refactor(transport): convert Bi trait to use async_trait

server/crates/arbiter-useragent/Cargo.toml

@@ -18,3 +18,4 @@ thiserror.workspace = true
 tokio-stream.workspace = true
 http = "1.4.0"
 rustls-webpki = { version = "0.103.9", features = ["aws-lc-rs"] }
+async-trait.workspace = true

server/crates/arbiter-useragent/tests/auth.rs

@@ -13,12 +13,14 @@ use ed25519_dalek::SigningKey;
 use kameo::actor::Spawn;
 use tokio::sync::mpsc;
 use tokio::time::{Duration, timeout};
+use async_trait::async_trait;
 
 struct TestTransport {
     inbound_rx: mpsc::Receiver<UserAgentResponse>,
     outbound_tx: mpsc::Sender<UserAgentRequest>,
 }
 
+#[async_trait]
 impl Bi<UserAgentResponse, UserAgentRequest> for TestTransport {
     async fn send(&mut self, item: UserAgentRequest) -> Result<(), arbiter_proto::transport::Error> {
         self.outbound_tx