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

miot/miot_client_prop.go

@@ -21,6 +21,9 @@ func (c *MIoTClient) RefreshDeviceAllProps(did string) error {
 	if !exists {
 		return fmt.Errorf("device %s not found in cache", did)
 	}
+	if !getOnline(info) {
+		return fmt.Errorf("device %s is offline", did)
+	}
 
 	device := c.getOrCreateDevice(did, info)
 	if device == nil {
@@ -41,7 +44,7 @@ func (c *MIoTClient) RefreshDeviceAllProps(did string) error {
 		}
 	}
 
-	c.lgr.Infof("[MIoTClient] RefreshDeviceAllProps: %s → %d props enqueued\n", did, count)
+	c.lgr.Debugf("[MIoTClient] RefreshDeviceAllProps: %s → %d props enqueued\n", did, count)
 	return nil
 }
 
@@ -59,7 +62,7 @@ func (c *MIoTClient) RequestRefreshProp(did string, siid, piid int) {
 
 	// Check if already in refresh list
 	if _, exists := c.refreshPropsList[key]; exists {
-		c.lgr.Infof("[MIoTClient] RequestRefreshProp: SKIPPED (already queued) %s\n", key)
+		c.lgr.Debugf("[MIoTClient] RequestRefreshProp: SKIPPED (already queued) %s\n", key)
 		return
 	}
 
@@ -71,7 +74,7 @@ func (c *MIoTClient) RequestRefreshProp(did string, siid, piid int) {
 
 	// Schedule refresh if not already scheduled
 	if c.refreshPropsTimer == nil {
-		c.lgr.Infof("[MIoTClient] RequestRefreshProp: Scheduling refresh timer for %s\n", key)
+		c.lgr.Debugf("[MIoTClient] RequestRefreshProp: Scheduling refresh timer for %s\n", key)
 		// Reset retry count for new batch
 		c.refreshRetryCount = 0
 
@@ -80,14 +83,14 @@ func (c *MIoTClient) RequestRefreshProp(did string, siid, piid int) {
 			c.refreshPropsTimer = nil
 			c.mu.Unlock()
 
-			c.lgr.Infof("[MIoTClient] RequestRefreshProp: Timer fired, calling refreshPropsHandler()\n")
+			c.lgr.Debugf("[MIoTClient] RequestRefreshProp: Timer fired, calling refreshPropsHandler()\n")
 			c.refreshPropsHandler()
 		})
 	} else {
-		c.lgr.Infof("[MIoTClient] RequestRefreshProp: Timer already scheduled, added to queue: %s\n", key)
+		c.lgr.Debugf("[MIoTClient] RequestRefreshProp: Timer already scheduled, added to queue: %s\n", key)
 	}
 
-	c.lgr.Infof("[MIoTClient] RequestRefreshProp: QUEUED %s (queue size: %d)\n", key, len(c.refreshPropsList))
+	c.lgr.Debugf("[MIoTClient] RequestRefreshProp: QUEUED %s (queue size: %d)\n", key, len(c.refreshPropsList))
 }
 
 // refreshPropsHandler handles property refresh from cloud.
@@ -107,7 +110,7 @@ func (c *MIoTClient) refreshPropsHandler() {
 	c.refreshPropsList = make(map[string]map[string]interface{})
 	c.mu.Unlock()
 
-	c.lgr.Infof("[MIoTClient] refreshPropsHandler: START, %d props to refresh\n", len(propsToRefresh))
+	c.lgr.Debugf("[MIoTClient] refreshPropsHandler: START, %d props to refresh\n", len(propsToRefresh))
 
 	// Group props by source (cloud / gateway / lan)
 	cloudParams := make([]PropParam, 0)
@@ -192,7 +195,7 @@ func (c *MIoTClient) refreshPropsHandler() {
 				return
 			}
 			allResults = append(allResults, results...)
-			c.lgr.Infof("[MIoTClient] refreshPropsHandler: cloud batch %d returned %d results\n", i/150+1, len(results))
+			c.lgr.Debugf("[MIoTClient] refreshPropsHandler: cloud batch %d returned %d results\n", i/150+1, len(results))
 		}
 	}
 
@@ -223,7 +226,7 @@ func (c *MIoTClient) refreshPropsHandler() {
 			continue
 		}
 		allResults = append(allResults, results...)
-		c.lgr.Infof("[MIoTClient] refreshPropsHandler: gateway %s returned %d results\n", groupID, len(results))
+		c.lgr.Debugf("[MIoTClient] refreshPropsHandler: gateway %s returned %d results\n", groupID, len(results))
 	}
 
 	// LAN source
@@ -242,7 +245,7 @@ func (c *MIoTClient) refreshPropsHandler() {
 				}
 			} else {
 				allResults = append(allResults, results...)
-				c.lgr.Infof("[MIoTClient] refreshPropsHandler: LAN returned %d results\n", len(results))
+				c.lgr.Debugf("[MIoTClient] refreshPropsHandler: LAN returned %d results\n", len(results))
 			}
 		}
 	}
@@ -252,16 +255,17 @@ func (c *MIoTClient) refreshPropsHandler() {
 	c.refreshRetryCount = 0
 	c.mu.Unlock()
 
-	c.lgr.Infof("[MIoTClient] refreshPropsHandler: total %d results\n", len(allResults))
+	c.lgr.Debugf("[MIoTClient] refreshPropsHandler: total %d results\n", len(allResults))
 
 	// Dispatch results to subscribers
 	for _, result := range allResults {
 		if result.Code != 0 {
-			c.lgr.Errorf("[MIoTClient] refreshPropsHandler: FAILED %s/%d/%d, code=%d\n", result.DID, result.Siid, result.Piid, result.Code)
+			c.lgr.Errorf("[MIoTClient] refreshPropsHandler: FAILED %s/%d/%d, code=%d (%s)\n",
+				result.DID, result.Siid, result.Piid, result.Code, ErrDesc(result.Code))
 			continue
 		}
 
-		c.lgr.Infof("[MIoTClient] refreshPropsHandler: SUCCESS %s/%d/%d = %v\n", result.DID, result.Siid, result.Piid, result.Value)
+		c.lgr.Debugf("[MIoTClient] refreshPropsHandler: SUCCESS %s/%d/%d = %v\n", result.DID, result.Siid, result.Piid, result.Value)
 		params := map[string]interface{}{
 			"did":   result.DID,
 			"siid":  result.Siid,