Mirrors the buildfor_life_budget workflow pair: Gitea runs both
deploy and validate, GitHub mirrors validate only. Differences from
the sibling: pnpm + fnm instead of npm, Node pinned via .node-version,
and the repo is cloned over public HTTPS so no separate deploy key
is needed for git.b4l.co.th. Document required Gitea secrets in
DEPLOYMENT.md.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
