Help with custom api widgets

### Description

what is the setup needed to add environment variables in the glance.yml. For example, I already have qbittorrent.yml then include it under "widgets:" in glance.yml but I still get the error "2026/04/14 18:21:16 Config has errors: parsing variable: environment variable QBITTORRENT_IP not found"

Start with the referenced glance.yml and qbittorrent.yml files, and review how custom widgets and environment variables are documented. Confirm the expected setup for including the widget and supplying QBITTORRENT_IP, then document the required steps and error resolution clearly.

Written by the indexing model from the issue text.