fix(websites): alias DomainNamespace to generated enum

[pcfreak30]

Aliases DomainNamespace to the generated DomainResponseNamespace
instead of duplicating it as a standalone string type, and points its
constants at the generated enum values. DomainNamespaceOf now returns
the response field directly.

---

The DomainNamespace type has been updated to alias the generated internalclient.DomainResponseNamespace enum instead of being a standalone string type. This change ensures that domain namespaces always match the client’s API values and reduces the risk of drift or invalid values.

Key modifications:

• DomainNamespace is now a type alias to internalclient.DomainResponseNamespace.
• The constants DomainNamespaceICANN and DomainNamespaceHNS now reference the corresponding generated enum values (DomainResponseNamespaceIcann and DomainResponseNamespaceHns).
• DomainNamespaceOf now returns the namespace directly from the response without an explicit cast, since it is already the correct type.

This makes the SDK more consistent with the underlying API and removes the need for manual conversion.

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Code Coverage Report

Total Coverage: 13.5%

Generated from commit: f934b77
Repository: LumeWeb/ipfs-sdk