haxshadow/free-Claude-Opus — reverse-engineered prompt

I want a really simple repo that helps someone set up Claude Code with a custom endpoint and auth token, without needing to figure it all out themselves. Make it clear that Node 18 or newer is required, install Claude Code globally, then walk people through setting the needed environment variables on Windows, Linux, and macOS so they stay saved after restart.

Please make the setup feel beginner friendly. The main goal is that a person can copy the commands for their system, add their base URL, auth token, and model name, then run claude in any project folder and be ready to use it. If it makes sense, add a small setup script or helper that asks for the values and writes them correctly for the user, but keep it simple and safe.

Also clean up the README so it is easy to follow, with clear notes about restarting the terminal if needed. You can check current Claude Code docs online if needed.