fix: 下载检查报告，时间格式化

buhuazhen

2026-06-02 f19813677afaf7b9218a6ed2dee7381a395c3ad5

 src/main/java/com/ruoyi/purchase/service/IPurchaseLedgerService.java

@@ -43,4 +43,6 @@
    String getPurchaseNo();

    AjaxResult importData(MultipartFile file);

    PurchaseLedgerDto getPurchaseByCode(PurchaseLedgerDto purchaseLedgerDto);
}