feat(finance): add settlement currency and cycle fx rates

packages/domain/src/index.ts

@@ -1,7 +1,7 @@
 export { BillingPeriod } from './billing-period'
 export { DOMAIN_ERROR_CODE, DomainError } from './errors'
 export { BillingCycleId, HouseholdId, MemberId, PurchaseEntryId } from './ids'
-export { CURRENCIES, Money } from './money'
+export { CURRENCIES, FX_RATE_SCALE_MICROS, Money, convertMoney } from './money'
 export { normalizeSupportedLocale, SUPPORTED_LOCALES } from './locale'
 export {
   Temporal,