remove the 'localhost' subdomains for universal browser resolution

### Problem description

The following subdomain format that uses localhost in the name (e.g., scan.localhost) is incompatible with:
- Safari
- Java backends
The name resolution doesn't work.

A workaround exists where a developer can edit their /etc/hosts file to add an entry like:
127.0.0.1 scan.localhost

However, with a security conscious organization, the developer may not be able to do that. It also is a pain because new QS users are mystified why the application doesn't work which is a bad first experience.

Start by locating where the scan.localhost subdomain is configured and how the quickstart exposes it. Check resolution in Safari and with Java backends, then verify the application works without requiring a /etc/hosts entry.

Written by the indexing model from the issue text.