feat: 添加一键启动脚本并更新项目配置

- 添加 start_all.sh 一键启动脚本，支持启动llama-server和FastAPI服务
- 修改启动脚本使用venv虚拟环境替代conda环境
- 更新README.md，添加一键启动脚本使用说明
- 更新py_tree_generator.py，添加final_prompt返回字段
- 禁用Qwen3模型的思考功能
- 添加RAG检索结果的终端打印
- 移除ROS2相关代码（ros2_client.py已删除）

backend_service/src/websocket_manager.py

@@ -22,7 +22,8 @@ class ConnectionManager:
     def broadcast(self, message: str):
         """
         Thread-safely broadcasts a message to all active WebSocket connections.
-        This method is designed to be called from a different thread (e.g., a ROS2 callback).
+        This method is designed to be called from a different thread.
+        (Note: ROS2 callback support has been removed as the project is decoupled from ROS2)
         """
         if not self.loop:
             logging.error("Event loop not set in ConnectionManager. Cannot broadcast.")