Sellfy?

Build a focused replacement for Sellfy for one creator selling a small digital catalog, based on this public product description: “Online Store Builder: Create a Free Online Store | Sellfy — Create your own online store with a clean checkout and zero transaction fees. Sell anything you make directly to your audience. No coding required.” Do not copy the original brand, proprietary assets, name, logo, UI, or copy; create an original visual system.

Core workflow
- Recreate only the narrow primary workflow described above, with manage products, prices, availability, and a public storefront; provide a checkout boundary or mock payment adapter; show order state, receipt, and basic export; make taxes, refunds, and payment-provider limitations explicit.
- Keep the product name and source description in a research note in the README, and turn every uncertain behavior into an explicit assumption or user setting rather than inventing a feature.
- Use a small React/TypeScript app with a portable JSON or SQLite data model, clear loading/empty/error states, and adapters around external services. Seed realistic demo data so the complete workflow works without paid credentials.

Scope boundaries
- Out of scope for v1: payment processing without a provider; marketplace discovery; full commerce operations. Do not promise feature parity, proprietary data, or enterprise reliability.

Include a README with setup, environment variables, data model, implementation decisions, privacy behavior, testing instructions, and important limitations.