Do not automatically check for updates in metered networks

**Describe the enhancement or feature you'd like**
Use API to detect whether the current network is billing by traffic, and if so, do not automatically check for updates. However, a switch can be added to allow users to automatically check for updates under a metered network.

At the same time, I believe that when checking for updates in a metered network, users should be reminded that this may incur additional fees.

**Describe alternatives you've considered**
_None_

**Additional context**
_None_

Start by locating the existing automatic update-check entry point and the project’s update settings. Investigate the Windows API for whether the current network is metered, then define how the opt-in switch and fee warning fit the existing settings and update flow. Done means automatic checks are skipped by default on metered networks, with a user-controlled override and a reminder when checks proceed.

Written by the indexing model from the issue text.