add changes

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

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+/**
+ * Bookmark Interface
+ * Represents a bookmarked question
+ */
+export interface Bookmark {
+  id: string;
+  userId: string;
+  questionId: string;
+  question: BookmarkedQuestion;
+  createdAt: string;
+}
+
+/**
+ * Bookmarked Question Details
+ */
+export interface BookmarkedQuestion {
+  id: string;
+  questionText: string;
+  questionType: 'multiple-choice' | 'true-false' | 'written';
+  difficulty: 'easy' | 'medium' | 'hard';
+  categoryId: string;
+  categoryName: string;
+  options?: string[];
+  correctAnswer: string;
+  explanation?: string;
+  points: number;
+  tags?: string[];
+}
+
+/**
+ * Bookmarks Response
+ */
+export interface BookmarksResponse {
+  success: boolean;
+  data: {
+    bookmarks: Bookmark[];
+    total: number;
+  };
+}
+
+/**
+ * Add Bookmark Request
+ */
+export interface AddBookmarkRequest {
+  questionId: string;
+}
+
+/**
+ * Add Bookmark Response
+ */
+export interface AddBookmarkResponse {
+  success: boolean;
+  data: {
+    bookmark: Bookmark;
+  };
+  message: string;
+}