Convert socks5.rs to directory module with protocol parsing and server
implementation. Socks5Server binds to configurable address (default
127.0.0.1:1080), handles SOCKS5 handshake (no-auth), parses IPv4/IPv6/domain
addresses, and proxies bidirectionally via SSH direct_tcpip channels.
Domain names sent unresolved (SOCKS5h) to prevent DNS leaks (ADR-006).
No logging of request targets per privacy requirements.
glm-5.1
2efd4cf7c5