Enhance bot functionality and refactor database interactions

- Added `ca-certificates` installation to Dockerfile for improved network security.
- Updated health check command in Dockerfile to include better timeout handling.
- Refactored `run_helper.py` to implement proper signal handling and logging during shutdown.
- Transitioned database operations to an asynchronous model in `async_db.py`, improving performance and responsiveness.
- Updated database schema to support new foreign key relationships and optimized indexing for better query performance.
- Enhanced various bot handlers to utilize async database methods, improving overall efficiency and user experience.
- Removed obsolete database and fix scripts to streamline the project structure.

database/__init__.py

@@ -0,0 +1,26 @@
+"""
+Пакет для работы с базой данных.
+
+Содержит:
+- models: модели данных
+- base: базовый класс для работы с БД
+- repositories: репозитории для разных сущностей
+- repository_factory: фабрика репозиториев
+- async_db: основной класс AsyncBotDB
+"""
+
+from .models import (
+    User, BlacklistUser, UserMessage, TelegramPost, PostContent,
+    MessageContentLink, Admin, Migration, AudioMessage, AudioListenRecord, AudioModerate
+)
+from .repository_factory import RepositoryFactory
+from .base import DatabaseConnection
+from .async_db import AsyncBotDB
+
+# Для обратной совместимости экспортируем старый интерфейс
+__all__ = [
+    'User', 'BlacklistUser', 'UserMessage', 'TelegramPost', 'PostContent',
+    'MessageContentLink', 'Admin', 'Migration', 'AudioMessage', 'AudioListenRecord', 'AudioModerate',
+    'RepositoryFactory', 'DatabaseConnection', 'AsyncBotDB'
+]
+