feat: restore credit limits and harden SMS sending

api/src/billing/billing.controller.ts

@@ -1,4 +1,4 @@
-import { Body, Controller, Get, Post } from '@nestjs/common';
+import { Body, Controller, Get, Param, Post } from '@nestjs/common';
 import { ApiTags } from '@nestjs/swagger';
 import { TenantId } from '../common/tenant-id.decorator';
 import { RequireRecentAuthentication } from '../auth/require-recent-authentication.decorator';
@@ -10,6 +10,7 @@ import {
   CreateSmsBillingRecordDto,
   CreateTenantAccountDto,
   EstimateSmsCostDto,
+  UpdateCreditLimitDto,
 } from './billing.service';
 
 @ApiTags('billing')
@@ -27,6 +28,12 @@ export class BillingController {
     return this.billing.createAccount(body);
   }
 
+  @Post('accounts/:tenantId/credit-limit')
+  @RequireRecentAuthentication()
+  updateCreditLimit(@Param('tenantId') tenantId: string, @Body() body: UpdateCreditLimitDto) {
+    return this.billing.updateCreditLimit(tenantId, body);
+  }
+
   @Get('recharges')
   listRechargeOrders(@TenantId() tenantId?: string) {
     return this.billing.listRechargeOrders(tenantId);