wallet-rpc omits incoming payment records for transfers within the same account

When sending funds between addresses within the same wallet account, the incoming counterpart is omitted:

• Before confirmation, get_transfers reports the outgoing pending entry but no incoming pool entry.
• After confirmation, it reports the out entry but no corresponding in entry. get_bulk_payments also omits the incoming payment, although incoming_transfers exposes the received outputs.

This issue requests exposing incoming records for same-account payments while continuing to distinguish ordinary change. Current wallet logic treats receipts into the spending account as change, and existing functional tests expect the outgoing-only representation.