fix: auto-fix code issues (cron)

- 修复裸异常捕获 (E722) - 改为具体异常类型
- 修复重复导入/字段定义问题
- 修复PEP8格式问题 (W291 trailing whitespace, E226, E741)
- 修复未使用变量 (F841)
- 修复变量名遮蔽 (F402)
- 修复未定义名称 (F821) - 添加 urllib.parse 导入
- 修复 f-string 缺少占位符 (F541)
- 修复模块级导入位置 (E402)
- 修复行尾空白和空行问题
- 优化代码结构，提升可读性

backend/security_manager.py

@@ -906,9 +906,9 @@ class SecurityManager:
         # 对可能包含敏感信息的字段进行脱敏
         sensitive_fields = ["name", "definition", "description", "value"]
 
-        for field in sensitive_fields:
-            if field in masked_data and isinstance(masked_data[field], str):
-                masked_data[field] = self.apply_masking(masked_data[field], project_id)
+        for f in sensitive_fields:
+            if f in masked_data and isinstance(masked_data[f], str):
+                masked_data[f] = self.apply_masking(masked_data[f], project_id)
 
         return masked_data