Local-only Foscam R2 control: CLI + web viewer, credential-free proxy streams, PTZ patrol, recording — no cloud, no apps

Raspberry Pi 4B doorbell demo as a mini-project for IFB102. The program uses OpenCV for detection, with a Logitech HD Webcam C270, Twilio for messaging via WhatsApp for notifications, and Cloudflare R2 for image storage and fetching.