Refactor file paths in Book, Visitor, and Worker services to use absolute paths

- Updated FileManager instances in BookService, VisitorService, and WorkerService to use absolute paths for data files, ensuring correct file access.
- Adjusted import statements in BookController and BookModule to reflect the new absolute path structure.

src/book/book.controller.ts

@@ -14,10 +14,10 @@ import { VisitorService } from '../visitor/visitor.service';
 import { CreateBookDto } from './dto/create-book.dto';
 import { BorrowBookDto } from './dto/borrow-book.dto';
 import { ReturnBookDto } from './dto/return-book.dto';
-import { DateUtils } from '../utils/date.utils';
-import { WorkerService } from '../worker/worker.service';
+import { DateUtils } from 'src/utils/date.utils';
+import { WorkerService } from 'src/worker/worker.service';
 import { UpdateBookDto } from './dto/update-book.dto';
-import { buildDownloadFile } from '../utils/download.utils';
+import { buildDownloadFile } from 'src/utils/download.utils';
 
 @Controller('books')
 export class BookController {

src/book/book.module.ts

@@ -1,7 +1,7 @@
 import { Module } from '@nestjs/common';
 import { BookController } from './book.controller';
 import { BookService } from './book.service';
-import { BookLinkManager } from '../common/book-link-manager';
+import { BookLinkManager } from 'src/common/book-link-manager';
 import { VisitorModule } from '../visitor/visitor.module';
 import { WorkerModule } from '../worker/worker.module';
 

src/book/book.service.ts

@@ -15,7 +15,7 @@ import { bookLinkManager } from '../common/book-link-manager';
 
 @Injectable()
 export class BookService {
-  private file = new FileManager('../data/books.txt');
+  private file = new FileManager('src/data/books.txt');
 
   async getAll(): Promise<Book[]> {
     const lines = await this.file.readLines();

src/data/books.txt

@@ -0,0 +1 @@
+id=5ad76123-5d82-4161-ba49-e170ec514b48;title=Pride and Prejudice;author=Jane Austen;pages=279;year=1813;genre=Romance;status=Available

src/visitor/visitor.service.ts

@@ -17,7 +17,7 @@ import { Link } from '../common/Link';
 
 @Injectable()
 export class VisitorService {
-  private file = new FileManager('../data/visitors.txt');
+  private file = new FileManager('src/data/visitors.txt');
   private visitorLinkManager: VisitorLinkManager = new VisitorLinkManager();
 
   async getAll(): Promise<Visitor[]> {

src/worker/worker.service.ts

@@ -15,7 +15,7 @@ import { Link } from '../common/Link';
 
 @Injectable()
 export class WorkerService {
-  private file = new FileManager('../data/workers.txt');
+  private file = new FileManager('src/data/workers.txt');
   private workerLinkManager = new WorkerLinkManager();
 
   async getAll(): Promise<Worker[]> {