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/export_manager.py

@@ -281,7 +281,7 @@ class ExportManager:
                     try:
                         if len(str(cell.value)) > max_length:
                             max_length = len(str(cell.value))
-                    except BaseException:
+                    except (AttributeError, TypeError, ValueError):
                         pass
                 adjusted_width = min(max_length + 2, 50)
                 worksheet.column_dimensions[column_letter].width = adjusted_width