Rename email templates to follow a consistent naming pattern with language
suffix for future i18n support:
- email-validation-email.html -> email-template--email-validation--en.html
- rent-due-email.html -> email-template--rent-due--en.html
- utility-bills-due-email.html -> email-template--util-bills-due--en.html
This naming convention allows for easy addition of Croatian (hr) and other
language versions of the same templates.
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Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
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