Use TYPE_URL instead of TYPE_CONTENT as default language method

Problem

DomainPathAliasManager has a configurable language_method setting, but both the code fallback and the install config default to language_content (TYPE_CONTENT). The default should be language_url (TYPE_URL) to match core behavior.

Core's AliasManager::getAliasByPath() explicitly defaults to TYPE_URL with this rationale:

If no language is explicitly specified we default to the current URL language. If we used a language different from the one conveyed by the requested URL, we might end up being unable to check if there is a path alias matching the URL path.

Proposed fix

• Change the fallback default from TYPE_CONTENT to TYPE_URL in both getPathByAliasAndDomain() and getAliasByPathAndDomain()
• Change domain_path.settings.yml install default from language_content to language_url