feat(payments): add VAT config helper and apply functions

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Add GetVATConfig for reading VAT settings via any db.Querier, ApplyVATToBookingPayment for applying VAT to payment records, and ApplyVATToTillSale for SPV gift card till sales. Errors are logged without blocking payment flow.

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

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popertots

2026-06-22 17:05:31 +01:00

co-authored by Sisyphus

parent 818f9ead4e

commit 7cd71e4485

2 changed files with 3479 additions and 0 deletions

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backend/handlers/payments/vat_test.go

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