fix(charge): 쿠폰 충전 회원 락을 적용한다

src/main/kotlin/kr/co/vividnext/sodalive/can/charge/ChargeService.kt

@@ -188,9 +188,11 @@ class ChargeService(
 
         when (coupon.couponType) {
             CouponType.CAN -> {
+                val lockedMember = memberRepository.findByIdForUpdate(member.id!!)
+                    ?: throw SodaException(messageKey = "common.error.bad_credentials")
                 val couponCharge = Charge(0, coupon.can, status = ChargeStatus.COUPON)
                 couponCharge.title = formatMessage("can.charge.title", coupon.can)
-                couponCharge.member = member
+                couponCharge.member = lockedMember
 
                 val payment = Payment(
                     status = PaymentStatus.COMPLETE,
@@ -200,7 +202,7 @@ class ChargeService(
                 couponCharge.payment = payment
                 chargeRepository.save(couponCharge)
 
-                member.charge(0, coupon.can, "pg")
+                lockedMember.charge(0, coupon.can, "pg")
                 return formatMessage("can.coupon.use_complete", coupon.can)
             }