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>

SECURITY.md

@@ -8,7 +8,7 @@
  # FILE INFORMATION
  DEFGROUP: Joomla.Template
  INGROUP: MokoCassiopeia.Governance
- REPO: https://github.com/mokoconsulting-tech/MokoCassiopeia
+ REPO: https://git.mokoconsulting.tech/MokoConsulting/MokoCassiopeia
  FILE: SECURITY.md
  VERSION: 03.09.03
  BRIEF: Security policy and vulnerability reporting process for MokoCassiopeia.
@@ -169,7 +169,7 @@ If you want credit, include the name or handle to list in an advisory. If you pr
 ## Metadata
 
 * **Document:** SECURITY.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:** /SECURITY.md
 * **Owner:** Moko Consulting
 * **Version:** 03.06.00