Complete migration of all admin API endpoints from clubs to facilities nomenclature:
**Admin Endpoint Changes:**
- GET /admin/clubs → GET /admin/facilities
- GET /admin/clubs/{id} → GET /admin/facilities/{id}
- All 30+ admin routes migrated from /clubs/ to /facilities/
**API Client Files Updated:**
- admin-clubs.ts: List and detail endpoints (2 endpoints)
- materialisation.ts: Materialization status and trigger (2 endpoints)
- slot-definitions.ts: All CRUD operations (6 endpoints)
- courts.ts: Court management and profile (7 endpoints)
- admin-api.ts: TypeScript documentation comments (7 updates)
**Total Changes:**
- 28 endpoint path replacements across 5 files
- All /admin/clubs references removed
- Comments and documentation updated
**Verification:**
- TypeScript compilation: ✓ No errors
- All admin endpoints now use /admin/facilities
- Fixes 404 errors on admin panel endpoints
BREAKING CHANGES: Requires backend Build 363+ with /admin/facilities endpoints