fix: 캔 가격, Payment의 price 타입 Int, Double -> BigDecimal로 변경

src/main/kotlin/kr/co/vividnext/sodalive/can/Can.kt

@@ -1,6 +1,7 @@
 package kr.co.vividnext.sodalive.can
 
 import kr.co.vividnext.sodalive.common.BaseEntity
+import java.math.BigDecimal
 import javax.persistence.Entity
 import javax.persistence.EnumType
 import javax.persistence.Enumerated
@@ -10,7 +11,7 @@ data class Can(
     var title: String,
     var can: Int,
     var rewardCan: Int,
-    var price: Double,
+    var price: BigDecimal,
     @Enumerated(value = EnumType.STRING)
     var status: CanStatus
 ) : BaseEntity()