2f7e5db456
The startup warning 'No user allowlists configured' only checked GATEWAY_ALLOW_ALL_USERS and per-platform _ALLOWED_USERS vars. It missed SIGNAL_GROUP_ALLOWED_USERS and per-platform _ALLOW_ALL_USERS vars (e.g. TELEGRAM_ALLOW_ALL_USERS), causing a false warning even when users had these configured. The actual auth check in _is_user_authorized already recognized these vars. Cherry-picked from PR #3202 by binhnt92.