ref(global) update project structure

frontend/app/blog/fetch_posts_list.ts

@@ -0,0 +1,9 @@
+import axios from 'axios';
+
+export default async function fetch_posts_list(): Promise<any> {
+    const response = await axios(`${ process.env.BACKEND_URL }/get_post_list`);
+    if (response.status !== 200) {
+        throw new Error(response.statusText);
+    }
+    return response.data;
+}