- _render_message: leeren style-Tag vermieden (MarkupError bei inbound-Msgs)
- Nachrichtentext: eckige Klammern werden escaped (kein Markup-Injection)
- get_by_phone: sucht +49xxx und 49xxx gleichzeitig (Green API liefert ohne +)
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.