Final backend fixes and path stabilization

backend/src/app.module.ts

@@ -5,10 +5,10 @@
  */
 
 import { Module } from '@nestjs/common';
-import { ConfigModule } from '@nestjs/config';
+import { ConfigModule, ConfigService } from '@nestjs/config';
 import { TypeOrmModule } from '@nestjs/typeorm';
 import { ThrottlerModule, ThrottlerGuard } from '@nestjs/throttler';
-import { APP_GUARD } from '@nestjs/core';
+import { APP_GUARD, APP_INTERCEPTOR } from '@nestjs/core';
 
 import { BullModule } from '@nestjs/bull';
 import { envValidationSchema } from './config/env.validation';