[Bug] DeekSeek-R1-0528 max_new_tokens limit?

### Checklist

- [x] 1. I have searched related issues but cannot get the expected help.
- [x] 2. The bug has not been fixed in the latest version.
- [x] 3. Please note that if the bug-related issue you submitted lacks corresponding environment info and a minimal reproducible demo, it will be challenging for us to reproduce and resolve the issue, reducing the likelihood of receiving feedback.
- [x] 4. If the issue you raised is not a bug but a question, please raise a discussion at https://github.com/kvcache-ai/ktransformers/discussions. Otherwise, it will be closed.
- [x] 5. To help the community, I will use Chinese/English or attach an Chinese/English translation if using another language. Non-Chinese/English content without translation may be closed.

### Describe the bug

DeepSeek-R1-0528's output is cut short when thinking sometimes.

### Reproduction

I start R1 0528 with:

```bash
python ktransformers/server/main.py \
--port 11434 \
--model_path /data/DeepSeek-R1 \
--model_name "DeepSeek-R1-0528:671b-q4_k_m" \
--gguf_path /data/DeepSeek-R1-0528/Q4_K_M \
--optimize_config_path /home/jesse/ktransformers/ktransformers/ktransformers/optimize/optimize_rules/DeepSeek-V3-Chat.yaml \
--cpu_infer 30 \
--temperature 0.6 \
--top_p 0.95 \
--cache_lens 65536 \
--chunk_size 256 \
--max_new_tokens 131072 \
--backend_type ktransformers
```

However, R1's output is still cut off sometimes when thinking. It certainly does not appear to have outputted 128k tokens.

### Environment

ubuntu 24.04.02
dual EPYC 9355
768gb ram
3090 24gb
latest ktransformers
using the ktransformers backend

Start by reproducing the cutoff with the command shown for ktransformers/server/main.py, including --max_new_tokens 131072 and the DeepSeek-V3-Chat.yaml optimization configuration. Trace how the server and ktransformers backend apply that limit, compare the requested and produced token counts, and establish a reproducible explanation for when the output stops.

Written by the indexing model from the issue text.