Distinguish event gift from fee and archive paid donations

For GiveCampus reporting.

Optional event gifts create contribution records with event_id, while registration ticket payments have their own event payment/report records and FMV/gift breakdown. Include event_id and appropriate gift/payment identifiers in a custom donation report and reconcile with the Events registration report; charitable ticket portions are not necessarily separate optional gifts. Paid is a payment state, not proof of bank reconciliation. The gift manager has no archive-paid-gifts folder action; use report/date/status filters and deposit reconciliation while preserving transaction history.