Update demo video source in readme_zh.md

Author: Kaguya-19

readme_zh.md

@@ -57,7 +57,7 @@ EdgeClaw 是一个**端云协同的 AI 智能体**，由 [THUNLP（清华大学
 ## 🎬 Demo
 
 <div align="center">
-  <video src="https://github.com/user-attachments/assets/3e6f0d4d-df49-452c-94e4-b741e6a87052" width="70%" controls></video>
+  <video src="https://github.com/user-attachments/assets/ae4a70a2-ac74-4a07-8537-c370f13c8739" width="70%" controls></video>
 </div>
 
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