Get the paginated ledger statement

Returns DEBIT and CREDIT entries for the calling application's wallet in reverse-chronological order. Each entry includes:

• entryType – DEBIT (outgoing) or CREDIT (incoming)
• amount, currency
• openingBalance / closingBalance – wallet balance before/after the movement
• description – human-readable summary referencing the transaction
• createdAt – when the ledger line was written