新增: df-relay binary 入口(main.rs axum WS Server :8080)

Phase3 联调链补 relay 启动入口:src/main.rs 调 DefaultRelayServer::start(listen 0.0.0.0:8080,DF_RELAY_ADDR env 覆盖)+ tracing-subscriber 日志。cargo run -p df-relay 启动,提供 /ws/device + /ws/miniapp 端点。cargo check EXIT=0。

crates/df-relay/Cargo.toml

@@ -12,6 +12,8 @@ async-trait = { workspace = true }
 thiserror = { workspace = true }
 anyhow = { workspace = true }
 tracing = { workspace = true }
+# binary 入口(main.rs)日志初始化
+tracing-subscriber = { version = "0.3", features = ["env-filter"] }
 
 # HTTP + WS 服务端
 axum = { version = "0.7", features = ["ws"] }

crates/df-relay/src/main.rs

@@ -0,0 +1,21 @@
+//! df-relay binary 入口 — 启动跨端 AI Chat 云中继 axum WS Server。
+//!
+//! 监听 `0.0.0.0:8080`(`DF_RELAY_ADDR` env 覆盖),提供两个 WS 端点:
+//! - `/ws/device`:桌面端 df-tunnel 连入(Hello device 鉴权)
+//! - `/ws/miniapp`:小程序连入(按 device_id 配对路由)
+//!
+//! 纯转发中继,无业务逻辑。token 校验对齐 `DEFAULT_TOKEN`(relay.rs,可 `DF_RELAY_TOKEN` env 覆盖)。
+//!
+//! 联调启动:`cargo run -p df-relay`(或 `DF_RELAY_ADDR=0.0.0.0:8080 cargo run -p df-relay`)。
+
+use df_relay::{DefaultRelayServer, RelayServer};
+
+#[tokio::main]
+async fn main() -> df_relay::Result<()> {
+    tracing_subscriber::fmt::init();
+    // 监听地址:env 覆盖,默认 0.0.0.0:8080(对齐 df-miniapp config.ts relayHost + df-tunnel src-tauri 集成)。
+    let addr = std::env::var("DF_RELAY_ADDR").unwrap_or_else(|_| "0.0.0.0:8080".to_string());
+    tracing::info!(%addr, "[df-relay] 启动跨端中继 axum WS Server(/ws/device + /ws/miniapp)");
+    let server = DefaultRelayServer::new();
+    server.start(&addr).await
+}