glm-5.1
24b92227e7
Implement ServerHandler with auth delegation and channel dispatch
Convert server.rs to directory module (server/mod.rs + server/handler.rs).
ServerHandler implements russh::server::Handler with:
- auth_publickey() delegating to ServerAuthConfig with structured logging
- channel_open_direct_tcpip() routing wraith-* prefix to internal handler,
stub for regular TCP proxy
- ProxyConfig/ProxyMode types for outbound proxy configuration
- Unit tests for auth delegation, reserved destination routing, and
unknown channel type rejection