docs(guides): add domain setup workflows

[aryasaatvik]

Summary

• add a runnable Effect quickstart and task-oriented setup guides
• document provider authorization, provisioning, verification, cleanup, and host integration levels
• add reusable docs components for provider cards and marks
• align the package READMEs with the documented integration path

choose integration level
  -> connect provider
  -> review and apply DNS plan
  -> verify records
  -> observe lifecycle or clean up

Validation

• executable core quickstart
• core package build
• isolated 28-page docs build
• repository lint and format checks

The already-running docs development server was left untouched.

[github-actions]

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Release preview

Package	Bump	Version
domainkit	minor	0.3.1 → 0.4.0
@domainkit/react	minor	0.3.1 → 0.4.0

This PR does not add changelog files. Pending changelogs from other branches are included in the preview above.

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_{Managed by Tegami.}

[greptile-apps]

Greptile Summary

The PR expands DomainKit’s documentation into task-oriented workflows and aligns package READMEs with the Effect-first integration path.

• Adds a runnable in-memory provisioning quickstart.
• Documents host integration, provider implementation, observation, provisioning, cleanup, migration, and troubleshooting workflows.
• Adds reusable provider-card and provider-logo documentation components.
• Reorganizes and expands core, React, provider, and package references.

Confidence Score: 5/5

The PR appears safe to merge because no blocking failure remains in the eligible follow-up scope.

No blocking failure remains.

Important Files Changed

Filename	Overview
apps/docs/content/quickstart.mdx	Replaces the introductory example with a complete in-memory Effect workflow that creates, applies, and replans a DNS requirement.
packages/domainkit/examples/effect/quickstart.ts	Adds the executable counterpart to the documentation quickstart using the provider and Web Crypto layers required by provisioning.
apps/docs/content/guides/host-integration.mdx	Documents the server-owned identity, authorization, persistence, transport, and credential boundaries surrounding DomainKit.
apps/docs/content/guides/provision-and-clean-up.mdx	Documents digest-bound plan application, durable receipts, and separately reviewed cleanup.
apps/docs/components.ts	Registers the new provider-card and provider-logo components for global MDX use.
packages/domainkit/README.md	Aligns package installation, entrypoint, ownership, and quickstart guidance with the expanded documentation.
packages/react/README.md	Reframes the React package around complete, focused, composable, and presentation-only integration levels.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart LR
  A[Choose integration level] --> B[Connect provider]
  B --> C[Review DNS plan]
  C --> D[Authorize exact digest]
  D --> E[Apply and persist receipt]
  E --> F[Observe DNS lifecycle]
  E --> G[Create separately authorized cleanup plan]

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