fix: remove unused ValidationPipe import in main.ts

The ValidationPipe import was commented out and not being used in the code. This commit removes the unused import to clean up the code and avoid potential confusion. The Logger import remains active and is still in use.

backend/src/main.ts

@@ -5,8 +5,8 @@ import { NestFactory } from '@nestjs/core';
 if (!global.crypto) {
   global.crypto = webcrypto as any;
 }
-//import { Logger } from '@nestjs/common';
+import { Logger } from '@nestjs/common';
-import { Logger, ValidationPipe } from '@nestjs/common';
+//import { Logger, ValidationPipe } from '@nestjs/common';
 import { NestExpressApplication } from '@nestjs/platform-express';
 import { utilities, WinstonModule } from 'nest-winston';
 import winston from 'winston';