Add Stripe connector: POST /v1/connect/stripe — paste read-only key, auto-score customers from billing data

Add /v1/predict/csv — upload a CSV instead of hand-building JSON (kills data-assembly friction)

Restore RapidAPI proxy-secret validation (constant-time, dormant when unset)

Unify health routes: /, /_health, /v1/health all return uptime

Deploy RevAI API