arifulislamctg11/erpnext-saas_backend ? reverse-engineered prompt

Build me a TypeScript backend for a SaaS app that can serve API requests cleanly and be easy to extend later.

I want a simple server setup with separate places for routes, services, helpers, and utility code, so the project stays organized as it grows. It should run locally, handle JSON requests, and be ready to deploy on Vercel. Please wire up a basic server entry point, a few example routes, and a clean structure for adding business logic in services instead of keeping everything in the route handlers.

Make sure the code is easy to read, uses sensible defaults, and includes whatever configuration is needed for TypeScript and deployment. If anything important is unclear, use current docs online and fill in the blanks in a practical way.