Cold Start Safe Architecture

Act as a Senior Expo + Supabase Architect. Implement a cold-start safe architecture using: - Expo (React Native) client - Supabase Postgres + Storage + Realtime - Supabase Edge Functions ONLY for lightweight gating + job enqueue - A separate Worker service for heavy AI generation and storage writes Deliver: 1) Database schema (SQL migrations) for: jobs, generations, entitlements (credits/is_paid), including indexes and RLS notes 2) Edge Functions: - ping (HEAD/GET) - enqueue_generation (validate