Initial MCM project: FastAPI + Textual TUI unified messenger

MultiCustomerMessenger supporting Telegram (python-telegram-bot),
WhatsApp (Green API) and SMS (python-gsmmodem-new). REST API with
Bearer-token auth, SQLAlchemy models for MariaDB, APScheduler for
background polling, and Textual TUI running in same asyncio event-loop.

requirements.txt

@@ -0,0 +1,13 @@
+fastapi>=0.115.0
+uvicorn[standard]>=0.30.0
+pydantic>=2.7.0
+pydantic-settings>=2.3.0
+sqlalchemy>=2.0.30
+PyMySQL>=1.1.0
+cryptography>=42.0.0
+python-telegram-bot[job-queue]>=21.0
+aiohttp>=3.9.0
+python-gsmmodem-new>=0.10
+apscheduler>=3.10.4
+textual>=0.75.0
+python-dotenv>=1.0.0