Tests site availability and download speed through different egw/ogw
gateways via their SOCKS5 proxies. Uses eget --check-url and --speedtest.
Default sites: instagram.com, facebook.com, youtube.com, rutracker.org,
flibusta.is. Gateway list is easily extensible.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>