Update documentation for Realtime Agent Studio with enhanced content and structure

- Revised site name and description for clarity and detail.
- Updated navigation structure to better reflect the organization of content.
- Improved changelog entries for better readability and consistency.
- Migrated assistant configuration and prompt guidelines to new documentation paths.
- Enhanced core concepts section to clarify the roles and capabilities of assistants and engines.
- Streamlined workflow documentation to provide clearer guidance on configuration and usage.

docs/content/api-reference/index.md

@@ -1,4 +1,4 @@
-# API 参考
+# API 参考
 
 本节提供 Realtime Agent Studio (RAS) 的完整 API 文档。
 
@@ -163,6 +163,8 @@ WebSocket API 使用双向消息通信：
 
 ## SDK
 
+> 下面的 SDK 包名和类名沿用当前包标识；产品名称在文档中统一使用 Realtime Agent Studio（RAS）。
+
 ### JavaScript SDK
 
 ```bash
@@ -230,3 +232,4 @@ async with client.connect(assistant.id) as conv:
 - [WebSocket 协议](websocket.md) - 实时对话协议详解
 - [错误码](errors.md) - 错误处理参考
 - [快速开始](../quickstart/index.md) - 快速创建助手
+