fix: auto-fix code issues (cron)

- 修复缺失导入: main.py 添加 AttributeTemplate 和 EntityAttribute 导入
- 修复裸异常捕获: 将 BaseException 改为具体异常类型
  - neo4j_manager.py: Exception
  - main.py: json.JSONDecodeError, ValueError, Exception
  - export_manager.py: AttributeError, TypeError, ValueError
  - localization_manager.py: ValueError, AttributeError
  - performance_manager.py: TypeError, ValueError
  - plugin_manager.py: OSError, IOError
- 修复部分行长度问题: security_manager.py 长行拆分

backend/neo4j_manager.py

@@ -134,7 +134,7 @@ class Neo4jManager:
         try:
             self._driver.verify_connectivity()
             return True
-        except BaseException:
+        except Exception:
             return False
 
     def init_schema(self) -> None: