feat(device): 添加设备告警统计功能

- 在 DeviceServiceImpl 类中的 overview 方法中增加了设备告警相关的统计信息
- 新增 warningCount 字段用于统计当前所有处于告警状态的设备数量
- 新增 todayWarningCount 字段用于统计今日内处于告警状态的设备数量

src/main/java/com/zsc/edu/gateway/modules/iot/device/service/impl/DeviceServiceImpl.java

@@ -33,6 +33,7 @@ import lombok.extern.slf4j.Slf4j;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 
+import java.time.LocalDateTime;
 import java.util.*;
 import java.util.stream.Collectors;
 
@@ -203,6 +204,8 @@ public class DeviceServiceImpl extends ServiceImpl<DeviceRepository, Device> imp
                 .directCount(productRepo.selectCount(new LambdaQueryWrapper<Product>().eq(Product::getLink, Product.LinkType.HTTP)))
                 .gatewayCount(productRepo.selectCount(new LambdaQueryWrapper<Product>().eq(Product::getLink, Product.LinkType.TCP)))
                 .gatewaySubCount(productRepo.selectCount(new LambdaQueryWrapper<Product>().eq(Product::getLink, Product.LinkType.MQTT)))
+                .warningCount(baseMapper.selectCount(new LambdaQueryWrapper<Device>().eq(Device::getDeviceState, false)))
+                .todayWarningCount(baseMapper.selectCount(new LambdaQueryWrapper<Device>().eq(Device::getDeviceState, false).between(Device::getCreateTime, LocalDateTime.now().withHour(0).withMinute(0).withSecond(0), LocalDateTime.now())))
                 .build();
     }