DFD Reservation API

Milestone 1 reservation core for Serenity Reef. All seeded hotel data is explicitly DEMO. No payments or real notifications.

• /admin (central admin UI — test environment)
• /api/health
• /api/health/live
• /api/health/ready
• /api/v1/properties/serenity-reef

Contract: docs/reservation-contract-v1.md