sync: secret names Gitea accepts (SYNC_GITHUB_KEY, SYNC_GITHUB_TOKEN) (#179) Gitea refuses secret names starting GITHUB_ or GITEA_, so the GitHub copy's deploy key is in SYNC_GITHUB_KEY. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_017K4vyY3yUD3GsvoZaAtKkD