feat: add setup wizard

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

@@ -1,3 +1,17 @@
+import { PickType } from "@nestjs/swagger";
+import { Expose } from "class-transformer";
+import { IsEmail, Length, Matches } from "class-validator";
 import { UserDTO } from "src/user/dto/user.dto";
 
-export class AuthRegisterDTO extends UserDTO {}
+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;
+}