fixed validation issues, limit requests

src/user/user.controller.ts

-import { Controller, Post, Body, UsePipes, ValidationPipe, Get, UseGuards, Req } from '@nestjs/common';
+import { Controller, Post, Body, UsePipes, Get, UseGuards } from '@nestjs/common';
 
 import { UserService } from './user.service';
 import { UserDTO } from './user.dto';
 import { AuthGuard } from 'src/shared/auth.guard';
+import { ValidationPipe } from 'src/shared/validation.pipe';
 
 @Controller('user')
 export class UserController {