feat: State→Props 命名统一 + 新增 Plug/Gateway 设备 + 分类系统重构

**命名统一（State → Props）**
- 所有设备类型：XxxState → XxxProps，GetState() → GetProps()，FetchState() → FetchProps()
- 回调接口：OnStateChanged → OnPropsChanged
- Bridge 层类型别名、示例代码、文档同步更名

**新增设备类型**
- KindPlug + Plug 驱动：智能插座/插头（TurnOn/TurnOff/IsOn/OnPropsChanged）
- KindGateway + Gateway 驱动：网关设备类型识别
- KindOccupancySensor 从 KindSensor 独立，添加 OccupancyProps

**设备分类系统改进**
- classifyByModel 改为按 key 长度降序匹配（防止 sensor 先于 sensor-occupy）
- 新增下划线变体识别（sensor_occupy、sensor_temp 等）
- outlet 重新归类为 Plug（非 Switch）
- 新增 Or() 组合过滤器

**连接桥增强**
- 设备创建成功后自动订阅属性变更
- 新增 nil 防护检查
- 支持 Plug/Speaker/Gateway/Occupancy 类型的 FetchProps 刷新
- 日志级别 Info → Debug

**AC 驱动增强**
- 新增 HasPower()、GetElectricPower()、GetPowerConsumption() 功率接口
- ACProps 新增 ElectricPower、PowerConsumption 字段
- valMapper：Desc 为空时 fallback 用 Name，key 统一小写

**MIoT 核心**
- 设备列表刷新改用 reflect.DeepEqual 全字段变更检测
- 移除 BLE/代理设备默认在线 hack
- RefreshDeviceAllProps 增加离线检查
- 新增 miot_errors.go：MIoT 错误码定义
- 全局日志级别 Info→Debug/Warn（降低噪音）

**示例与文档**
- 所有示例代码同步 API 变更
- 传感器示例改用 Or 组合过滤器
- ARCH_PLAN 等迁移文档同步更新

xiaomi/devices/factory.go

@@ -69,8 +69,10 @@ func createImpl(client *xiaomi.Client, info *xiaomi.DeviceInfo) (interface{}, er
 		ctrl, err = NewAirConditioner(client, info)
 	case matchURN(urn, "light", "lightbulb", "night-light", "ceiling-light"):
 		ctrl, err = NewLight(client, info)
-	case matchURN(urn, "switch", "outlet", "powerstrip", "toggle-switch", "wireless-switch", "curtain-switch"):
+	case matchURN(urn, "switch", "powerstrip", "toggle-switch", "wireless-switch", "curtain-switch"):
 		ctrl, err = NewSwitch(client, info)
+	case matchURN(urn, "plug", "outlet"):
+		ctrl, err = NewPlug(client, info)
 	case matchURN(urn, "fan", "ceiling-fan", "ventilator", "air-fresh", "air-purifier"):
 		ctrl, err = NewFan(client, info)
 	case matchURN(urn, "curtain", "airer-rack", "airer"):
@@ -83,12 +85,14 @@ func createImpl(client *xiaomi.Client, info *xiaomi.DeviceInfo) (interface{}, er
 		ctrl, err = NewWaterHeater(client, info)
 	case matchURN(urn, "heater", "electric-blanket", "thermostat"):
 		ctrl, err = NewThermostat(client, info)
-	case matchURN(urn, "sensor-occupy", "motion-sensor", "magnet"):
+	case matchURN(urn, "sensor-occupy", "sensor_occupy", "occupancy-sensor", "occupancy_sensor", "motion-sensor", "motion_sensor", "magnet"):
 		ctrl, err = NewOccupancySensor(client, info)
-	case matchURN(urn, "sensor-temp", "sensor-humidity", "sensor-ht", "sensor-smoke", "sensor-gasm", "illumination"):
+	case matchURN(urn, "sensor-temp", "sensor_temp", "sensor-humidity", "sensor_humidity", "sensor-ht", "sensor_ht", "sensor-smoke", "sensor-gasm", "illumination"):
 		ctrl, err = NewTempHumiditySensor(client, info)
 	case matchURN(urn, "speaker", "bluetooth-speaker", "alarm-clock", "media-player", "playback", "music"):
 		ctrl, err = NewSpeaker(client, info)
+	case matchURN(urn, "gateway"):
+		ctrl, err = NewGateway(client, info)
 	default:
 		// Not a supported device type — not an error, just returns nil
 		return nil, nil