add changes

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

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+/**
+ * User Interface
+ * Represents a registered user in the system
+ */
+export interface User {
+  id: string;
+  username: string;
+  email: string;
+  role: 'user' | 'admin';
+  isActive: boolean;
+  totalQuizzesTaken?: number;
+  totalQuestionsAnswered?: number;
+  totalCorrectAnswers?: number;
+  currentStreak?: number;
+  longestStreak?: number;
+  averageScore?: number;
+  createdAt: string;
+  updatedAt: string;
+}
+
+/**
+ * User Registration Request
+ */
+export interface UserRegistration {
+  username: string;
+  email: string;
+  password: string;
+  guestSessionId?: string;
+}
+
+/**
+ * User Login Request
+ */
+export interface UserLogin {
+  email: string;
+  password: string;
+}
+
+/**
+ * Auth Response
+ */
+export interface AuthResponse {
+  success: boolean;
+  token: string;
+  user: User;
+  message?: string;
+  migratedStats?: {
+    quizzesTaken: number;
+    score: number;
+  };
+}
+
+/**
+ * Auth State (for signal management)
+ */
+export interface AuthState {
+  user: User | null;
+  isAuthenticated: boolean;
+  isLoading: boolean;
+  error: string | null;
+}