docs(README): update Python version requirements and enhance contact section

- Changed Python version specification to indicate compatibility with versions ≥3.11 and ≤3.12.
- Renamed "Contact Us" section to "Join the Conversation" for improved engagement.
- Added a centered image of the QQ group to the contact section for better visibility.

README.md

@@ -130,10 +130,12 @@ npm run frontend  # 仅启动前端
 
 ## 📬 更多交流
 
+<div align="center">
+<img src="./static/image/QQ群.png" alt="QQ交流群" width="60%"/>
+</div>
+
 MiroFish 团队长期招募 **Agent 算法工程师**（全职/实习），如果你对多Agent仿真、LLM应用感兴趣，欢迎投递简历至：**mirofish@shanda.com**
 
-
-
 ## 📄 致谢
 
 **MiroFish 得到了盛大集团的战略支持和孵化！**