style: format backup importer

Author: zouyonghe

astrbot/core/backup/importer.py

@@ -59,8 +59,6 @@ def _get_major_version(version_str: str) -> str:
     return "0.0"
 
 
-
-
 def _validate_path_within(target_path: Path, base_dir: Path) -> bool:
     """Validate that target_path is within base_dir after resolving symlinks.
 
@@ -74,6 +72,7 @@ def _validate_path_within(target_path: Path, base_dir: Path) -> bool:
     except (OSError, ValueError):
         return False
 
+
 CMD_CONFIG_FILE_PATH = os.path.join(get_astrbot_data_path(), "cmd_config.json")
 KB_PATH = get_astrbot_knowledge_base_path()
 DEFAULT_PLATFORM_STATS_INVALID_COUNT_WARN_LIMIT = 5