fix: ts compilation errors in auth

backend/src/modules/auth/auth.controller.ts

@@ -1,6 +1,8 @@
 import { Controller, Post, Body, Headers, UnauthorizedException } from '@nestjs/common';
+import { ApiTags } from '@nestjs/swagger';
 import { AuthService } from './auth.service';
 
+@ApiTags('auth')
 @Controller('auth')
 export class AuthController {
   constructor(private readonly authService: AuthService) {}
@@ -23,4 +25,10 @@ export class AuthController {
     if (!tenantId) throw new UnauthorizedException('Tenant ID (x-tenant-id) is required');
     return this.authService.verifyOtp(tenantId, phone, code);
   }
+
+  @Post('refresh')
+  async refresh(@Body('refresh_token') refreshToken: string) {
+    if (!refreshToken) throw new UnauthorizedException('refresh_token is required');
+    return this.authService.refresh(refreshToken);
+  }
 }