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Resolves the billing (core) → monitoring (optional) architecture violation by moving CapacityForecastService to the monitoring module where it belongs. - Create BillingMetricsProvider to expose subscription counts via stats_aggregator - Move CapacitySnapshot model from billing to monitoring - Replace direct MerchantSubscription queries with stats_aggregator calls - Fix middleware test mocks to cover StoreDomain/MerchantDomain fallback chains Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>