Domain path widget labels missing path prefix when alias_title is set to URL

Problem

When Domain module's path prefix feature is enabled (allowing multiple domains to share a single hostname differentiated by a path prefix), the Domain Path widget labels have two issues:

1. Hostname labels don't distinguish prefixed domains — When alias_title is set to hostname, domains sharing the same hostname but with different prefixes are indistinguishable (both show example.com). The prefix should be appended to produce example.com/fr.
2. Pathauto widget ignores alias_title setting — DomainPathautoWidget::formElement() always uses getPath() for the "Generate automatic URL alias for @domain" checkbox label, ignoring the alias_title config setting that the parent DomainPathWidget respects.

Steps to reproduce

1. Enable Domain module's path prefix support at /admin/config/domain/settings
2. Create two domains sharing the same hostname — one without a prefix and one with prefix fr
3. Set Domain Path's alias_title to hostname at /admin/config/domain_path/settings — both domains show the same hostname with no way to tell them apart
4. Enable domain_path_pathauto — the checkbox label always shows the URL regardless of the alias_title setting

Fix

1. Append prefix to hostname labels — DomainPathWidget and DomainPathautoWidget now append the path prefix to the hostname when alias_title === 'hostname' (e.g., example.com/fr).
2. Pathauto widget respects alias_title — DomainPathautoWidget::formElement() now reads the alias_title setting to choose between domain name, hostname, or URL — consistent with the parent widget.
3. Update radio button label — The hostname option in DomainPathSettingsForm now reads "The raw hostname (with path prefix if set)".