tgspn/cobalt ? reverse-engineered prompt

Build me a clean, self hosted version of cobalt, a simple media downloader for public content. I want a small website where someone can paste a link, hit download, and just get the file with as little friction as possible. It should feel fast, friendly, and uncluttered, with no ads, no tracking, no paywalls, and no annoying popups.

Please include both the frontend and the backend needed to make it work, plus the basic docs and config so I can run my own instance. Keep the behavior aligned with the project’s ethics, only support freely accessible public content, make it clear the user is responsible for what they download, and do not cache media on the server. Think of it more like a smart proxy than a storage service.

I’d also like sensible setup guidance, environment variables, and anything needed to protect or harden a public instance. If you need details, check the repo docs and current docs online.