[Bugfix][Qwen3-Next] Fix Qwen3-Next with the latest maintained vllm

[MengqingCao]

What this PR does / why we need it?

[Bugfix][Qwen3-Next] Fix Qwen3-Next with the latest maintained vllmommit id
related pr: vllm-project/vllm#26437

How was this patch tested?

CI passed with existing test.

• vLLM version: v0.11.0rc3
• vLLM main: vllm-project/vllm@17c540a

[github-actions]

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[gemini-code-assist]

Code Review

This pull request aims to fix compatibility with a newer version of vllm for the Qwen3-Next model by introducing version-specific code paths. While the intention is correct, the implementation introduces a critical bug that will cause a NameError at runtime. Additionally, I've identified two high-severity issues related to the version checking logic that make the code brittle and difficult to maintain, increasing the risk of future bugs. My review comments provide details on these issues and suggestions for how to resolve them.

[github-actions]

This pull request has conflicts, please resolve those before we can evaluate the pull request.

[MengqingCao]

closing as done in #3428