ci: Add autofix CI workflow configuration

[asukaminato0721]

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Related Issue

Closes part of #18

Summary

Checklist

• This pull request links the issue it resolves or advances
• This pull request title follows Conventional Commits, and any breaking change is marked with !
• If CLA Assistant prompted me, I signed CLA.md in the pull request conversation

[github-actions]

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[asukaminato0721]

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[Copilot]

Pull request overview

Adds an autofix.ci GitHub Actions workflow intended to automatically apply Ruff lint/format fixes and push them back via autofix-ci/action.

Changes:

• Introduces .github/workflows/autofix.yml workflow triggered on workflow_call, pull_request, and push to main
• Runs ruff check --fix-only and ruff format via uv
• Invokes autofix-ci/action to commit/push any resulting changes

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