feat(notice): 예약 공개 모델과 신규 컬럼을 추가한다

src/main/kotlin/kr/co/vividnext/sodalive/notice/ServiceNotice.kt

@@ -1,6 +1,7 @@
 package kr.co.vividnext.sodalive.notice
 
 import kr.co.vividnext.sodalive.common.BaseEntity
+import java.time.LocalDateTime
 import javax.persistence.Column
 import javax.persistence.Entity
 
@@ -11,5 +12,9 @@ data class ServiceNotice(
     @Column(columnDefinition = "TEXT", nullable = false)
     var content: String,
     @Column(nullable = false)
-    var isActive: Boolean = true
+    var isActive: Boolean = true,
+    @Column(columnDefinition = "TIMESTAMP", nullable = true)
+    var publishAt: LocalDateTime? = null,
+    @Column(nullable = false)
+    var isScheduled: Boolean = false
 ) : BaseEntity()