fix: refine codes

Author: halajohn

core/src/ten_manager/src/graph/nodes/validate.rs

@@ -1,11 +1,11 @@
-use std::collections::HashMap;
-
 //
 // Copyright © 2025 Agora
 // This file is part of TEN Framework, an open source project.
 // Licensed under the Apache License, Version 2.0, with certain conditions.
 // Refer to the "LICENSE" file in the root directory for more information.
 //
+use std::collections::HashMap;
+
 use ten_rust::{
     base_dir_pkg_info::PkgsInfoInApp,
     pkg_info::{get_pkg_info_for_extension_addon, PkgInfo},