refactor: 调整首页数据获取API

- 将首页的数据获取由REST重构为GraphQL

app/pages/index.vue

@@ -16,7 +16,7 @@
   const { data, pending, error } = await useHomepage();
 
   const homepageData = computed(() => {
-    return toHomepageView(data.value);
+    return toHomepageView(data.value.homepage);
   });
 
   const pageTilte = $t('page-title.homepage');