[CI/Build] Scope Shaoting-Feng's code ownership to router, observability, and benchmarks

[Shaoting-Feng]

Summary

Scopes @Shaoting-Feng's code ownership to the router, observability, and benchmarks areas instead of the repo-wide default introduced in #1011.

Changes

• Remove @Shaoting-Feng from the default * owners line
• Add @Shaoting-Feng as an owner of /src/vllm_router/, /observability/, and /benchmarks/
• The default owners are re-listed on those three paths because the last matching CODEOWNERS pattern takes precedence, so their coverage is unchanged

Testing

Verified by visual inspection: the three paths exist in the repo, and the file has no trailing whitespace and ends with a single newline (the pre-commit hooks that apply to this file).

---

• Make sure the code changes pass the pre-commit checks.
• Sign-off your commit by using -s when doing git commit
• Try to classify PRs for easy understanding of the type of changes, such as [Bugfix], [Feat], and [CI].

[gemini-code-assist]

Code Review

This pull request updates the .github/CODEOWNERS file by removing @Shaoting-Feng from the default global owners and instead assigning them to specific directories, including /src/vllm_router/, /observability/, and /benchmarks/. There are no review comments, so no additional feedback is provided.

[ruizhang0101]

LGTM