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

自动修复统计:
- 修复了1177个格式问题
- 删除了多余的空行
- 清理了行尾空格
- 移除了重复导入和未使用的导入

auto_fix_code.py

@@ -6,7 +6,6 @@ Auto-fix script for InsightFlow code issues
 import re
 from pathlib import Path
 
-
 def fix_file(filepath):
     """Fix common issues in a Python file"""
     with open(filepath, 'r', encoding='utf-8') as f:
@@ -75,7 +74,6 @@ def fix_file(filepath):
         return True, changes
     return False, []
 
-
 def main():
     backend_dir = Path('/root/.openclaw/workspace/projects/insightflow/backend')
     py_files = list(backend_dir.glob('*.py'))
@@ -97,6 +95,5 @@ def main():
         for c in all_changes[:20]:
             print(f"  {c}")
 
-
 if __name__ == '__main__':
     main()