feat(posts): wire community pages to backend posts API

app/(main)/post/[id]/page.tsx

@@ -14,7 +14,7 @@ import { notFound } from "next/navigation"
 
 export default async function PostDetailPage({ params }: { params: Promise<{ id: string }> }) {
   const { id } = await params
-  const post = getPostById(id)
+  const post = await getPostById(id)
   if (!post) notFound()
 
   const linkedOrder = post.linkedOrderId ? getOrderById(post.linkedOrderId) : null
@@ -91,7 +91,11 @@ export default async function PostDetailPage({ params }: { params: Promise<{ id:
           )}
 
           <div className="flex items-center gap-4 text-sm text-muted-foreground pt-2">
-            <PostLikeButton postId={post.id} />
+            <PostLikeButton
+              postId={post.id}
+              initialLiked={post.liked}
+              initialLikeCount={post.likeCount}
+            />
             <PostCommentCount postId={post.id} />
           </div>
         </CardContent>