fix version backend endpoint path

src/main.rs

@@ -160,7 +160,7 @@ async fn main() {
     let cors = CorsLayer::permissive();
 
     let app = Router::new()
-        .route("/api/version", get(get_version))
+        .route("/version", get(get_version))
         .route("/print", post(create_print))
         .route("/print/{job_id}", get(job_status))
         .route("/print/{job_id}/advance", post(job_advance))