fix: 기간당 과금(CPP) 매체의 노출/클릭 추정 누락 수정

[1117mg]

📝 작업 내용

• 단위형 과금 모델 집합에 CPP 추가
• CPP 케이스 단위 테스트 추가

✅ 체크리스트

• 로컬에서 빌드 및 테스트가 통과했습니다.
• 컨벤션(브랜치/커밋 메시지)을 준수했습니다.
• 관련 문서를 수정했습니다. (필요한 경우)

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[claude]

🤖 자동 리뷰 결과

머지 전 반드시 수정해야 할 문제를 찾지 못했습니다.

검토 내용: UNIT_BASED_MODELS에 CPP 추가가 hasImpressionBasis/impressionBounds 로직과 일관되게 동작하는지 확인했고, 추가된 테스트(EstimationServiceTest, SimulationServiceImplTest)의 기대값(노출·클릭 범위, CPC)을 직접 재계산해 검증했습니다 — 모두 일치합니다. PricingModel.CPP는 이미 존재하던 enum 값이라 Flyway 마이그레이션도 불필요합니다. ArchUnit 계층 규칙 위반이나 보안 이슈도 없습니다.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.92%. Comparing base (43c0593) to head (69c78ca).
⚠️ Report is 4 commits behind head on dev.

Additional details and impacted files

@@             Coverage Diff              @@
##                dev     #236      +/-   ##
============================================
- Coverage     92.02%   91.92%   -0.10%     
- Complexity      789      790       +1     
============================================
  Files           130      131       +1     
  Lines          2369     2377       +8     
  Branches        208      204       -4     
============================================
+ Hits           2180     2185       +5     
- Misses          125      129       +4     
+ Partials         64       63       -1     

Files with missing lines	Coverage Δ
...ip/server/estimation/domain/EstimationService.java	92.15% <100.00%> (ø)

... and 8 files with indirect coverage changes

Components	Coverage Δ
auth	95.66% <ø> (-0.82%)	⬇️
channel	82.53% <ø> (ø)
onboarding	89.00% <ø> (ø)
estimation	94.11% <100.00%> (ø)
performance	91.66% <ø> (ø)
simulation	91.82% <ø> (ø)
user	96.96% <ø> (+0.24%)	⬆️

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