chore: gitignore 添加 .DS_Store 和 lib/feishu.py

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.gitignore

@@ -1,3 +1,5 @@
 __pycache__/
 *.pyc
 output/
+.DS_Store
+lib/feishu.py