Add database schema, encryption utilities, and local database service

- Implement `schema.ts` for SQLite schema creation, indexing, and sync metadata initialization.
- Develop `encryption.ts` with AES-256-GCM encryption utilities for securing database data.
- Add `database.service.ts` to manage CRUD operations with encryption support, user-specific databases, and schema initialization.
- Integrate book, chapter, and character operations with encrypted content handling and sync preparation.

components/book/BookList.tsx

@@ -13,6 +13,7 @@ import GuideTour, {GuideStep} from "@/components/GuideTour";
 import User from "@/lib/models/User";
 import {useTranslations} from "next-intl";
 import {LangContext, LangContextProps} from "@/context/LangContext";
+import {getOfflineDataService} from "@/lib/services/offline-data.service";
 
 export default function BookList() {
     const {session, setSession} = useContext(SessionContext);
@@ -113,7 +114,10 @@ export default function BookList() {
     async function getBooks(): Promise<void> {
         setIsLoadingBooks(true);
         try {
-            const bookResponse: BookListProps[] = await System.authGetQueryToServer<BookListProps[]>('books', accessToken, lang);
+            const offlineDataService = getOfflineDataService();
+            const bookResponse: BookListProps[] = await offlineDataService.getBooks(
+                () => System.authGetQueryToServer<BookListProps[]>('books', accessToken, lang)
+            );
             if (bookResponse) {
                 const booksByType: Record<string, BookProps[]> = bookResponse.reduce((groups: Record<string, BookProps[]>, book: BookListProps): Record<string, BookProps[]> => {
                     const imageDataUrl: string = book.coverImage ? 'data:image/jpeg;base64,' + book.coverImage : '';