Add admin integration

[joshuadavidthomas]

Putting these here for now, will come back and flesh this issue out with details later.

https://tailwindui.com/components/application-ui/page-examples/detail-screens?include=archived#component-2615e1aee7f57fb0fb75b11f8dd99f4e
https://ui.shadcn.com/examples/mail
https://mailtrap.io

[joshuadavidthomas]

Instead of building a custom UI, just leverage the admin.

[joshuadavidthomas]

Will need someway to filter the email messages per application in the admin. Possibly a setting, or if not that an auto generated unique id. Then this will need to be added to the message model so each application only sees its emails in the admin.