__version__ not updated in 0.3.0 + Feature Request: Show version in web UI

[Niko11111]

Hi, after updating from 0.2.0 to 0.3.0 by pulling latest main and rebuilding the Docker image, the version file still reports 0.2.0:

_```
docker exec openspoolman cat version.py
version = '0.2.0'

The update itself worked fine — TRACK_LAYER_USAGE is recognized and functioning, so 0.3.0 is clearly running. The version string just wasn't bumped. I think I already had 0.3.0 installed, but it showed me 0.2.0.

**Feature Request:** It would be helpful to show the version somewhere in the web UI (e.g. in the footer). Right now the only way to verify a successful update is via the terminal, which isn't very user-friendly for Docker users.
Thanks for the great project!