feat(examples): add ZeptoMail example
Merged
MM
2mo ago+81+81+01234567890123456789-0-0-0123456789
Adds a ZeptoMail example under examples/zeptomail, mirroring the existing provider examples (Brevo, Mailtrap, Mailchimp Transactional). Same shared Email template and render call as the others; src/index.tsx sends through ZeptoMail's SendMailClient.sendMail with htmlbody. Uses zeptomail 8.0.1. Builds with the same tsdown script as the sibling examples.