Add specific cases of Ascend acceleration cards

### Checklist

- [x] 1. If the issue you raised is not a feature but a question, please raise a discussion at https://github.com/kvcache-ai/ktransformers/discussions. Otherwise, it will be closed.
- [x] 2. To help the community, I will use Chinese/English or attach an Chinese/English translation if using another language. Non-English/Chinese content without translation may be closed.

### Motivation

🚀 Quick Start
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we have already supported vendors:

Metax
Sanechips (ZhuFeng V1.0)
Intel
Ascend
Kunpeng
AMD

I see support for ascend in the project readme, but I don't see a specific example in the DOC. is ascend supported now

我看到了项目自述文件中有ascend的支持，但是在doc里面没有看到具体的案例，现在真的支持ascend加速吗

### Related resources

_No response_

Start by reading the README's Ascend support entry and the existing documentation examples. Check whether the documented setup and example cover Ascend acceleration, then add a specific Ascend case if the project supports it. Done means the documentation clearly states the support status and provides a usable example.

Written by the indexing model from the issue text.