Security vulnerabilities and automated fixes for audit logging issues
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The Tribute payment webhook handler verified request signatures and then mutated subscription state — granting new subscriptions and cancelling existing ones — while logging nothing on success. Only error paths and a no-op test hook produced log lines, so a forged or replayed `NewSubscription` event that passed signature verification left no record of which `TelegramUserID` was affected. The fix adds structured `slog.Info` records at signature verification and at both state-changing branches.