{"stun_servers":[{"url":"stun:stun.cloudflare.com:3478","name":"Cloudflare","note":"国内可达，CF 公共服务","priority":1},{"url":"stun:stun.l.google.com:19302","name":"Google","note":"国外用户优先，国内常被墙","priority":2},{"url":"stun:stun.nextcloud.com:443","name":"Nextcloud","note":"443 端口可穿透部分防火墙","priority":3}],"candidate_types":{"host":{"label":"本地","risk":"low","desc":"设备网卡 IP，现代浏览器通常会做隐私保护"},"srflx":{"label":"公网（STUN）","risk":"high","desc":"经 STUN 探测到的当前公网出口 IP，可能绕过部分代理策略暴露网络出口"},"prflx":{"label":"对等中继","risk":"medium","desc":"通过其它 peer 反射，少见"},"relay":{"label":"中继","risk":"low","desc":"经 TURN 中继，未暴露真实 IP"}}}