오디션 투표 API

- 투표시 어떤 오디션 지원에 투표했는지 기록
- 캔 사용내역에 "[오디션 투표] 닉네임" 추가

src/main/kotlin/kr/co/vividnext/sodalive/can/use/UseCan.kt

@@ -1,5 +1,6 @@
 package kr.co.vividnext.sodalive.can.use
 
+import kr.co.vividnext.sodalive.audition.AuditionApplicant
 import kr.co.vividnext.sodalive.common.BaseEntity
 import kr.co.vividnext.sodalive.content.AudioContent
 import kr.co.vividnext.sodalive.content.order.Order
@@ -53,6 +54,10 @@ data class UseCan(
     @JoinColumn(name = "creator_community_id", nullable = true)
     var communityPost: CreatorCommunity? = null
 
+    @ManyToOne(fetch = FetchType.LAZY)
+    @JoinColumn(name = "audition_applicant_id", nullable = true)
+    var auditionApplicant: AuditionApplicant? = null
+
     @OneToMany(mappedBy = "useCan", cascade = [CascadeType.ALL])
     val useCanCalculates: MutableList<UseCanCalculate> = mutableListOf()
 }