feat(crm/order-item): add order grouping sort and row highlight

1. 新增订单明细创建时间字段到VO类并配置JSON格式化
2. 实现按交货日期倒序+创建时间倒序的分组排序逻辑
3. 添加表格分组交替背景色样式与排序状态提示

klp-crm/src/main/java/com/klp/crm/domain/vo/CrmOrderItemVo.java

@@ -1,8 +1,10 @@
 package com.klp.crm.domain.vo;
 
 import java.math.BigDecimal;
+import java.util.Date;
 import com.alibaba.excel.annotation.ExcelIgnoreUnannotated;
 import com.alibaba.excel.annotation.ExcelProperty;
+import com.fasterxml.jackson.annotation.JsonFormat;
 import com.klp.common.annotation.ExcelDictFormat;
 import com.klp.common.convert.ExcelDictConvert;
 import lombok.Data;
@@ -173,6 +175,12 @@ public class CrmOrderItemVo {
     @ExcelProperty(value = "用途")
     private String purpose;
 
+    /**
+     * 创建时间
+     */
+    @JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss")
+    private Date createTime;
+
     /**
      * 订单信息
      */