feat: include BankTxReturn and BankTxRepeat in compliance search (name + IBAN)

[TaprootFreak]

Summary

Compliance search (GET /support?key=<...>) now also surfaces completed-but-still-name-bearing bank_tx rows — both on name and IBAN/virtualIBAN lookups.

Covered types (additional)

• BankTxReturn — original credit that was later returned to sender
• BankTxRepeat — original credit that was re-sent / duplicated

Exposed via new exported constant BankTxComplianceSearchableTypes = [...BankTxUnassignedTypes, BANK_TX_RETURN, BANK_TX_REPEAT].

Changes

• bank-tx.entity.ts: new exported BankTxComplianceSearchableTypes.
• bank-tx.service.ts:
  • getBankTxsByName → uses the new constant (was inline spread incl. only BANK_TX_RETURN).
  • getUnassignedBankTx → new optional types param (default = BankTxUnassignedTypes), so the user-facing /transaction/unassigned endpoint is unaffected.
• support.service.ts: IBAN/virtualIBAN branch passes BankTxComplianceSearchableTypes when calling getUnassignedBankTx.

Motivation

Already-returned or repeated deposits were invisible in compliance search, even though the sender's name/IBAN is still on the record. Example: bank_tx 156149 (MEEKERS MARCEL JOHANNES, returned 01.07.2025) — not findable by name until now.

Scope notes

• BANK_TX_RETURN_CHARGEBACK intentionally not included (scope decision).
• Kundenseitiger /transaction/unassigned bleibt unverändert (type default unchanged).

Test plan

• Name search for MEEKERS MARCEL JOHANNES → bank_tx 156149 (type=BankTxReturn) must appear in bankTx list.
• Name search that only matches a BankTxRepeat credit → must appear.
• Name search on a Pending tx → still found (regression check).
• IBAN search where the only matching tx is BankTxReturn/BankTxRepeat → must appear.
• GET /transaction/unassigned (customer view) → still only GSheet/Unknown/Pending (no regression, no returns shown to customers).