  BRIEF: Comprehensive guide to MokoCassiopeia mobile-responsive module overrides
@@ -647,7 +647,7 @@ Override CSS variables in your custom color scheme:
 ### Getting Help
 
 - **Documentation**: Check module-specific README files
-- **GitHub Issues**: [Report issues](https://github.com/mokoconsulting-tech/MokoCassiopeia/issues)
+- **GitHub Issues**: [Report issues](https://git.mokoconsulting.tech/MokoConsulting/MokoCassiopeia/issues)
 - **Support**: hello@mokoconsulting.tech
 
 ---
@@ -703,14 +703,14 @@ In your template's `index.php`, specify layout for entire module position:
 - **Main README**: [README.md](../README.md)
 - **Changelog**: [CHANGELOG.md](../CHANGELOG.md)
 - **CSS Variables**: [CSS_VARIABLES.md](CSS_VARIABLES.md)
-- **Repository**: [GitHub](https://github.com/mokoconsulting-tech/MokoCassiopeia)
+- **Repository**: [GitHub](https://git.mokoconsulting.tech/MokoConsulting/MokoCassiopeia)
 
 ---
 
 ## Metadata
 
 * Document: docs/MODULE_OVERRIDES.md
-* Repository: [https://github.com/mokoconsulting-tech/MokoCassiopeia](https://github.com/mokoconsulting-tech/MokoCassiopeia)
+* Repository: [https://git.mokoconsulting.tech/MokoConsulting/MokoCassiopeia](https://git.mokoconsulting.tech/MokoConsulting/MokoCassiopeia)
 * Path: /docs/MODULE_OVERRIDES.md
 * Owner: Moko Consulting
 * Version: 03.07.00