refactor(jwt): gate signing-key auto-rotation cron on SIGNING_KEY_ROTATION_DAYS (#20866)
Only register the JWT signing-key rotation cron when `SIGNING_KEY_ROTATION_DAYS` is set, and move that variable to Advanced Settings.
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@@ -16,10 +16,9 @@ Each key carries a `publicKey` (kept indefinitely so it can verify previously is
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### Rotate the current key
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- **Manual** — **Settings → Admin Panel → Signing keys → Revoke** on the current row. Revoking wipes its encrypted private material and demotes it; the next sign call automatically mints a fresh ES256 keypair as the new current. Tokens signed under any other (non-revoked) `kid` keep verifying until they expire.
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- **Enterprise (automatic)** — a daily cron (`'15 3 * * *'` UTC) issues a new current key once the existing one has been current for `SIGNING_KEY_ROTATION_DAYS` (default `90`). The previous key is *not* revoked, so tokens signed under it keep verifying. Register it once with `yarn command:prod cron:register:all`.
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Set `SIGNING_KEY_ROTATION_DAYS` to opt in: a daily cron then issues a new current key once the existing one is older than that threshold. Previous keys are *not* revoked, so tokens signed under them keep verifying. Leave the variable unset to disable auto-rotation.
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<Note>The Enterprise cron and `SIGNING_KEY_ROTATION_DAYS` ship in v2.6+.</Note>
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<Note>Auto-rotation ships in v2.6+.</Note>
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### Revoke a key (leak / emergency only)
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