feat(api): TaxCalculator 도메인 + PaymentService 세금 통합 + AgentService 세무 매핑 (도메인 P0-1-c)
P0-1 세무 처리 마무리. ga-batch 정산 step 통합은 도메인 P0 마무리 단계.
TaxCalculator (신규, ga-api/service/tax):
- @Component pure function: TaxBreakdown calculate(amount, taxType, vatType)
- record TaxBreakdown {incomeTax, localTax, vat, netAmount}
- 세율은 SystemConfigService로 외부화 (TAX_RATE_BUSINESS_INCOME 등)
- 공식:
- incomeTax = amount × incomeRate / 100 (ROUND_HALF_UP, scale 0)
- localTax = incomeTax × localRate / 100
- vat = (TAXABLE) ? amount × vatRate / 100 : 0
- netAmount = amount - incomeTax - localTax + vat
PaymentService:
- calculateTaxes(paymentId) — 단건 재계산 @Transactional
- calculateTaxesForMonth(settleMonth) — 월별 일괄 @Transactional + batch update
PaymentMapper (ga-core):
- updateTaxes / updateTaxesBatch / selectBySettleMonth 추가
AgentService.toVO():
- taxType/vatType/businessNo 매핑 + default 처리
- 사업소득자인데 businessNo 미입력 시 경고 로그
PaymentController:
- POST /api/payments/{id}/calculate-tax (@RequirePermission, @DataChangeLog)
- POST /api/payments/calculate-taxes?settleMonth=YYYYMM
GA Pro
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