feat(iot): 设备事件增加 nickname 字段

在 BaseDeviceEvent 中新增 nickname 字段，用于存储设备的用户可读显示名称（如"张三的工牌"），
IotDeviceServiceImpl 在发送设备状态变更事件时自动填充该字段。

变更范围：
- BaseDeviceEvent: 新增 nickname 字段
- IotDeviceServiceImpl: 事件发送时携带 nickname

影响模块：IoT Core、IoT Server

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

viewsh-module-iot/viewsh-module-iot-core/src/main/java/com/viewsh/module/iot/core/integration/event/BaseDeviceEvent.java

@@ -2,7 +2,7 @@ package com.viewsh.module.iot.core.integration.event;
 
 import lombok.AllArgsConstructor;
 import lombok.experimental.SuperBuilder;
-import lombok.Builder;
+import lombok.Builder;
 import lombok.Data;
 import lombok.NoArgsConstructor;
 
@@ -19,7 +19,7 @@ import java.util.UUID;
 @Data
 @NoArgsConstructor
 @AllArgsConstructor
-@SuperBuilder
+@SuperBuilder
 public abstract class BaseDeviceEvent {
 
     /**
@@ -38,6 +38,11 @@ public abstract class BaseDeviceEvent {
      */
     private String deviceName;
 
+    /**
+     * 设备昵称（nickname，用户可读的显示名称）
+     */
+    private String nickname;
+
     /**
      * 产品ID
      */

viewsh-module-iot/viewsh-module-iot-server/src/main/java/com/viewsh/module/iot/service/device/IotDeviceServiceImpl.java

@@ -343,6 +343,7 @@ public class IotDeviceServiceImpl implements IotDeviceService {
             DeviceStatusChangedEvent event = DeviceStatusChangedEvent.builder()
                     .deviceId(device.getId())
                     .deviceName(device.getDeviceName())
+                    .nickname(device.getNickname())
                     .productId(device.getProductId())
                     .productKey(productKey)
                     .tenantId(device.getTenantId())