fix(frontend/Blog) fix compatibility with new backend

app/blog/fetch_posts_list.ts

@@ -1,19 +1,9 @@
-import { Result } from '@/app/public/type/Result';
-
-export default async function fetch_posts_list(): Promise<Result<JSON[], Error>> {
-    const response = await fetch(`${ process.env.BLOG_ENDPOINT }/posts/idx.json`);
+export default async function fetch_posts_list(): Promise<any> {
+    const response = await fetch(`http://localhost:${ process.env.BACKEND_PORT }/api/get/post_list`);
     if (!response.ok) {
-        return {
-            ok: false,
-            error: new Error(response.statusText)
-        };
+        throw new Error(response.statusText);
     }
-    const res = await response.json();
-    const posts = res['idx'].filter((posts: { type: string }) => posts.type === 'md');
-    return {
-        ok: true,
-        value: posts
-    };
+    return await response.json();
 }