Module network_check

Network connectivity verification for distro downloader

ARCHITECTURE CHANGE: Network initialization now happens post-ExitBootServices. This module is DEPRECATED - network check is no longer done during UEFI phase.

The new flow is:

1. User browses catalog (no network needed - static data)
2. User selects ISO and confirms download
3. ExitBootServices is called
4. Bare-metal network stack initializes (VirtIO + smoltcp)
5. Download proceeds in bare-metal mode

This check function now always succeeds since network isn’t initialized yet.

Functions

• check_network_connectivityDeprecated
  Check network connectivity (DEPRECATED - always succeeds)