CVE-2026-58510: Gitea: GHSA-8fwc-qjw5-rvgp ClearRepoWatches fix not applied to API EditRepo path — sister code path retains stale watches on public->private

GHSA-8fwc-qjw5-rvgp (“Gitea may send release notification emails for private repositories to users whose access has been revoked”, fix in PR #36319 / commit 8a98ac22) added repo_model.ClearRepoWatches as a defense for the state transition public→private. The cleanup was wired into services/repository/repository.go::MakeRepoPrivate only. The sister helper services/repository/repository.go::updateRepository — which is the function used by the API path PATCH /api/v1/repos/{owner}/{repo} — was not patched and still calls ClearRepoStars only.

As a result, when a public repository is flipped to private via the REST API (rather than via the web Settings → Danger Zone UI), the watch records persist. Affected users can:

• See the now-private repository in GET /api/v1/user/subscriptions?private=true along with its full Repository JSON (description, default branch, language, fork status, counts, mirror metadata, license list, etc.) — even though they have no access to the repository.
• Have their stale watch records re-leak content through any future notification path that does not include the send-time CheckRepoUnitUser check that was added to services/mailer/mail_release.go.
• Inflate the visible NumWatches counter on the repository.