Enhance Telegram bot with database integration and API features

- Added SQLite database support with Alembic for migrations.
- Implemented FastAPI for HTTP API to manage duties.
- Updated configuration to include database URL and HTTP port.
- Created entrypoint script for Docker to handle migrations and permissions.
- Expanded command handlers to register users and display duties.
- Developed a web application for calendar display of duties.
- Included necessary Pydantic schemas and SQLAlchemy models for data handling.
- Updated requirements.txt to include new dependencies for FastAPI and SQLAlchemy.

requirements.txt

@@ -1,2 +1,7 @@
 python-telegram-bot[job-queue]>=22.0,<23.0
 python-dotenv>=1.0,<2.0
+fastapi>=0.115,<1.0
+uvicorn[standard]>=0.32,<1.0
+sqlalchemy>=2.0,<3.0
+alembic>=1.14,<2.0
+pydantic>=2.0,<3.0