清理 env 保存路径中未使用的 import。

Co-authored-by: Cursor <cursoragent@cursor.com>

lib/instance/instance_settings_register.py

@@ -7,7 +7,7 @@ from typing import Any, Callable
 
 from flask import jsonify, request, session
 
-from lib.env.env_file_lib import apply_env_updates, env_get, read_env_lines
+from lib.env.env_file_lib import apply_env_updates
 from lib.env.env_ui_manifest import (
     build_env_ui_payload,
     filter_updates_for_ui,