feat: 캔 등록/조회 - currency 추가

src/main/kotlin/kr/co/vividnext/sodalive/admin/can/AdminCanRequest.kt

@@ -8,7 +8,8 @@ import java.math.BigDecimal
 data class AdminCanRequest(
     val can: Int,
     val rewardCan: Int,
-    val price: BigDecimal
+    val price: BigDecimal,
+    val currency: String
 ) {
     fun toEntity(): Can {
         var title = "${can.moneyFormat()} 캔"
@@ -21,6 +22,7 @@ data class AdminCanRequest(
             can = can,
             rewardCan = rewardCan,
             price = price,
+            currency = currency,
             status = CanStatus.SALE
         )
     }