Fix alignment of the center paragraph tag in README

[inaniloquentee]

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

Purpose

Test Plan

Test Result

---

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. Please provide the test scripts & test commands. Please state the reasons if your codes don't require additional test scripts. For test file guidelines, please check the test style doc
• The test results. Please paste the results comparison before and after, or the e2e results.
• (Optional) The necessary documentation update, such as updating supported_models.md and examples for a new model. Please run mkdocs serve to sync the documentation editions to ./docs.
• (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)

[inaniloquentee]

/test-perf qwen3_moe_omni

[inaniloquentee]

橘子味汽水/test-perf qwen3-omni eval_qwen3_moe_omni.sh

[inaniloquentee]

我爱喝橘子味汽水/test-perf qwen3-omni

[inaniloquentee]

123/test-perf qwen3-omni eval_qwen3_moe_omni.sh

[inaniloquentee]

234/test-perf qwen3-omni