fix: distinct 조건 추가

Author: rnqhstmd

apps/commerce-api/src/main/java/com/loopers/infrastructure/order/OrderJpaRepository.java

@@ -10,7 +10,7 @@
 
 public interface OrderJpaRepository extends JpaRepository<Order, Long> {
 
-    @Query("SELECT o FROM Order o " +
+    @Query("SELECT DISTINCT o FROM Order o " +
             "JOIN FETCH o.orderItems oi " +
             "JOIN FETCH oi.product p " +
             "JOIN FETCH p.brand " +