btc.us website does not work for non .btc namespaces

BNS supports multiple different domains (.id, .stx, .btc, .app etc)

the btc.us website only allows transferring and management of .btc domains

Trying to manage or transfer anything that is not .btc fails, and the domain status never loads

```
GET https://gaia.blockstack.org/hub/1LmWAN5djYyqLYgE36MhNQHYsFdjFZVjUH/btc_SP2F40S465JTD7AMZ2X9SMN229617HZ9YB0HHY98A.json 404

POST https://pay.btc.us/v1/update-transfer-domain-data 404 (Not Found)
Body:
{"address":"src","targetAddress":"target","domain":"jake"}
```

Start by reproducing management and transfer for a non-.btc BNS domain such as .id or .stx, then trace the frontend requests to the Gaia hub and pay.btc.us endpoints shown in the report. Done means domain status loads and non-.btc domains can be managed and transferred without the reported 404 responses.

Written by the indexing model from the issue text.