feat: 修复了插件需要外部Provider的问题；加上了一个简易的车控状态返回

lib/screens/part_screen.dart

@@ -57,10 +57,16 @@ class _PartScreenState extends State<PartScreen> {
   }
 
   void _openFullScreen() async {
+    final messageService = context.read<MessageService>();
+
     widget.onHide?.call();
+
     await Navigator.of(context).push(
       MaterialPageRoute(
-        builder: (context) => const FullScreen(),
+        builder: (context) => ChangeNotifierProvider.value(
+          value: messageService, // 传递同一个单例实例
+          child: const FullScreen(),
+        ),
       ),
     );
   }