Add http proxy feature.

[DimaRU]

Issue Details

Although the Trusttunnel client generally runs very smoothly and covers almost all use cases, there is one critically missing feature: HTTP/HTTPS proxy mode.

There are two basic scenarios for using the Trusttunnel client.

1. VPN mode. For mobile devices, this mode is practically the only option, especially for iOS. It is'tn ideal for desktop use, particularly when large amounts of traffic are required, such as working with Docker images, downloading Xcode/simulators, etc. It requires split tunelling, which is very time-consuming to set up.
2. Proxy mode—convenient for desktops, as it allows you to fully control which traffic goes through the tunnel. Many apps support custom proxy settings. However, not all of them support SOCKS5 proxies. One such app is Claude Code. Google Chrome does not support authentication for SOCKS5 proxies.

Proposed solution

I propose the following feature: HTTP proxy mode.
How difficult would it be to implement?

Alternative solution

Use gost

./gost -L=http://127.0.0.1:8088 -F=socks5://127.0.0.1:8080?notls=true