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/models/vehicle_cmd.dart

@@ -1,11 +1,15 @@
 import '../enums/vehicle_command_type.dart';
 
+/// 车辆控制命令类
 class VehicleCommand {
   final VehicleCommandType type;
   final Map<String, dynamic>? params;
   final String error;
+  late String commandId;
 
-  VehicleCommand({required this.type, this.params, this.error = ''});
+  VehicleCommand({required this.type, this.params, this.error = ''}) {
+    commandId = DateTime.now().millisecondsSinceEpoch.toString();
+  }
 
   // 从字符串创建命令（用于从API响应解析）
   factory VehicleCommand.fromString(