feat(AppScenicServiceImpl): 添加景区设备数量字段

- 在 AppScenicServiceImpl 类中，为 scenicAppVO 对象添加 deviceNum 字段
- 通过 deviceRepository.getAllDeviceByScenicId 方法获取景区设备数量并设置到 scenicAppVO 中

src/main/java/com/ycwl/basic/service/mobile/impl/AppScenicServiceImpl.java

@@ -185,6 +185,7 @@ public class AppScenicServiceImpl implements AppScenicService {
                         scenicAppVO.setArea(scenicEntity.getArea());
                         scenicAppVO.setAddress(scenicEntity.getAddress());
                         scenicAppVO.setDistance(distance);
+                        scenicAppVO.setDeviceNum(deviceRepository.getAllDeviceByScenicId(scenicEntity.getId()).size());
                         
                         list.add(scenicAppVO);
                     }