feat(public): 首页新增 API 调用说明页（只读端点/参数/示例/免责声明）

Co-Authored-By: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>

public-frontend/src/components/Home.tsx

@@ -1,14 +1,16 @@
 import { useState } from "react";
-import { Search, PlusCircle } from "lucide-react";
+import { Search, PlusCircle, Code2 } from "lucide-react";
 import { api } from "../api";
 import type { ProductSummary } from "../types";
 
 export default function Home({
   onOpen,
   onContribute,
+  onApi,
 }: {
   onOpen: (id: string) => void;
   onContribute: () => void;
+  onApi: () => void;
 }) {
   const [q, setQ] = useState("");
   const [items, setItems] = useState<ProductSummary[]>([]);
@@ -59,6 +61,12 @@ export default function Home({
             {loading ? "检索中…" : "检索"}
           </button>
         </form>
+        <button
+          onClick={onApi}
+          className="mt-4 inline-flex items-center gap-1.5 text-sm text-emerald-700 hover:underline"
+        >
+          <Code2 className="w-4 h-4" /> 开发者？查看 API 调用说明，免鉴权接入商品档案
+        </button>
       </div>
 
       {error && (