frp 使用 p2p 模式，点对点穿透，节约服务器带宽
https://zsxwz.com/2023/10/03/frp-%e4%bd%bf%e7%94%a8-p2p-%e6%a8%a1%e5%bc%8f%ef%bc%8c%e7%82%b9%e5%af%b9%e7%82%b9%e7%a9%bf%e9%80%8f%ef%bc%8c%e8%8a%82%e7%ba%a6%e6%9c%8d%e5%8a%a1%e5%99%a8%e5%b8%a6%e5%ae%bd/