feat(examples): add Mailchimp Transactional example

[mmaxence]

Adds an example showing how to send a react-email template through Mailchimp's Transactional API (Mandrill), using the official @mailchimp/mailchimp_transactional SDK.

Follows the structure of the existing brevo and mailtrap examples: render the template, pass the HTML to messages.send. The SDK is a generated client and ships no bundled types, so I pinned the DefinitelyTyped @types/mailchimp__mailchimp_transactional and verified the call shape against those types.

Happy to add other providers if useful.

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Summary by cubic

Adds an example for sending a react-email template via Mailchimp Transactional (Mandrill) using the official @mailchimp/mailchimp_transactional SDK. This extends provider coverage and mirrors existing Brevo/Mailtrap examples.

• Renders Email with react-email and passes the HTML to messages.send.
• Uses @mailchimp/mailchimp_transactional@1.4.1 with pinned @types/mailchimp__mailchimp_transactional due to missing bundled types.
• Built with ESM via tsdown targeting Node 20; example requires MAILCHIMP_API_KEY to run.

^{Written for commit 50adcd2. Summary will update on new commits.}

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Latest commit: 50adcd2

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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
	@​types/​mailchimp__mailchimp_transactional@​1.0.12
	@​mailchimp/​mailchimp_transactional@​1.4.1

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