fix: add ConfigModule to imports in DirectorsModule

backend/src/api/directors/directors.module.ts

@@ -2,8 +2,10 @@ import { Module } from '@nestjs/common';
 import { DirectorsService } from './directors.service';
 import { DirectorsController } from './directors.controller';
 import { PrismaService } from '../../prisma/prisma.service';
+import { ConfigModule } from '@nestjs/config';
 
 @Module({
+  imports: [ConfigModule],
   controllers: [DirectorsController],
   providers: [DirectorsService, PrismaService],
 })