- Add fix-gitea-runner-config.yml to diagnose runner configuration issues
- Add register-gitea-runner.yml to re-register runner with correct Gitea URL
- Check for GitHub URLs in runner configuration (should only use git.michaelschiemer.de)
- Verify .env file has correct GITEA_INSTANCE_URL
- Fixes 504 timeouts caused by runner trying to connect to GitHub fallback
