tanzil8/AI-code-review-backend ? reverse-engineered prompt

Build me the backend for an AI powered code review app.

I want a simple API that lets a user send in code, gets an AI review back, and returns clear feedback like bugs, improvements, and best practices in plain English. Set up the server so it is easy to connect to a frontend later, and make sure the main routes are clean and ready to use. If it makes sense, include basic handling for saving review requests and results, plus environment variables for things like API keys.

Please keep it practical and working end to end, with good error handling and a straightforward project structure. If you need current setup details for any libraries or API usage, look them up online first.