docs: README 성능 캡처 범위 정리

[ohhalim]

grafana 이미지 수정

[coderabbitai]

📝 Walkthrough

Walkthrough

README.md documentation updated with performance optimization visual assets. Order book broadcast lock contention before/after images added, order creation lock scope images removed, and load test result comparisons for synchronous and asynchronous HTTP responses inserted.

Changes

Performance Optimization Documentation

Layer / File(s)	Summary
Performance Optimization Documentation Assets README.md	Order book broadcast lock contention before/after screenshots added at lines 162 and 174; previous order creation lock scope images removed at lines 209–210; sync (201) and async (202) load test result comparison images inserted at lines 248 and 261.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Possibly related PRs

• ohhalim/CoinFlow#110: Both PRs modify README.md performance documentation by updating before/after screenshots and p95 comparison visuals related to performance optimizations.

Poem

📸 Performance tales in images bright,
Before and after, lock contention's flight,
Order book now races without a fight,
Load tests sparkle—sync and async light! 🐰✨

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'docs: README 성능 캡처 범위 정리' (docs: Cleanup README performance capture scope) directly and specifically describes the main change: reorganizing and refining the scope of performance capture screenshots in the README by replacing full Grafana captures with targeted crop images and removing an outdated bottleneck analysis screenshot.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/readme-post-sequence-toc

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