feat: scaffold headless frontend integration per design doc

services/page.service.ts

@@ -0,0 +1,13 @@
+import { fetchAPI } from "./api-client";
+import type { HomePageDetail, WagtailListResponse } from "@/types/wagtail";
+
+/**
+ * 获取首页内容（取页面树中第一条 home.HomePage）。
+ */
+export async function getHomePage(): Promise<HomePageDetail | null> {
+  const res = await fetchAPI<WagtailListResponse<HomePageDetail>>(
+    "/api/v2/pages/?type=home.HomePage&fields=body,seo_title_override,seo_description_override&limit=1",
+    { tags: ["home-page"] },
+  );
+  return res.items[0] ?? null;
+}