manyfold3d/manyfold ? reverse-engineered prompt

Build me a self hosted web app for managing a library of 3D print files.

I want it to let me upload and organize model files, browse my collection in the browser, and see useful previews instead of just filenames. It should feel good for 3D printing people, so files like STL and OBJ should be handled well, with thumbnails or simple 3D viewing where possible, and some background processing for things that take a while like file analysis or image generation.

Make it work as a normal server rendered app that I can run locally or deploy myself, with a simple setup path and sensible defaults. I’d also like it to be ready for user accounts, search, and admin style management of the library. If federation or sharing is already part of the project, keep that in mind too, but don’t overcomplicate it.

Use the project’s existing stack and conventions, and look up current docs online if you need to. Please make it feel polished and usable, not like a rough prototype.