reactioncommerce/reaction ? reverse-engineered prompt

Build me a headless ecommerce platform that I can run locally with a simple setup, with an API, an admin area, and a storefront. It should let me manage products with variants, inventory, orders, shipping, taxes, fulfillment, and email confirmations, and it should support multiple shops in one installation.

I want it to be easy to develop on, with a local MongoDB setup and a Docker based option too. Make the codebase feel modular so it would be easy to add custom plugins later. The admin should let me view and manage orders, and the storefront should work cleanly with the API.

If anything is unclear, check the current docs online and follow the existing project style. Also make sure the app is ready for a realistic commerce workflow, not just a demo.