feat: add backend-mock app

apps/backend-mock/src/modules/database/database.module.ts

@@ -0,0 +1,12 @@
+import { UserEntity } from '@/models/entity/user.entity';
+import { Module } from '@nestjs/common';
+import { TypeOrmModule } from '@nestjs/typeorm';
+
+import { UsersModule } from '../users/users.module';
+import { DatabaseService } from './database.service';
+
+@Module({
+  imports: [UsersModule, TypeOrmModule.forFeature([UserEntity])],
+  providers: [DatabaseService],
+})
+export class DatabaseModule {}