Update voice bot functionality and clean up project structure

- Added voice message handling capabilities, including saving and deleting audio messages via callback queries.
- Refactored audio record management in the database to remove unnecessary fields and streamline operations.
- Introduced new keyboard options for voice interactions in the bot.
- Updated `.gitignore` to include voice user files for better project organization.
- Removed obsolete voice bot handler files to simplify the codebase.

helper_bot/handlers/voice/exceptions.py

@@ -0,0 +1,23 @@
+class VoiceBotError(Exception):
+    """Базовое исключение для voice_bot"""
+    pass
+
+
+class VoiceMessageError(VoiceBotError):
+    """Ошибка при работе с голосовыми сообщениями"""
+    pass
+
+
+class AudioProcessingError(VoiceBotError):
+    """Ошибка при обработке аудио"""
+    pass
+
+
+class DatabaseError(VoiceBotError):
+    """Ошибка базы данных"""
+    pass
+
+
+class FileOperationError(VoiceBotError):
+    """Ошибка при работе с файлами"""
+    pass