getMusicFiles ist hardcoded

[theyo-tester]

Hi and thank you for this good and simple tool!

I wanted to point out that in the case the container sits behind a reverse proxy (nginx,traefik,...) with an specific domain or subpath assigned to it, this hardcoded url doesn't work anymore:
http://localhost:3000/

This get request should be made relative to the actual uri or even absolute, but generated dynamically in code, by retrieving the actual url from the browser.

BR
theyo