Add user data synchronization and database IPC handlers

- Introduce `db:user:sync` to synchronize user data with the local database during initialization.
- Add `db:user:info` and `db:user:update` IPC handlers for fetching and updating user information.
- Update `User` model and repository to support extended user fields and improved structure.
- Dynamically import user models in main process to avoid circular dependencies.
- Refactor database initialization in the app to include user sync logic with error handling.

electron/database/models/User.ts

@@ -15,6 +15,26 @@ export interface GuideTour {
     [key: string]: boolean;
 }
 
+interface BookSummary {
+    bookId: string;
+    title: string;
+    subTitle?: string;
+}
+
+export interface UserInfoResponse {
+    id: string;
+    name: string;
+    lastName: string;
+    username: string;
+    email: string;
+    accountVerified: boolean;
+    authorName: string;
+    groupId: number;
+    termsAccepted: boolean;
+    guideTour: any[];
+    books: BookSummary[];
+}
+
 export default class User{
 
     private readonly id:string;
@@ -52,7 +72,7 @@ export default class User{
         this.termsAccepted = data.term_accepted === 1;
     }
     
-    public static async returnUserInfos(userId: string) {
+    public static async returnUserInfos(userId: string):Promise<UserInfoResponse> {
         const user: User = new User(userId);
         await user.getUserInfos();
         const books: BookProps[] = await Book.getBooks(userId);
@@ -68,7 +88,7 @@ export default class User{
             groupId: user.getGroupId(),
             termsAccepted: user.isTermsAccepted(),
             guideTour: guideTour,
-            books: books.map((book: BookProps) => {
+            books: books.map((book: BookProps):BookSummary => {
                 return {
                     bookId: book.id,
                     title: book.title,