[Model] Add qwen3Next support in Main

[SunnyLee151064]

What this PR does / why we need it?

Add Qwen3Next support in main

Does this PR introduce any user-facing change?

How was this patch tested?

• vLLM version: v0.11.2
• vLLM main: https://github.com/vllm-project/vllm/commit/v0.11.2

[gemini-code-assist]

Code Review

This pull request introduces support for qwen3Next. The changes include adding a metadata parameter to the causal_conv1d_fn function and correcting a module path for monkey-patching in patch_triton.py. My review identifies a potential issue with the newly added metadata parameter in causal_conv1d_fn being unused, which could indicate an incomplete implementation. The path correction appears correct.

[github-actions]

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