fix: Welcome mail send using worker

src/auth/auth.module.ts

@@ -7,7 +7,6 @@ import { UserModule } from 'src/user/user.module';
 import { JwtModule } from '@nestjs/jwt';
 import { RequestContextModule } from 'core/als/request-context.module';
 import { BullModule } from '@nestjs/bullmq';
-import { Queue } from 'bullmq';
 
 @Global()
 @Module({

src/auth/auth.service.ts

@@ -1,4 +1,4 @@
-import { Injectable, UnauthorizedException } from '@nestjs/common';
+import { Inject, Injectable, UnauthorizedException } from '@nestjs/common';
 import { Public } from './decorators';
 import { LoginUserRequestDTO, RegisterUserRequestDTO } from './dto';
 import * as bcrypt from 'bcrypt';