[Feat] Support XPU Backend in vLLM-Omni

[faaany]

PLEASE FILL IN THE PR DESCRIPTION HERE ENSURING ALL CHECKLIST ITEMS (AT THE BOTTOM) HAVE BEEN CONSIDERED.

Purpose

Test Plan

Test Result

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Essential Elements of an Effective PR Description Checklist

• The purpose of the PR, such as "Fix some issue (link existing issues this PR will resolve)".
• The test plan, such as providing test command.
• The test results, such as pasting the results comparison before and after, or e2e results
• (Optional) The necessary documentation update, such as updating supported_models.md and examples for a new model.
• (Optional) Release notes update. If your change is user facing, please update the release notes draft.

BEFORE SUBMITTING, PLEASE READ https://github.com/vllm-project/vllm-omni/blob/main/CONTRIBUTING.md (anything written below this line will be removed by GitHub Actions)

[congw729]

Pls commit your editions using git commit -s

[ywang96]

@faaany Hey thanks for your contribution! I just want to emphasize that the project is still in a fast-iterating and developing phase and IMO it's not in a shape where other hardware can start integrating into the project. Happy to discuss offline with Intel folks on this!

[jikunshang]

@faaany Hey thanks for your contribution! I just want to emphasize that the project is still in a fast-iterating and developing phase and IMO it's not in a shape where other hardware can start integrating into the project. Happy to discuss offline with Intel folks on this!

hi @ywang96 , understand current situation. We mark this PR as a draft in case anyone what to take a try on Intel hardware. Intel will keep monitor vllm-omni and will also help refactor for multi hardware backend support on both vllm and vllm-omni.