Adds HORA_INICIO and HORA_FIM environment variables to define the daily
operating window for order sending. Implements dentro_do_horario() function
to validate if current time falls within the configured range. The bot now
pauses order sending outside the operating window and sends a notification
to the chat, resuming automatically at HORA_INICIO.
Includes DEPLOY.md documentation with Debian 12 deployment instructions
and systemd service configuration for auto-start and auto-restart.
