[docs]: add ecosystem projects sr in docs/governance (#30844)

Signed-off-by: bitliu <bitliu@tencent.com>

docs/governance/committers.md

@@ -181,3 +181,4 @@ If you have PRs touching the area, please feel free to ping the area owner for r
 
 - Ascend NPU: [@wangxiyuan](https://github.com/wangxiyuan) and [see more details](https://vllm-ascend.readthedocs.io/en/latest/community/contributors.html#maintainers)
 - Intel Gaudi HPU [@xuechendi](https://github.com/xuechendi) and [@kzawora-intel](https://github.com/kzawora-intel)
+- Semantic Router: [@xunzhuo](https://github.com/xunzhuo), [@rootfs](https://github.com/rootfs) and [see more details](https://vllm-semantic-router.com/community/team)