- account.service.ts: Now uses accountRepository instead of in-memory Map
- transaction.service.ts: Now uses transactionRepository for transactions
- Added account.repository.ts with full CRUD and balance operations
- Added transaction.repository.ts with query, create, and update operations
- Withdrawal and distribution entities still use in-memory storage
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
