feat(rustproxy): introduce a Rust-powered proxy engine and workspace with core crates for proxy functionality, ACME/TLS support, passthrough and HTTP proxies, metrics, nftables integration, routing/security, management IPC, tests, and README updates

rust/crates/rustproxy-passthrough/src/lib.rs

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+//! # rustproxy-passthrough
+//!
+//! Raw TCP/SNI passthrough engine for RustProxy.
+//! Handles TCP listening, TLS ClientHello SNI extraction, and bidirectional forwarding.
+
+pub mod tcp_listener;
+pub mod sni_parser;
+pub mod forwarder;
+pub mod proxy_protocol;
+pub mod tls_handler;
+pub mod connection_record;
+pub mod connection_tracker;
+pub mod socket_relay;
+
+pub use tcp_listener::*;
+pub use sni_parser::*;
+pub use forwarder::*;
+pub use proxy_protocol::*;
+pub use tls_handler::*;
+pub use connection_record::*;
+pub use connection_tracker::*;
+pub use socket_relay::*;