feat(ocr, risk): add patient OCR and risk assessment

feat: add ANC visit functionality and improve patient/referral workflows

feat(emergency): implement complete emergency alert system

feat: add core maternal health backend features

feat(contact-us): add contact form submission

feat(email): add Brevo email service with scheduled alerts and notifications

feat(monitoring): add real-time monitoring engine with state management

feat(security): add rate limiting to protect API endpoints

Initial backend deployment with Docker and Cron jobs