#317 fix(domains): correct mutation response types

What

Correct the return types of Domains.update, Domains.verify, and Domains.remove, including their async variants.

Why

The SDK types these responses as a full Domain. A caller can read Domains.verify(id)["status"] without a type error, but the API response has no status and the lookup can raise KeyError.

How

• Match the documented update, verify, and delete response shapes. Update the examples to use those types.
• This follows #159's correction to the domain creation response type.

Testing

• Sync and async tests use the documented response shapes and assert the inferred types.
• tox -e lint,mypy,py passed (862 tests).

Notes for reviewers

This narrows the public type annotations. The request and response data are unchanged. Use Domains.get() to read the current status.

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Summary by cubic

Corrects the return types of Domains.update, Domains.verify, and Domains.remove (sync and async) to match the documented API response shapes. Previously these were typed as a full Domain, so callers could read fields like status that aren't in the response and hit a KeyError.

• Adds UpdateDomainResponse, VerifyDomainResponse, and RemoveDomainResponse types with only the fields the API actually returns.
• Updates tests and examples to use the new types and assert them via assert_type.
• Use Domains.get() to read a domain's current status; the request and response payloads are unchanged.