The About tab could only detect a new release and link to it; applying the
update meant SSH and scripts/update.sh. Wire that script to the UI:
- panel_update_service launches update.sh via systemd-run in its own
transient unit — a plain subprocess child would be killed when the
updater restarts the panel's own systemd unit. Status is stateless
(transient-unit state + the updater's own update-*.log) so it survives
the mid-update backend restart.
- Capability gates keep the button honest: root systemd installs only.
Docker installs get the docker compose pull instructions; dev servers
and hosts without systemd-run get a reason instead of a button.
- GET/POST /api/v1/system/update (admin_required, confirm-gated,
audited). API surface doc regenerated.
- About tab gains Update Now with inline confirm, live log tail while
the update runs, a restarting phase that tolerates the panel being
briefly unreachable, and success/rollback/timeout outcomes. New
aboutTab locale keys in en + es.
The heavy lifting (blue/green switch, migrations, health check,
automatic rollback) stays in update.sh, which is unchanged.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
