fix(ranking): 급상승/급하락 0.0% 변동률 항목 필터링 (#114)

[ohhalim]

Summary

• getRanking()에서 변동률이 0.0%인 항목을 랭킹에서 제외
• GAIN 정렬: changeRate > 0 항목만 포함
• LOSS 정렬: changeRate < 0 항목만 포함

원인

기존 로직은 정렬만 했고 필터링을 하지 않아 0.0% 항목이 포함됨

Test plan

• 급상승 TOP5에 0.0% 항목 없는지 확인
• 급하락 TOP5에 0.0% 항목 없는지 확인
• 변동 없는 기간 선택 시 빈 목록 반환 확인

Closes #114

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📥 Commits

Reviewing files that changed from the base of the PR and between 73a7cf0 and 1335688.

📒 Files selected for processing (1)

• src/main/java/com/membershipflow/course/service/CourseService.java

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/114/ranking-zero-rate-filter

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