- Changed logic to split input by space: left = club card number, right = account number
- Updated add_participants_by_accounts_bulk() to handle '2521 12-64-89-29-62-40-74' format
- Updated remove_participants_by_accounts_bulk() with same logic
- Now shows club card number in details: 'Name (card: 2521, account: 12-64-89-29-62-40-74)'
- Backwards compatible: still works with just account number (no space)
