alchemy-fr/Phraseanet ? reverse-engineered prompt

Build me a digital asset management web app for photos, videos, and documents. I want users to be able to upload files, search them quickly, add and edit metadata, organize them with tags or a thesaurus, and generate different sizes of the same asset for preview and download. Please include separate areas for regular users and admins, plus a lightbox or saved selection area, reports, and a simple approval workflow for collaborative review.

It should support strong permissions, duplicate detection, and sign in through SSO if possible. I also want a REST API so other tools can connect to it, and a clean way to plug in extras later. If there’s a sensible way to run it with Docker for local setup, do that too, and make the default launch easy so I can open it in the browser and test it right away. Look up current docs online if you need to.