Create a facility for the tenant

Creates a CoreFacility and its TenantFacility association for the tenant (create path; certifyFacilityId is not yet known). Use this to establish a new facility record; use PUT /facilities/{id} instead when the certifyFacilityId is already known. A crosswalk ID is generated from the facility's tenant-scoped identity (NPI+TIN, NCPDP, externalId, or an address hash, depending on tenant identity configuration) — this crosswalk, not any single submitted field, is what the platform treats as the facility's unique identity key. Request body is validated against the facility-upsert JSON Schema and, for tenants configured with isFacilityExternalIdAsCrosswalk=true, against additional externalId/address-hash uniqueness rules (see FacilityValidationService). The primary address, if present, may be standardized via the address cleanser before being persisted. When facility.upsert.sync-survivorship.enabled is true (default), a synchronous (not queued/async) survivorship call is also triggered to the core data layer. Returns HTTP 201 with an ID map only (crosswalkId, corefacilityId, tenantfacilityId, and related batch-alias IDs) — not the full facility object; call GET /facilities/{id} afterwards to read back the created record. See PUT /facilities/{id} for the update path.