magnusmanske/mixnmatch_rs ? reverse-engineered prompt

Build me a Rust web app for a Wikidata helper tool like Mix n Match, with a background task server, a web server, and a simple HTML and JavaScript interface.

It should let me manage catalogs, import and update them from MetaEntry JSON, and expose the basic pages and API needed to work with those catalogs. I want it to feel like a practical internal tool, something that can run jobs in the background, serve a browser UI, and connect to a database cleanly. Please also include the pieces needed for local setup and deployment, plus a way to configure the app from a template config file.

If there are any current docs or best practices that would help, look them up online and follow them. Make the interface straightforward and usable, not fancy, and keep the project organized so it is easy to run, test, and maintain.