Document domain split migration plan

[AnthonyRonning]

Summary

• add a comprehensive domain split migration plan for Maple
• capture the phased marketing, auth-broker, and app-host migration strategy
• document route ownership, rollout sequencing, testing, rollback, and SEO considerations

Testing

• prettier --check docs/domain-split-migration-plan.md
• pre-commit hook checks (Prettier, build, bun test)

[coderabbitai]

Important

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/domain-migration-plan

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[cloudflare-workers-and-pages]

Deploying maple with    Cloudflare Pages

Latest commit:	1d6b55d
Status:	✅  Deploy successful!
Preview URL:	https://81463c14.maple-ca8.pages.dev
Branch Preview URL:	https://docs-domain-migration-plan.maple-ca8.pages.dev

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