TubeArchivist requires nginx to serve the frontend SPA and proxy API
requests to Django. Without nginx, only API routes work.
Changes:
- Add nginx with config matching Docker's nginx.conf (port 8000)
- Add TA_APP_DIR, TA_CACHE_DIR, TA_MEDIA_DIR env vars for bare-metal paths
- Run Django migrate, collectstatic, ta_envcheck, ta_connection, ta_startup
- Add celery worker + beat scheduler as separate systemd services
- Fix interface port from 8080 to 8000 (nginx)
- Add migrations step to update script
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