Fresh-DB detection on the login screen — if no super-admin row
exists, /api/v1/bootstrap/status reports needsBootstrap and login
redirects to /setup, which mints the first super-admin via
/api/v1/bootstrap/super-admin. Endpoint refuses once any user
already exists.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
