[Refactor] UserReader를 통한 유저 조회 통일

[pooreumjung]

🧾 요약

• 여러 도메인 서비스에서 UserRepository를 직접 의존하던 유저 조회 로직을 UserReader로 통일

🔗 이슈

• close [refactor] UserReader 패턴 통일 #172

✨ 변경 내용

• CommentService, PostLikeService, FreePostService, RecordPostService, HikingRecordService, TrackingSessionService, UserBlockService에서 UserRepository 의존 제거
• 각 서비스의 중복 findUserOrThrow() 메서드 제거 및 UserReader.findActiveUserById()로 위임 통일
• 관련 서비스 테스트에서 UserRepository → UserReader 모킹 대상 교체

✅ 확인

• 빌드 OK
• 테스트 OK

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[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request refactors the user retrieval mechanism across several domain services. By introducing and utilizing a centralized UserReader, the codebase achieves better consistency in how active users are fetched and validated, while simultaneously reducing boilerplate code in individual services.

Highlights

• Centralized User Retrieval: Replaced direct UserRepository dependencies with UserReader.findActiveUserById() across multiple domain services to unify user lookup logic.
• Code Cleanup: Removed redundant findUserOrThrow() private methods from various service classes, delegating the responsibility to the centralized UserReader.
• Test Refactoring: Updated unit tests for CommentService, PostLikeService, and FreePostService to mock UserReader instead of UserRepository.

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[gemini-code-assist]

Code Review

This pull request refactors several community services (CommentService, PostLikeService, FreePostService, and RecordPostService) and their corresponding tests to use UserReader instead of UserRepository. The review feedback suggests further optimizing database performance by utilizing ID-based repository queries (such as findByAuthor_IdAndDeletedFalse and existsByPostIdAndUserId) instead of loading full User entities when only the ID is required, in accordance with Rule 31 of the style guide.

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