feat(examples): add Mailtrap example

[mmaxence]

Adds a Mailtrap example under examples/, following the same shape as the existing Brevo (#3704) and Plunk examples. It renders the email with react-email and sends it through the official mailtrap SDK's send() method. I checked the payload against the SDK's TypeScript types (mailtrap@4.9.0); it typechecks clean and builds with tsdown.

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Summary by cubic

Adds a Mailtrap example under examples/mailtrap that renders an email with react-email and sends it using the official mailtrap SDK. This gives a minimal reference integration without changing existing behavior.

• New example package react-email-with-mailtrap builds with tsdown (ESM, Node 20) and typechecks against mailtrap@4.9.0.
• Requires MAILTRAP_TOKEN; src/index.tsx renders <Email /> and calls MailtrapClient.send().
• All changes are confined to examples/mailtrap; no production code modified.

^{Written for commit d6c04c8. Summary will update on new commits.}

[vercel]

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Latest commit: d6c04c8

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[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	mailtrap@​4.9.0

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