feat: import Chinese-localized Buzz source snapshot

Signed-off-by: cls_宁波本机 <908705107@qq.com>

crates/buzz-pair-relay/Cargo.toml

@@ -0,0 +1,35 @@
+[package]
+name        = "buzz-pair-relay"
+description = "Ephemeral sidecar relay for NIP-AB device pairing handshakes"
+version.workspace     = true
+edition.workspace     = true
+rust-version.workspace = true
+license.workspace     = true
+repository.workspace  = true
+
+[lib]
+name = "buzz_pair_relay"
+path = "src/lib.rs"
+
+[[bin]]
+name = "buzz-pair-relay"
+path = "src/main.rs"
+
+[dependencies]
+tokio            = { workspace = true, features = ["rt-multi-thread", "macros", "net", "time", "sync"] }
+tokio-tungstenite = { workspace = true }
+serde_json       = { workspace = true }
+futures-util     = { workspace = true }
+tokio-util       = { workspace = true }
+parking_lot      = "0.12"
+hyper            = { version = "1", features = ["server", "http1"] }
+hyper-util       = { version = "0.1", features = ["tokio"] }
+http-body-util   = "0.1"
+secp256k1        = { version = "0.31", features = ["global-context"] }
+sha2             = "0.11"
+
+[dev-dependencies]
+tokio            = { workspace = true, features = ["test-util"] }
+tokio-tungstenite = { workspace = true }
+secp256k1        = { version = "0.31", features = ["global-context", "rand", "std"] }
+sha2             = "0.11"

crates/buzz-pair-relay/src/main.rs

@@ -0,0 +1,27 @@
+use std::net::SocketAddr;
+use std::sync::Arc;
+
+use buzz_pair_relay::{run_server, Relay};
+use tokio::net::TcpListener;
+
+#[tokio::main]
+async fn main() {
+    let addr_raw =
+        std::env::var("BUZZ_PAIR_RELAY_BIND_ADDR").unwrap_or_else(|_| "127.0.0.1:5000".to_string());
+    let addr: SocketAddr = match addr_raw.parse() {
+        Ok(addr) => addr,
+        Err(e) => {
+            eprintln!("fatal: invalid BUZZ_PAIR_RELAY_BIND_ADDR {addr_raw:?}: {e}");
+            std::process::exit(1);
+        }
+    };
+    let listener = match TcpListener::bind(addr).await {
+        Ok(l) => l,
+        Err(e) => {
+            eprintln!("fatal: failed to bind {addr}: {e}");
+            std::process::exit(1);
+        }
+    };
+    let relay = Arc::new(Relay::new());
+    run_server(listener, relay).await;
+}