docs(backend): clarify domain migration and deletion

[rafaelrcamargo]

Description

Updates the domain API docs to cover the first custom-primary migration and clarify that the active domain cannot be deleted. API signatures and runtime behavior are unchanged.

SDK documentation follow-up for AIE-1691, matching clerk/clerk_go#22073.

Checklist

• pnpm test runs as expected. Full suite not run; all 51 Typedoc tests passed.
• pnpm build runs as expected. Build scoped to Typedoc packages and their dependencies; all passed.
• (If applicable) JSDoc comments have been added or updated for any package exports
• (If applicable) Documentation has been updated. Generated Typedoc output verified.

Type of change

• 🐛 Bug fix
• 🌟 New feature
• 🔨 Breaking change
• 📖 Refactoring / dependency upgrade / documentation
• other:

[changeset-bot]

🦋 Changeset detected

Latest commit: 022f103

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 10 packages

Name	Type
@clerk/backend	Patch
@clerk/astro	Patch
@clerk/express	Patch
@clerk/fastify	Patch
@clerk/hono	Patch
@clerk/nextjs	Patch
@clerk/nuxt	Patch
@clerk/react-router	Patch
@clerk/tanstack-react-start	Patch
@clerk/testing	Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Actions	Updated
clerk-js-sandbox	Ready	Preview	Sep 11, 2026 11:31pm UTC
swingset	Ready	Preview	Sep 11, 2026 11:31pm UTC

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commit: 022f103