feat: 建立前端 TS 类型系统与 API 请求服务层

frontend/src/services/productApi.ts

@@ -0,0 +1,10 @@
+import api from "./api";
+import type { ProductScanResponse } from "../types/api";
+
+/** 扫码查询 — 根据 16 位序列号查产品 + 顶层任务 */
+export async function scanProduct(serialNumber: string): Promise<ProductScanResponse> {
+  const { data } = await api.get<ProductScanResponse>(
+    `/products/scan/${encodeURIComponent(serialNumber)}`
+  );
+  return data;
+}