Change runner from runners-farhoodlabs to ubuntu-latest across all fork
workflows. Update container registry from ghcr.io to git.farh.net and
authenticate with REGISTRY_TOKEN. Migrate update-infra API calls from
GitHub to Gitea. Disable refresh-lockfile.yml (requires GitHub gh CLI).
Update CLAUDE.md references.
Co-Authored-By: Paperclip <noreply@paperclip.ing>