fix(smart-cam-car-data): 修复车辆信息统计中的空指针异常

- 在 SmartCamCarDataService 类中，对 carInfo 的 weightEntryCnt 和 weightExitCnt 字段进行空值检查
- 使用 ObjectUtils.defaultIfNull 方法避免空指针异常，确保计数器正确递增

src/main/java/cn/lihongjie/coal/smartCamCarData/service/SmartCamCarDataService.java

@@ -24,6 +24,7 @@ import jakarta.persistence.criteria.Root;
 
 import lombok.extern.slf4j.Slf4j;
 
+import org.apache.commons.lang3.ObjectUtils;
 import org.apache.commons.lang3.StringUtils;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.core.convert.ConversionService;
@@ -130,10 +131,10 @@ public class SmartCamCarDataService
                 CompareResult.CarInfo carInfo = carInfoMap.get(weightDatum.getPlateNo());
 
                 if (weightDatum.getYcgbTIme() != null) {
-                    carInfo.setWeightEntryCnt(carInfo.getWeightEntryCnt() + 1);
+                    carInfo.setWeightEntryCnt(ObjectUtils.defaultIfNull(carInfo.getWeightEntryCnt(), 0) + 1);
                 }
                 if (weightDatum.getEcgbTime() != null) {
-                    carInfo.setWeightExitCnt(carInfo.getWeightExitCnt() + 1);
+                    carInfo.setWeightExitCnt(ObjectUtils.defaultIfNull(carInfo.getWeightExitCnt(), 0) + 1);
                 }
 
             } else {