clippy all codes (#1214)

1. clippy code
2. add fmt and clippy check in ci

easytier-web/src/main.rs

@@ -151,7 +151,7 @@ async fn get_dual_stack_listener(
     } else {
         None
     };
-    let v4_listener = if let Ok(_) = local_ipv4().await {
+    let v4_listener = if local_ipv4().await.is_ok() {
         get_listener_by_url(&format!("{}://0.0.0.0:{}", protocol, port).parse().unwrap()).ok()
     } else {
         None