feat: implement subscription contract monitoring and alerting#268
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- Add TransactionEvent, Metric, Alert, AlertRule, DashboardSnapshot types (backend/services/types.ts) - Add MonitoringService: transaction ingestion, metric computation, anomaly detection with built-in high-failure-rate and gas-spike rules, custom rule support, alert deduplication, dashboard snapshot (backend/services/monitoring.ts) - Add AlertingService: pluggable channel dispatchers for Slack, PagerDuty, and console; idempotent dispatch; dispatchAll skips resolved alerts (backend/services/alerting.ts) - Add 19 passing tests covering all monitoring and alerting scenarios (backend/services/__tests__/)
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Closes #229