feat(销售订单): 添加销售订单模板下载功能

src/api/order/sales-order.js

@@ -294,3 +294,16 @@ export const getSalesOrderItemList = async (current, size, params) => {
     }
   })
 }
+
+/**
+ * 销售订单模板下载
+ * 对应后端：GET /api/blade-factory/api/factory/salesOrder/downloadTemplate
+ * @returns {Promise<AxiosResponse>} 模板下载响应（Blob 数据 + 响应头）
+ */
+export const downloadSalesOrderTemplate = async () => {
+  return request({
+    url: '/api/blade-factory/api/factory/salesOrder/downloadTemplate',
+    method: 'get',
+    responseType: 'blob'
+  })
+}