- Fix deep scan with 'All bands' never scanning 5GHz: band='all' now
correctly passes --band abg to airodump-ng (previously no flag was
added, causing airodump-ng to default to 2.4GHz-only)
- Fix APs first seen without channel info permanently stuck at
band='unknown': _update_access_point now backfills channel, frequency,
and band when a subsequent observation resolves the channel
- Fix legacy /wifi/scan/start combining mutually exclusive --band and -c
flags: --band is now only added when no explicit channel list is given,
and the interface is always placed as the last argument
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>