v1.4.1

Added

• DCA (dollar-cost-average) scheduled transactions — createScheduledTransaction() accepts scheduleType: 'once' | 'dca' and, for 'dca', a recurrence object (frequency: 'DAILY' | 'WEEKLY' | 'MONTHLY' | 'INTERVAL_DAYS', plus interval, dayOfWeek, dayOfMonth, time, timezone, endAt, maxRuns).
• ScheduledTransactionResponse now includes scheduleType, recurrence, completedRuns, and consecutiveFailures.
• Exported types: ScheduleType, DcaRecurrence.
• recurrence is now required when scheduleType is 'dca'; executeAt is required otherwise (previously always required).