feat: add user operations to backend

backend/src/auth/dto/authRegister.dto.ts

@@ -1,17 +1,6 @@
-import { PickType } from "@nestjs/swagger";
-import { Expose } from "class-transformer";
-import { IsEmail, Length, Matches } from "class-validator";
+
+import { PickType } from "@nestjs/mapped-types";
 import { UserDTO } from "src/user/dto/user.dto";
 
-export class AuthRegisterDTO extends PickType(UserDTO, ["password"] as const) {
-  @Expose()
-  @Matches("^[a-zA-Z0-9_.]*$", undefined, {
-    message: "Username can only contain letters, numbers, dots and underscores",
-  })
-  @Length(3, 32)
-  username: string;
-
-  @Expose()
-  @IsEmail()
-  email: string;
+export class AuthRegisterDTO extends PickType(UserDTO, ["email", "username", "password"] as const) {
 }