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Implements a book order system with a Vite React storefront (React Router, TanStack Query) and an Express + Prisma + SQLite API: default pay-by-transfer flow with admin-reviewed payment proof, Cloudflare Turnstile on order submit, honeypot field, payment-proof upload with duplicate-image detection, 8-character receipt codes plus opaque magic links, optional order kill-switch, minimal admin (single shared password, in-memory session tokens), and gated downloads via private object storage with short-lived signed URLs (never long-lived public book URLs). Use when building similar book sales, receipt-code access, or this two-service architecture; payment automation or gateways can replace or augment the default review step when the user requests it.