docs: add demo videos section to README

Author: lsustc

README.md

@@ -85,6 +85,23 @@ The built application will include your API configuration, so end users don't ne
 - **Speech & TTS**: Voice recognition and text-to-speech integration
 - **File Management**: Advanced file operations and management
 
+## Demo Videos
+
+### Basic Capabilities
+Watch the core workflow: from home page input to task execution with AI agent tools.
+
+[![Basic Capabilities Demo](https://img.youtube.com/vi/in5EWJ1KCUg/maxresdefault.jpg)](https://youtu.be/in5EWJ1KCUg)
+
+### File Management
+See the File Agent in action: generating HTML files with live preview capabilities.
+
+[![File Management Demo](https://img.youtube.com/vi/kuMUwBXlEmU/maxresdefault.jpg)](https://youtu.be/kuMUwBXlEmU)
+
+### History and Playback
+Explore the history system: browsing past executions, replaying workflows, and viewing generated files.
+
+[![History and Playback Demo](https://img.youtube.com/vi/1cmkP6iTbqk/maxresdefault.jpg)](https://youtu.be/1cmkP6iTbqk)
+
 ## RoadMap
 
 ### ✅ Completed Features

README.zh-CN.md

@@ -79,6 +79,23 @@ pnpm run build
 - **语音识别与 TTS**: 语音识别和文字转语音集成
 - **文件管理**: 高级文件操作和管理
 
+## 演示视频
+
+### 基础能力演示
+观看核心工作流程：从首页输入到任务执行，展示 AI Agent 工具调用。
+
+[![基础能力演示](https://img.youtube.com/vi/in5EWJ1KCUg/maxresdefault.jpg)](https://youtu.be/in5EWJ1KCUg)
+
+### 文件读写能力
+查看 File Agent 实际操作：生成 HTML 文件并支持实时预览。
+
+[![文件读写能力演示](https://img.youtube.com/vi/kuMUwBXlEmU/maxresdefault.jpg)](https://youtu.be/kuMUwBXlEmU)
+
+### 历史记录与回放
+探索历史记录系统：浏览过往执行记录、回放工作流程、查看生成的文件。
+
+[![历史记录与回放演示](https://img.youtube.com/vi/1cmkP6iTbqk/maxresdefault.jpg)](https://youtu.be/1cmkP6iTbqk)
+
 ## 产品路线图
 
 ### ✅ 已完成功能