Add setupRedirectMiddleware that checks the setup_complete system
setting on every request. If setup is incomplete, all non-setup
requests are redirected to /setup so the wizard is the first thing
new users see. The check uses an in-memory cache (10s TTL) to avoid
hitting the database on every request, with cache invalidation on
setup completion.
The middleware skips /setup, /api/*, /static/*, /health, and
/favicon.ico so the wizard page, API calls, and static assets load
normally during setup.
Register two new routes:
- GET /setup: renders the setup wizard SSR template
- PUT /api/setup/complete: marks setup as complete (JWT-protected,
requires an authenticated admin user created in step 1)