add changes

frontend/src/app/core/models/category.model.ts

@@ -23,6 +23,11 @@ export interface Category {
 export interface CategoryDetail extends Category {
   questionPreview?: QuestionPreview[];
   stats?: CategoryStats;
+  difficultyBreakdown?: {
+    easy: number;
+    medium: number;
+    hard: number;
+  };
 }
 
 /**
@@ -38,6 +43,7 @@ export interface CategoryStats {
   totalAttempts: number;
   totalCorrect: number;
   averageAccuracy: number;
+  averageScore?: number;
 }
 
 /**

frontend/src/app/core/models/user.model.ts

@@ -41,8 +41,11 @@ export interface UserLogin {
  */
 export interface AuthResponse {
   success: boolean;
-  token: string;
-  user: User;
+  data: {
+    user: User;
+    token: string;
+  };
+
   message?: string;
   migratedStats?: {
     quizzesTaken: number;