No support for Media Fragment URI

Unfortunately, `http://localhost:3000/videos/my_video.mp4#t=30` serves the video, but does not start at 30 seconds. I have confirmed that on another webserver with the same browser that this query works per [W3C spec](https://www.w3.org/TR/media-frags/)

The issue names no repository files or tests; start by tracing how the static file server handles the requested URL `http://localhost:3000/videos/my_video.mp4#t=30` and compare that behavior with the linked W3C Media Fragments specification. Done means the served video starts at 30 seconds in a browser that supports the fragment.

Written by the indexing model from the issue text.