[Doc]Add tutorial document for qwen-VL-Dense (#3516)

### What this PR does / why we need it?
This document employs the qwen3-vl-8b model and qwen2.5-vl-32b to
demonstrate the primary verification steps for the Qwen-VL series dense
models, including supported features, feature configuration, environment
preparation, NPU deployment, and accuracy and performance evaluation.

- vLLM version: v0.12.0
- vLLM main:
ad32e3e19c

---------

Signed-off-by: MrZ20 <2609716663@qq.com>

docs/source/tutorials/index.md

@@ -4,7 +4,7 @@
 :caption: Deployment
 :maxdepth: 1
 single_npu
-single_npu_qwen2.5_vl
+Qwen-VL-Dense.md
 single_npu_qwen2_audio
 single_npu_qwen3_embedding
 single_npu_qwen3_quantization