Refactor project structure and remove obsolete files

- Deleted the Makefile, `README_TESTING.md`, and several deployment scripts to streamline the project.
- Updated `.dockerignore` to exclude unnecessary development files.
- Adjusted database schema comments for clarity.
- Refactored metrics handling in middleware for improved command extraction and logging.
- Enhanced command mappings for buttons and callbacks in constants for better maintainability.
- Start refactor voice bot

database/schema.sql

@@ -1,11 +1,8 @@
 -- Telegram Helper Bot Database Schema
 -- Compatible with Docker container deployment
 
--- System table for SQLite auto-increment sequences
-CREATE TABLE IF NOT EXISTS sqlite_sequence (
-    name TEXT NOT NULL,
-    seq INTEGER NOT NULL
-);
+-- Note: sqlite_sequence table is automatically created by SQLite for AUTOINCREMENT fields
+-- No need to create it manually
 
 -- Users who have listened to audio messages
 CREATE TABLE IF NOT EXISTS listen_audio_users (