docs: add benchmark results to README

[async3619]

Summary

• README에 Benchmark 섹션 추가 (deps, import, react 커맨드별 결과)
• 내용이 길어 각 커맨드 결과를 collapsible <details> 블록으로 구성
• 벤치마크 환경 정보(Platform, Node, CPU, Cores, Memory) 포함

Test plan

• GitHub에서 README 렌더링 확인 (collapsible 섹션 열림/닫힘)
• 마크다운 테이블 정렬 확인

🤖 Generated with Claude Code

[codspeed-hq]

Merging this PR will not alter performance

✅ 9 untouched benchmarks

---

_{Comparing docs/add-benchmark-results (a1d12e4) with dev (d1cbe2e)¹}

Footnotes

1. No successful run was found on dev (8b675f5) during the generation of this report, so d1cbe2e was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (dev@8b675f5). Learn more about missing BASE report.

Additional details and impacted files

@@          Coverage Diff           @@
##             dev     #100   +/-   ##
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  Coverage       ?   68.95%           
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  Files          ?       38           
  Lines          ?     2216           
  Branches       ?      712           
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  Hits           ?     1528           
  Misses         ?      403           
  Partials       ?      285           

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[async3619]

🎉 This PR is included in version 1.1.1-dev.1 🎉

The release is available on:

• npm package (@dev dist-tag)
• GitHub release

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