plwhed/biolink ? reverse-engineered prompt

Build me an open source biolink site like guns.lol or linktree, with a polished landing page, a user dashboard, profile pages, and a nice 404 page.

I want users to be able to make their own public bio page, customize it a lot, and manage everything from a dashboard. The design should feel modern and attractive, with strong support for profile customization, social links, and simple API driven features. Use a clean dark style with good visuals and smooth effects, and make it easy to update content later. If you need to check current docs for anything, look them up online first.

Please set it up so it feels like a real product people can sign up for and use right away, with authentication, database backed user data, and room for uploads if needed. Make sure the code is organized well enough that I can extend it after the first version is working.