New Project: create-shopify-firebase-app

从提交的 .opensource/project.json 开始，并结合 config/additional_projects.json 阅读 docs/configure-repo.md，以核实当前的项目注册工作流。确认正确的 registry 位置和贡献者指南，然后确保站点能够处理 create-shopify-firebase-app 条目，而不依赖已废弃的 additional-projects.json 路径。

GitHub link: https://github.com/mksd0398/create-shopify-firebase-app

What it is (2-3 sentences):
An MIT-licensed CLI that scaffolds an embedded Shopify app running entirely on Firebase — Hosting for the frontend, gen-2 Cloud Functions for OAuth, the Admin API, webhooks and the storefront app proxy, and Firestore for session storage. One command takes you from nothing to a deployed, installable Shopify app, including creating and provisioning the Firebase project. It is positioned as the Firebase alternative to Shopify official Remix/React Router template, which assumes a Node server plus Postgres.

Why would Firebase developers be interested?
Shopify app development is a sizeable ecosystem whose official tooling assumes a long-running Node server and a relational database, so Firebase is not an obvious path and there is little material showing how to do it well. This project is a worked example of the serverless equivalent: session-token (JWT) verification on gen-2 Functions, Firestore as the OAuth session store with deny-all rules since access is admin-SDK only, HMAC verification for webhooks and app proxy, and Hosting rewrites mapping clean paths onto individual functions. It also makes a concrete cost argument for Firebase — the free tier covers a meaningful number of installed merchants before Blaze usage begins.

Have you added .opensource/project.json?
Yes — added at .opensource/project.json with platforms: ["Web"].

Note on the setup docs: docs/configure-repo.md currently instructs contributors to add their repo to additional-projects.json, but that file no longer exists in this repository — the live registry appears to be config/additional_projects.json. Happy to open a PR against whichever is correct if that is preferred over an issue.