refactor: share async invoke bridge across native platforms

ui/flutter/test/core/common/libgopeed_channel_test.dart

@@ -0,0 +1,29 @@
+import 'package:flutter/services.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:gopeed/core/common/libgopeed_channel.dart';
+
+void main() {
+  TestWidgetsFlutterBinding.ensureInitialized();
+
+  const channel = MethodChannel('gopeed.com/libgopeed');
+  final messenger = TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger;
+
+  tearDown(() {
+    messenger.setMockMethodCallHandler(channel, null);
+  });
+
+  test('mobile invokes carry unique request IDs for async callbacks', () async {
+    final requestIDs = <int>[];
+    messenger.setMockMethodCallHandler(channel, (call) async {
+      expect(call.method, 'invoke');
+      final arguments = (call.arguments as Map<Object?, Object?>).cast<String, Object?>();
+      requestIDs.add(arguments['requestID']! as int);
+      return '{"code":0}';
+    });
+
+    final bridge = LibgopeedChannel();
+    await Future.wait([bridge.invoke('GET', '/api/v1/info'), bridge.invoke('GET', '/api/v1/config')]);
+
+    expect(requestIDs, [0, 1]);
+  });
+}