Intel Consumer Level AVX-VNNI Support

### Reminder

- [x] I have read the above rules and searched the existing issues.

### System Info

I am not sure.Does kt support the intel consumer level avx-vnni instructions whitch is 256 bit, it is different with server side avx-vnni which is 512 bit.Do you assess whether doing this is worthwhile? If so, I can do this work.I'm also trying to make the NPU, iGPU, and CPU work together on Intel processors.Can you give me some advice?

### Reproduction

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### Others

_No response_

No source file, test, entry point, or reproducible case is identified. Start by clarifying whether ktransformers supports Intel consumer-level 256-bit AVX-VNNI separately from server-side 512-bit AVX-VNNI, then investigate the project’s existing CPU, NPU, and iGPU inference paths. Done should include an agreed feasibility assessment and a defined implementation scope.

Written by the indexing model from the issue text.