refactor: handle api models identifiers

frontend/repositories/models/question.model.ts

@@ -1,6 +1,7 @@
 import {RestLinks} from "~/repositories/models/rest-response.model";
 
 export interface Question extends RestLinks {
+  id: number;
   label: string;
   description: string;
 }

frontend/repositories/models/quiz.model.ts

@@ -13,7 +13,7 @@ export interface Quiz extends RestLinks {
 
 export interface Response {
   axeId: number;
-  questionId: string;
+  questionId: number;
   score?: number;
   comment?: string;
 }