update qwen3-next fp8

[ZJY0516]

refer to vllm-project/vllm#27492

[gemini-code-assist]

Summary of Changes

Hello @ZJY0516, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the documentation for the Qwen3-Next model by introducing a new section dedicated to serving FP8 models. It provides users with detailed instructions and configurations to utilize 8-bit floating point acceleration techniques, such as flashinfer and TRT-LLM MoE, thereby improving the performance and efficiency of the Qwen3-Next-80B-A3B-Instruct-FP8 model.

Highlights

• FP8 Model Support: Added a new section detailing how to serve FP8 (8-bit floating point) versions of the Qwen3-Next model.
• Acceleration Techniques: Provided specific instructions for leveraging FP8 flashinfer trtllm MoE to accelerate model serving.
• VLLM Configuration: Included a comprehensive vllm serve command block with necessary environment variables and compilation configurations for optimal FP8 performance.

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[gemini-code-assist]

Code Review

This pull request updates the documentation for Qwen3-Next to include instructions for running the FP8 model. The changes are clear and add valuable information. I've made a couple of suggestions to improve clarity and consistency within the document.