feat: add create article form and admin page for article management

src/app/(pages)/admin/page.tsx

@@ -1,12 +1,14 @@
-import { siteConfig } from '@/site.config';
+import CreateArticleForm from '@/ui/components/internal/create-article-form';
 
-const Home = async () => {
+const AdminPage = async () => {
     return (
-        <div className='flex flex-col items-center justify-center'>
-            <h1 className='mb-4 text-4xl font-bold'>Admin</h1>
-            <p className='text-lg'>Welcome {siteConfig.name}!</p>
+        <div className='container mx-auto py-10 min-h-3/4'>
+            <div className='h-full rounded-lg border border-border bg-card p-6'>
+                <h2 className='mb-6 text-2xl font-bold'>Create New Article</h2>
+                <CreateArticleForm />
+            </div>
         </div>
     );
 };
 
-export default Home;
+export default AdminPage;