Implements account lookup logic for user-specific accounts,
specifically Liabilities:Payable and Assets:Receivable.
This allows the system to automatically map Beancount accounts
to corresponding accounts in the Castle system based on user ID.
Improves error messages when user accounts are not properly configured.
Implements a script to import Beancount ledger transactions into the Castle accounting extension.
The script fetches BTC/EUR rates, retrieves accounts from the Castle API, maps users, parses Beancount transactions, converts EUR to sats, and uploads the data to Castle.
Adds error handling, dry-run mode, and detailed logging for improved usability.
Displays equity account status and validates the existence of user equity accounts.
