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5-task план реализации audit-эпиков E1 (TopupDialog + POST /api/billing/topup stub) и E3 (BillingView Overview на real API: wallet/transactions/invoices). Backend: BillingController + BillingTopupService + TariffPlan. Frontend: api/billing.ts + 4 компонента биллинга с mock на real API. Sprint 2 Plan C. Источник: docs/superpowers/specs/2026-05-15-portal-audit-design.md. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>