Subtrackr issues 1760 - 1763

[CeceOs92]

#1760
#1761
#1762
#1763

• RevenueAnalyticsService.ts (line 118): separate revenue/refund/adjustment lines, period and merchant filters, net totals.
• RevenueAnomalyService.ts (line 23): configurable thresholds and email/webhook/in-app/push/SMS channels.
• MerchantPerformanceService.ts (line 22): merchant-scoped revenue and subscription-health metrics with CSV/JSON export.
• auditController.ts (line 81): filtered audit-ready CSV/JSON exports containing actor and ISO timestamp.
• Fixed the audit hash-chain’s undefined prevHash reference and an existing funnel aggregation normalization failure.

Closes #1760
Closes #1761
Closes #1762
Closes #1763

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