Live ingestion setup

NurseJet is running in demo mode (no Supabase). Live ingestion needs a database to write to. To enable it:

1. Create a Supabase project and add the env vars to .env.local.
2. Apply supabase/migrations/0001 → 0003 in the SQL editor.
3. Set ADMIN_EMAILS and sign in to become an admin.
4. (Optional) Add NCBI_EMAIL, ANTHROPIC_API_KEY, CRON_SECRET.

Research adapters (PubMed, Europe PMC, OpenAlex, Crossref) need no API key.