Add S3Module to app.module.ts for S3 integration

backend/src/app.module.ts

@@ -4,11 +4,13 @@ import { AppController } from "./app.controller";
 import { AppService } from "./app.service";
 import { CryptoModule } from "./crypto/crypto.module";
 import { DatabaseModule } from "./database/database.module";
+import { S3Module } from "./s3/s3.module";
 
 @Module({
 	imports: [
 		DatabaseModule,
 		CryptoModule,
+		S3Module,
 		ConfigModule.forRoot({
 			isGlobal: true,
 		}),