net/tun2socks: New port: Tunnel TCP/UDP traffic through a SOCKS5/HTTP proxy via TUN interface

tun2socks creates a TUN network interface that tunnels TCP and UDP
traffic through a SOCKS5, HTTP, Shadowsocks, or Relay proxy. It is
powered by gVisor's userspace TCP/IP stack and supports gateway mode
for transparent proxying of other devices on the network.

Features include IPv4/IPv6 support, multiple proxy protocols with
authentication, a REST API for runtime statistics, and cross-platform
compatibility with Linux, macOS, FreeBSD, OpenBSD, and Windows.

WWW: https://github.com/xjasonlyu/tun2socks
Submitted by: Dasun Nimantha Perera <dasun4@pm.me>
PR: 294135
MFH: 2026Q2

(cherry picked from commit 66277d2e719a210080b23b797cf2a08cd3c6c0b8)