Customizing pterodactyl mail

### Is there an existing suggestion for this?

- [x] I have searched the existing issues before opening this suggestion.

### Describe your suggestion

If we can customize the pterodactyl mail from the nova studio would be an amazing addon to the theme

### Describe the solution you'd like

Allow us to embed HTML to be able to customize the pterodactyl mail default template.

### Additional context

_No response_

Start by locating where Nova integrates with Pterodactyl's default mail templates and how those templates are rendered. Define the supported HTML customization entry point and verify that a customized template is used when mail is sent; the issue names no files or tests, so the relevant locations must first be discovered.

Written by the indexing model from the issue text.