819889684f
按 docs/下位机交互数据模型.md 重构串口协议层： 协议层 - 新增 DeviceMessage 模型，对应 message_id/type/ack/need_ack/data - 新增 JsonProtocolService，4 字节大端长度前缀 + UTF-8 JSON 帧 - 删除原二进制协议（serial_protocol.dart） 服务层 - 新增 DeviceMessageService，集中收发并按 type 分发 - 重写 SerialRunner 为 JsonSerialRunner，使用 create_task/control 消息 数据模型 - DeviceState 增加 doorStatus/lightStatus/taskStatus/lastInfoAt - 新增 DeviceInfoNotifier 订阅 device_info 上行 - 灯光按钮接通 light_control 消息 测试 - 新增 device_protocol_test.dart（14 用例） - 修复 models_test.dart 残留的 Step mixSpeed/blowSpeed 错误
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