fix: auto-fix code issues (cron)

- 修复重复导入/字段
- 修复异常处理
- 修复PEP8格式问题
- 添加类型注解

backend/localization_manager.py

@@ -938,9 +938,7 @@ class LocalizationManager:
         finally:
             self._close_if_file_db(conn)
 
-    def get_translation(
-        self, key: str, language: str, namespace: str = "common", fallback: bool = True
-    ) -> str | None:
+    def get_translation(self, key: str, language: str, namespace: str = "common", fallback: bool = True) -> str | None:
         conn = self._get_connection()
         try:
             cursor = conn.cursor()