trunghieut953-alt/bt-b2-linuxsever ? reverse-engineered prompt

Build me a simple MERN demo project that I can run on a Linux server, with a clean setup for local development and deployment. I want the app to have a basic frontend and backend that talk to each other, plus a MongoDB database, and I want it to be easy to start with Docker Compose.

Please make it so I can spin everything up with one command, and include clear setup instructions for running it on a server and from my local machine. If there are any permission or file access issues that matter on Linux, handle them in a practical way or show me how to fix them. Keep the app small and understandable, but make sure it feels like a real example of deploying a MERN app.

If you need to check current docs or best practices for anything, look them up online.