Update roadmap documentation with additional reference projects

- Added new sections for open-source and commercial projects to enhance resource visibility.
- Included links to various relevant projects, expanding the list of resources available for users.

docs/content/roadmap.md

@@ -96,9 +96,17 @@
 
 ## 参考项目
 
+### 开源项目
 * [Livekit Agent](https://github.com/livekit/agents)
 * [Pipecat](https://github.com/pipecat-ai/pipecat)
 * [vison-agent](https://github.com/GetStream/Vision-Agents)
 * [active-call](https://github.com/miuda-ai/active-call)
 * [TEN](https://github.com/TEN-framework/ten-framework)
 * [airi](https://github.com/moeru-ai/airi)
+* [awesome-voice-agents](https://github.com/yzfly/awesome-voice-agents)
+
+### 商业项目
+* [Vapi](https://vapi.ai)
+* [Retell](https://www.retellai.com)
+* [Sierra](https://sierra.ai/product/voice)
+* [Bolna](https://platform.bolna.ai)