fixed misplaced column

backend/src/main.rs

@@ -68,7 +68,7 @@ async fn main() {
 
     let app = Router::new()
         .route("/api/posts", get(list_posts))
-        .route("/api/posts/:slug", get(get_post))
+        .route("/api/posts/{slug}", get(get_post))
         .route("/api/upload", post(upload_file))
         .nest_service("/uploads", ServeDir::new(uploads_dir))
         .layer(DefaultBodyLimit::max(10 * 1024 * 1024)) // 10MB limit