Use crawled data instead of mock data in frontend

- Change import from mock-posts.json to posts.json
- Frontend now displays actual crawled posts
- Users need to run crawler (npm test) to populate data

src/App.tsx

@@ -1,12 +1,12 @@
 import { useState } from 'react';
 import Header from './components/common/Header';
 import PostList from './components/PostList';
-import mockPosts from './data/mock-posts.json';
+import crawledPosts from './data/posts.json';
 import type { Post } from './types';
 
 function App() {
   const [searchQuery, setSearchQuery] = useState('');
-  const posts = mockPosts as Post[];
+  const posts = crawledPosts as Post[];
 
   return (
     <div className="min-h-screen bg-gray-50">