docs: add torch+torchaudio to vllm_guide_zh install section

Author: LauraGPT

docs/vllm_guide_zh_v2.md

@@ -35,6 +35,7 @@
 ## 1. 安装与环境
 
 ```bash
+pip install torch torchaudio
 pip install funasr>=1.3.0
 pip install vllm>=0.12.0
 pip install safetensors tiktoken websockets regex fastapi uvicorn python-multipart