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/temp_humidity_sensor.go

@@ -13,16 +13,16 @@ type TempHumiditySensor interface {
 	GetTemperature(ctx context.Context) (float64, error)
 	GetHumidity(ctx context.Context) (float64, error)
 
-	OnStateChanged(handler func(temp, humidity float64)) (string, error)
-	GetState() (float64, float64)
-	FetchState(ctx context.Context) (float64, float64, error)
+	OnPropsChanged(handler func(temp, humidity float64)) (string, error)
+	GetProps() (float64, float64)
+	FetchProps(ctx context.Context) (float64, float64, error)
 }
 
 type tempHumidityDevice struct {
 	BaseDevice
 	propTemp     siidPiid
 	propHumidity siidPiid
-	stateCache   [2]float64 // [0]=temperature, [1]=humidity
+	propsCache   [2]float64 // [0]=temperature, [1]=humidity
 }
 
 func NewTempHumiditySensor(client *xiaomi.Client, info *xiaomi.DeviceInfo) (TempHumiditySensor, error) {
@@ -61,33 +61,33 @@ func (d *tempHumidityDevice) GetHumidity(ctx context.Context) (float64, error) {
 	return toFloat(prop.Value), nil
 }
 
-func (d *tempHumidityDevice) OnStateChanged(handler func(temp, humidity float64)) (string, error) {
+func (d *tempHumidityDevice) OnPropsChanged(handler func(temp, humidity float64)) (string, error) {
 	if !d.propTemp.valid && !d.propHumidity.valid { return "", xiaomi.ErrNotSupported }
 	return d.SubProp(0, 0, func(did string, prop *xiaomi.PropertyValue) {
 		switch {
 		case d.propTemp.valid && prop.SIID == d.propTemp.siid && prop.PIID == d.propTemp.piid:
-			d.stateCache[0] = toFloat(prop.Value)
+			d.propsCache[0] = toFloat(prop.Value)
 		case d.propHumidity.valid && prop.SIID == d.propHumidity.siid && prop.PIID == d.propHumidity.piid:
-			d.stateCache[1] = toFloat(prop.Value)
+			d.propsCache[1] = toFloat(prop.Value)
 		}
-		handler(d.stateCache[0], d.stateCache[1])
+		handler(d.propsCache[0], d.propsCache[1])
 	})
 }
 
-func (d *tempHumidityDevice) GetState() (float64, float64) { return d.stateCache[0], d.stateCache[1] }
-func (d *tempHumidityDevice) FetchState(ctx context.Context) (float64, float64, error) {
+func (d *tempHumidityDevice) GetProps() (float64, float64) { return d.propsCache[0], d.propsCache[1] }
+func (d *tempHumidityDevice) FetchProps(ctx context.Context) (float64, float64, error) {
 	keys := []xiaomi.PropKey{}
 	if d.propTemp.valid { keys = append(keys, xiaomi.PropKey{DID: d.info.DID, SIID: d.propTemp.siid, PIID: d.propTemp.piid}) }
 	if d.propHumidity.valid { keys = append(keys, xiaomi.PropKey{DID: d.info.DID, SIID: d.propHumidity.siid, PIID: d.propHumidity.piid}) }
 	props, err := d.client.GetProps(ctx, keys)
-	if err != nil { return d.stateCache[0], d.stateCache[1], err }
-	state := [2]float64{d.stateCache[0], d.stateCache[1]}
+	if err != nil { return d.propsCache[0], d.propsCache[1], err }
+	state := [2]float64{d.propsCache[0], d.propsCache[1]}
 	for _, p := range props {
 		switch {
 		case d.propTemp.valid && p.SIID == d.propTemp.siid && p.PIID == d.propTemp.piid: state[0] = toFloat(p.Value)
 		case d.propHumidity.valid && p.SIID == d.propHumidity.siid && p.PIID == d.propHumidity.piid: state[1] = toFloat(p.Value)
 		}
 	}
-	d.stateCache = state
+	d.propsCache = state
 	return state[0], state[1], nil
 }