- Replace all mock tools with real ERPNext Healthcare operations
- ERPNextHealthcare class: patients, practitioners, appointments, schedules
- check_availability queries real practitioner schedules from ERPNext
- create_appointment finds/creates patient + validates conflicts + books in ERPNext
- Add /api/v1/config/test endpoint to validate all service connections
- Add scripts/validate_setup.py for CLI validation of Meta/OpenAI/ERPNext/DB
- Add scripts/seed_knowledge.py with full SKEEN catalog (services, products, packages, FAQ)
- Add tests for webhook, health, and WhatsApp client
- Update main.py to include config router
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