The update check read the newest release tag from local .git, which the
production Docker image does not contain — so 'check for updates' always
reported 'no release tagged' in prod even when a newer version existed. It now
queries the public, read-only Gitea tags API (anonymous; no token leaves the
panel), keeps local .git only as a dev fallback, and caches the result so a
page render never makes a network call (only the explicit action does).
Channel-aware (stable = vX.Y.Z only; beta also sees prereleases) and degrades
silently when the host is unreachable.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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