Changes to Returns the resolved configuration for one `(accountId, departmentId)` pair. 404 when the brand has no row — deliberately not a 200 carrying `enabled: false`. The caller treats 404 as "disabled, cache the negative", which is cheaper and unambiguous. A row that was explicitly switched off does return 200 with `enabled: false`.

added the new optional query request parameter roomId

added the optional property botDisplayName to the response with the 200 status (media type: text/plain)

added the optional property botDisplayName to the response with the 200 status (media type: application/json)

added the optional property botDisplayName to the response with the 200 status (media type: text/json)