post-completion flow: survey, referral program, review ask
- Migration 081: referral_codes, referral_uses, exit_surveys tables
- API: POST /api/v1/survey, POST /api/v1/referral/check, GET /api/v1/referral/:email
- Worker: completion_emails.py — sends completion + 24h follow-up (survey + referral)
- Survey page: /survey/?order=X&rating=N — star rating, feedback, Google review ask
- Referral: REF-FIRSTNAME codes, $25 credit per referred order, no limit
- Low ratings (1-3 stars) trigger Telegram alert for admin follow-up
- Cron: every 15 minutes
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