waSmY-2915/BACKDOOR-Reverse-Shell- ? reverse-engineered prompt

Build me a simple Python app that lets me remotely manage my own computers from a client and server setup.

I want the client to connect back to the server, stay cross platform, and let me send a few safe commands like checking system info, listing files, and uploading or downloading files I choose. Please make it easy to run from the command line, with clear prompts and helpful messages so I can tell what is happening. Add basic authentication so only approved devices can connect, and include logs for connections and commands so it is easier to debug. Keep the code clean and beginner friendly, since I want to understand how the networking works.

If you need to look up current Python networking docs or best practices online, go ahead and do that. Please keep everything in one small project with a client script and a server script, and make sure it works on Windows, macOS, and Linux.