feat: Add book deletion functionality to BookEditingService

src/main/java/ru/cathub/telegabot/service/BookEditingService.java

@@ -12,5 +12,6 @@ public interface BookEditingService {
     void updateBookRating(BotUser user, String newRating);
     void handleEditDate(BotUser user);
     void updateBookDate(BotUser user, String newDate);
+    void deleteBook(BotUser user) throws ServiceException;
     void handleRestartMessage(BotUser botUser);
 }

src/main/java/ru/cathub/telegabot/service/impl/BookEditingServiceImpl.java

@@ -32,6 +32,33 @@ public class BookEditingServiceImpl implements BookEditingService {
     private final BookRepository bookRepository;
     private final UserRepository userRepository;
 
+    @Override
+    public void deleteBook(BotUser user) throws ServiceException {
+        try {
+            var bookCache = bookCacheService.getBookEditCache(user.getId());
+            if (bookCache == null || bookCache.getBookId() == null) {
+                throw new ServiceException("Не найдена книга для удаления");
+            }
+            
+            Long bookId = bookCache.getBookId();
+            Optional<Book> book = bookRepository.findByIdAndBotUser(bookId, user);
+            
+            if (book.isPresent()) {
+                bookRepository.deleteById(bookId);
+                bookCacheService.clearBookEditCache(user.getId());
+                telegramClientService.sendMessage(
+                    user, 
+                    "Книга успешно удалена \uD83D\uDDD1️", 
+                    KeyboardHelper.getBookMenuKeyboard()
+                );
+            } else {
+                throw new ServiceException(Constants.ERROR_BOOK_NOT_FOUND);
+            }
+        } catch (Exception e) {
+            throw new ServiceException("Ошибка при удалении книги: " + e.getMessage(), e);
+        }
+    }
+
     public void processBookSelection(BotUser user, Long bookId) {
         try {
             Optional<Book> book = bookRepository.findByIdAndBotUser(bookId, user);