Folds in the v1.4.6 deferred backlog item:
* `GET /api/admin/backups` — returns metadata-only listing of every
DataBackup row (size in bytes, no payload). Encrypted blobs stay
server-side.
* `POST /api/admin/backups/run` — enqueues an ad-hoc data-backup
pg-boss job. Returns 503 if the worker isn't running; the existing
weekly cron schedule is unchanged.
* `<BackupsSection>` — admin route at /admin/backups with the rows
table + "Backup now" CTA.
No new dependencies; uses the global pg-boss instance already wired in
`src/lib/jobs/boss-instance.ts`.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
