feat: loyalty/discount system with milestone campaigns, auto-redemption, and admin UI
- Database: loyalty_redemptions, discount_campaigns, booking_discounts tables
- Backend: auto-create pending redemption at 10 stamps, apply discounts at completion
- Backend: discount_eligible flag on booking creation (user + admin flows)
- Backend: campaign CRUD handlers (GET/POST/PUT/DELETE + stats)
- Backend: milestone campaigns (per-user, global, anniversary)
- Frontend: customer account page shows 'card full' status at 10 stamps
- Frontend: admin discounts page with campaign management UI
- Frontend: TypeScript types for all discount entities
- Tests: 9 integration tests covering loyalty, campaigns, milestones, edge cases
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