fix: address unimplemented/broken issues across server and desktop

desktop/test/e2e_ws_test.dart

@@ -2,18 +2,22 @@
 //
 // 运行前需先启动 Rust 服务端：cd .. && cargo run
 // 运行：flutter test test/e2e_ws_test.dart
-import 'dart:io';
-
 import 'package:flutter_test/flutter_test.dart';
 import 'package:xterm/xterm.dart';
 
-import '../lib/src/rtty_client.dart';
+import 'package:rtty_desktop/src/rtty_client.dart';
+
+import 'support.dart';
 
 void main() {
   TestWidgetsFlutterBinding.ensureInitialized();
 
   test('RttyClient connects to Rust server and renders command output',
       () async {
+    if (!await isServerUp('127.0.0.1', 8080)) {
+      markTestSkipped('Rtty server not running');
+      return;
+    }
     final terminal = Terminal();
     final client = RttyClient(terminal);