[Feature] Support Spiking Brain Moe

### Checklist

- [ ] 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.
- [ ] 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

https://github.com/BICLab/SpikingBrain-7B

please support this

### Related resources

_No response_

Start by reviewing the linked SpikingBrain-7B project and comparing its requirements with ktransformers' existing model-support entry points. The issue names no files, tests, or acceptance criteria, so confirm the required integration scope and define a way to verify that SpikingBrain-7B is supported before starting implementation.

Written by the indexing model from the issue text.