Replace a facility's supporting documents

Replaces the complete set of supporting documents for the specified facility — this is a full-array replace, not a per-item update-or-delete operation. There is no action field on the request items; every submitted item is written as-is, and any existing document not present in the submitted array is removed. To remove one document, resend the full array with that item omitted; to remove all documents, submit an empty array. The underlying stored file is never deleted from GCS by this call — only the metadata entry is removed from the facility's document list, so the file itself remains in storage. To attach a new document without affecting existing ones, use POST /facilities/{id}/supporting-documents instead, which appends rather than replaces.