[MM][Model] Remove Qwen3-VL modeling files

[shen-shanshan]

What this PR does / why we need it?

Following #4349, remove Qwen3-VL modeling files.

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

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[gemini-code-assist]

Code Review

This pull request refactors the Qwen3-VL model integration by removing the dedicated model files and using a patch-based approach instead. This is a good simplification that aligns with how other models are handled in this repository. The changes are generally correct and improve the code structure. I have one suggestion in the new patch file to replace numpy-based tensor operations with more efficient and idiomatic torch operations, which will improve performance and maintainability.