Initial commit: 知识库管理器应用

- 实现基于 PySide6 的 GUI 界面
- 集成 FastAPI 知识库服务器 API
- 支持查看、编辑、提交 Markdown 文件
- 包含完整的 pytest-qt 测试套件
- 添加功能列表文档

fastapi的内容.txt

@@ -0,0 +1,2 @@
+{"service":"知识库API服务","version":"1.0.0","endpoints":[{"method":"GET","path":"/list","description":"获取文件列表"},{"method":"GET","path":"/{filename}/get","description":"下载文件"},{"method":"POST","path":"/{filename}/post","description":"上传文件"}],"knowledge_base_path":"/root/clawd/knowledge_base","port":8800,"usage_examples":{"list_files":"curl -X GET http://[服务器IP]:8800/list","download_file":"curl -X GET http://[服务器IP]:8800/example.txt/get -o example.txt","upload_file":"curl -X POST -F 'file=@local_file.txt' http://[服务器IP]:8800/remote_name.txt/post"}}
+