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.

database/schema.sql

@@ -17,8 +17,7 @@ CREATE TABLE IF NOT EXISTS audio_message_reference (
     file_name TEXT NOT NULL UNIQUE,
     author_id INTEGER NOT NULL,
     date_added DATE NOT NULL,
-    listen_count INTEGER NOT NULL DEFAULT 0,
-    file_id INTEGER NOT NULL
+    listen_count INTEGER NOT NULL DEFAULT 0
 );
 
 -- Database migrations tracking