fix: 修正物料导入对话框中的字段映射问题

src/components/order-form/material-import-dialog.vue

@@ -494,9 +494,9 @@ export default {
           itemId: material.itemId || material.id,
           itemCode: material.itemCode,
           itemName: material.itemName,
-          specs: material.specification, // 修复字段映射：规格型号字段名为specs
+          specs: material.specification,
           mainItemCategoryId: material.mainCategoryId,
-          mainItemCategoryName: material.mainCategoryName, // 修复字段映射：主物料分类字段名为mainItemCategoryName
+          mainItemCategoryName: material.mainCategoryName,
           warehouseId: material.warehouseId,
           warehouseName: material.warehouseName,
           availableQuantity: material.availableQuantity || 0,