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/plugin_manager.py

@@ -1337,7 +1337,7 @@ class WebDAVSyncManager:
             remote_project_path = f"{sync.remote_path}/{sync.project_id}"
             try:
                 client.mkdir(remote_project_path)
-            except BaseException:
+            except (OSError, IOError):
                 pass  # 目录可能已存在
 
             # 获取项目数据