korrakiran/Vyapaar_Backend — reverse-engineered prompt

Build me a working Python backend for a small business app called Vyapaar. Right now the repo only has a basic structure, so please turn it into something I can run locally and connect a frontend to.

I want a clean API with a health check, sensible config loading, organized core logic, useful error responses, and simple example endpoints for the main business data so I can extend it later. Keep it lightweight and easy to understand, not enterprise style.

Add any missing setup needed in requirements, make main.py start the server, and make api.py expose the routes clearly. Include basic validation, logging, and a short README that explains how to install, run, and test the backend. If you need to choose defaults, choose the simplest option and look up current docs online if needed.