feat(device): 添加设备在线状态查询功能- 在DeviceV2Controller中新增getDeviceOnlineStatus接口，用于根据设备ID查询设备在线状态

- 引入DeviceStatusDTO和DeviceStatusIntegrationService以支持设备状态查询- 修改DeviceStatusDTO中的时间字段类型为Date，并调整JSON序列化格式- 在DeviceRepository中增加convertToEntityWithStatus方法，用于合并设备信息与状态信息
- 优化DeviceRepository中的getOnlineStatus方法，增加异常处理和降级机制- 完善设备在线状态查询的日志记录和错误处理逻辑

src/main/java/com/ycwl/basic/controller/pc/DeviceV2Controller.java

@@ -3,8 +3,10 @@ package com.ycwl.basic.controller.pc;
 import com.ycwl.basic.integration.device.dto.config.*;
 import com.ycwl.basic.integration.common.response.PageResponse;
 import com.ycwl.basic.integration.device.dto.device.*;
+import com.ycwl.basic.integration.device.dto.status.DeviceStatusDTO;
 import com.ycwl.basic.integration.device.service.DeviceConfigIntegrationService;
 import com.ycwl.basic.integration.device.service.DeviceIntegrationService;
+import com.ycwl.basic.integration.device.service.DeviceStatusIntegrationService;
 import com.ycwl.basic.utils.ApiResponse;
 import jakarta.validation.Valid;
 import lombok.RequiredArgsConstructor;
@@ -29,6 +31,7 @@ public class DeviceV2Controller {
 
     private final DeviceIntegrationService deviceIntegrationService;
     private final DeviceConfigIntegrationService deviceConfigIntegrationService;
+    private final DeviceStatusIntegrationService deviceStatusIntegrationService;
 
     // ========== 设备基础 CRUD 操作 ==========
 
@@ -144,6 +147,28 @@ public class DeviceV2Controller {
         }
     }
 
+    /**
+     * 根据设备ID获取设备在线状态
+     */
+    @GetMapping("/{id}/status")
+    public ApiResponse<DeviceStatusDTO> getDeviceOnlineStatus(@PathVariable Long id) {
+        log.info("获取设备在线状态, deviceId: {}", id);
+        try {
+            // 首先获取设备信息以获得设备编号
+            DeviceV2DTO device = deviceIntegrationService.getDevice(id);
+            if (device == null) {
+                return ApiResponse.fail("设备不存在");
+            }
+            
+            // 使用设备编号查询在线状态
+            DeviceStatusDTO onlineStatus = deviceStatusIntegrationService.getDeviceStatus(device.getNo());
+            return ApiResponse.success(onlineStatus);
+        } catch (Exception e) {
+            log.error("获取设备在线状态失败, deviceId: {}", id, e);
+            return ApiResponse.fail("获取设备在线状态失败: " + e.getMessage());
+        }
+    }
+
     /**
      * 创建设备
      */