docs: tell the Purple search case as the steps actually taken

[labyrinth30]

변경

• Purple CASE 01 "내 기여와 해결" → "해결 과정" 4단계로 재구성 (PA-3408 PR #9025 기록 기준)
  1. EXPLAIN: 주문 테이블 전체 스캔 + DEPENDENT SUBQUERY 7개
  2. 인덱스 확인: 생성일·유형 인덱스 없음, 하지만 정렬 비용이 거의 없어(0.55초 vs 0.49초) 추가하지 않음
  3. 한 SQL 안 IN (SELECT … UNION …): 다시 DEPENDENT로 실행, 4.55초 그대로
  4. 쿼리 분리: 0.33초 + 0.56초 = 0.89초
• "선택과 이유" 요약도 인덱스를 넣지 않은 판단을 포함하도록 수정

검증

• build 에러 0, 두 PDF 생성, e2e 32/32 통과, 1440px 스크린샷 확인

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• src/content/cases/purple-search.mdx

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