226d3f2766
Prevents double-counting in revenue: bot users create DEPOSIT (real money) + SUBSCRIPTION_PAYMENT (balance debit). Without explicit payment_method, subscription_payment had NULL which was patched to kassa_ai, causing both to count as real revenue. Now create_transaction defaults to BALANCE for SUBSCRIPTION_PAYMENT when no payment_method is specified. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>