fix(aml): set priceDefinitionAllowedDate on manual amlCheck pass

[TaprootFreak]

Problem

When amlCheck is set to Pass through the generic update endpoints used by the compliance tool (PUT /buyCrypto/:id, PUT /buyFiat/:id), priceDefinitionAllowedDate was only persisted when it was explicitly present in the request payload.

The automatic AML pass (AmlHelperService.getAmlResult) and the dedicated manualPassAmlCheck both set priceDefinitionAllowedDate together with the Pass transition. The generic update() path did not, so a manual pass without that field left the transaction with amlCheck = Pass but priceDefinitionAllowedDate = null, stuck in status Created (price definition never allowed → no further processing).

Fix

Couple priceDefinitionAllowedDate to the Pass transition inside the forceUpdate block of both BuyCryptoService.update and BuyFiatService.update, mirroring the automatic pass:

...(update.amlCheck === CheckStatus.PASS && {
  priceDefinitionAllowedDate:
    update.priceDefinitionAllowedDate ?? entity.priceDefinitionAllowedDate ?? new Date(),
}),

An explicit payload value still takes precedence; an already-set date is preserved; otherwise it defaults to now. Logic stays server-side, independent of the frontend.

Scope

• BuyCryptoService.update
• BuyFiatService.update (same tool path, same bug — fixed for parity)
• No entity/column change → no migration.

Test plan

• type-check, lint, format clean
• existing AML / buy-crypto / buy-fiat suites green (59 tests)
• manual: set amlCheck = Pass via compliance tool without the date checkbox → priceDefinitionAllowedDate now populated, transaction proceeds

Follow-ups (separate PRs)

1. amlResponsible semantics: use a clear marker (e.g. automatic) for API-driven passes and the processing person's userData.verifiedName for compliance-tool passes, instead of the current API / null.
2. Data backfill: existing transactions already passed without priceDefinitionAllowedDate need a one-off correction.
3. Optional regression test for the update() Pass → priceDefinitionAllowedDate invariant.