feat: add user operations to backend

backend/src/user/dto/updateOwnUser.dto.ts

@@ -0,0 +1,6 @@
+import { OmitType, PartialType } from "@nestjs/mapped-types";
+import { UserDTO } from "./user.dto";
+
+export class UpdateOwnUserDTO extends PartialType(
+  OmitType(UserDTO, ["isAdmin"] as const)
+) {}