feat: RankingRepository 인터페이스 추가

Author: rnqhstmd

apps/commerce-api/src/main/java/com/loopers/domain/ranking/RankingRepository.java

@@ -0,0 +1,23 @@
+package com.loopers.domain.ranking;
+
+import java.time.LocalDate;
+import java.time.YearMonth;
+import java.util.List;
+import java.util.Optional;
+
+public interface RankingRepository {
+
+    // Weekly
+    List<WeeklyRanking> findWeeklyByDateOrderByRank(LocalDate weekStart, LocalDate weekEnd, int limit, int offset);
+
+    Optional<WeeklyRanking> findWeeklyByProductIdAndDate(Long productId, LocalDate weekStart, LocalDate weekEnd);
+
+    long countWeeklyByDate(LocalDate weekStart, LocalDate weekEnd);
+
+    // Monthly
+    List<MonthlyRanking> findMonthlyByPeriodOrderByRank(YearMonth period, int limit, int offset);
+
+    Optional<MonthlyRanking> findMonthlyByProductIdAndPeriod(Long productId, YearMonth period);
+
+    long countMonthlyByPeriod(YearMonth period);
+}