fix: stop recovery loops on active Gateway UI blockers

[Pigbibi]

What changed

• probes the current Gateway UI through the container instead of relying on historical logs
• stops API recovery before restart/recreate when an active login or account dialog is visible
• skips the scheduled daily restart while the same blocker remains visible
• resumes normal recovery automatically after the dialog is cleared

Verification

• python3 -m py_compile 2fa_bot.py
• bash -n scripts/detect_gateway_ui_blocker.sh scripts/recover_ib_gateway_ready.sh scripts/restart_ib_gateway_daily.sh
• bash tests/test_docker_compose_ports.sh
• bash tests/test_wait_for_ib_gateway_ready.sh
• bash tests/test_install_2fa_bot_watcher.sh
• bash tests/test_workflow_shared_config.sh

No broker order path was changed.