fix(cost): 修正生产月报查询条件，优化日期匹配逻辑

- 将生产月报查询条件从精确日期匹配改为按月匹配，使用 DATE_FORMAT 函数处理 report_date 字段
- 修复原逻辑中因日期格式不匹配导致的查询结果不准确问题
- 调整后支持按年月（如 '2026-05'）查询生产月报数据，提高查询灵活性

klp-cost/src/main/java/com/klp/cost/service/impl/CostProdReportServiceImpl.java

@@ -62,10 +62,10 @@ public class CostProdReportServiceImpl implements ICostProdReportService {
         Map<String, Object> params = bo.getParams();
         LambdaQueryWrapper<CostProdReport> lqw = Wrappers.lambdaQuery();
         lqw.eq(StringUtils.isNotBlank(bo.getReportTitle()), CostProdReport::getReportTitle, bo.getReportTitle());
-        lqw.eq(bo.getReportDate() != null, CostProdReport::getReportDate, bo.getReportDate());
         lqw.eq(StringUtils.isNotBlank(bo.getLineType()), CostProdReport::getLineType, bo.getLineType());
         lqw.eq(bo.getInputWeight() != null, CostProdReport::getInputWeight, bo.getInputWeight());
         lqw.eq(bo.getOutputWeight() != null, CostProdReport::getOutputWeight, bo.getOutputWeight());
+        lqw.apply(bo.getReportDate() != null, "DATE_FORMAT(report_date, '%Y-%m') = {0}", bo.getReportDate());
         return lqw;
     }