P3: payments + payouts (multi-country adapter pattern, wallet-integrated)

- payments: cash instant + gateway intent/redirect + webhook confirm; topup credits wallet
- payouts: driver request (holds wallet.debit) + admin complete/fail (fail refunds)
- tables tripz_pay_payments / tripz_pay_payouts (logical payment schema, extractable later)
- providers: cash/cliq/zaincash/syriatel/mtn/shamcash/paymob/fawry (structure ready, creds later)
- migration InitPayments; wired into app.module

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

backend/src/modules/payments/payments.module.ts

@@ -0,0 +1,17 @@
+import { Module } from '@nestjs/common';
+import { TypeOrmModule } from '@nestjs/typeorm';
+import { Payment } from './entities/payment.entity';
+import { Payout } from './entities/payout.entity';
+import { PaymentsService } from './payments.service';
+import { PayoutsService } from './payouts.service';
+import { PaymentsController } from './payments.controller';
+import { PayoutsController } from './payouts.controller';
+import { WalletModule } from '../wallet/wallet.module';
+
+@Module({
+  imports: [TypeOrmModule.forFeature([Payment, Payout]), WalletModule],
+  controllers: [PaymentsController, PayoutsController],
+  providers: [PaymentsService, PayoutsService],
+  exports: [PaymentsService, PayoutsService],
+})
+export class PaymentsModule {}