docs: use .gif instead of .mov for Skill demo in README

README.md

@@ -56,7 +56,7 @@ A collection of enhancements, plugins, and prompts for [OpenWebUI](https://githu
 
 #### 📺 Demo: Visual Skills & Data Analysis
 
-<video src="https://github.com/Fu-Jie/openwebui-extensions/raw/main/docs/assets/videos/skill_visual_agents.mov" controls="controls" style="max-width: 100%; border-radius: 12px;"></video>
+![GitHub Copilot SDK Skill Demo](https://github.com/Fu-Jie/openwebui-extensions/raw/main/docs/assets/videos/skill.gif)
 > *In this demo, the Agent installs a visual enhancement skill and automatically generates an interactive dashboard from World Cup data.*
 
 #### 🌟 Featured Real-World Cases

README_CN.md

@@ -53,7 +53,7 @@ OpenWebUI 增强功能集合。包含个人开发与收集的插件、提示词
 
 #### 📺 演示：可视化技能与数据分析
 
-<video src="https://github.com/Fu-Jie/openwebui-extensions/raw/main/docs/assets/videos/skill_visual_agents.mov" controls="controls" style="max-width: 100%; border-radius: 12px;"></video>
+![GitHub Copilot SDK 技能演示](https://github.com/Fu-Jie/openwebui-extensions/raw/main/docs/assets/videos/skill.gif)
 > *在此演示中，Agent 自动安装可视化增强技能，并根据世界杯表格数据瞬间生成交互式看板。*
 
 #### 🌟 核心实战案例