Support Woo HPOS

[nhatrangnet]

https://app.asana.com/1/11768486970802/project/1200179452020411/task/1205853327573559

[opencode-agent]

The change adds 'order' (WooCommerce HPOS) to both the parser and unparser's type-handling arrays, following the exact same pattern as 'user' and 'comment'.

No issues found. The change is minimal, consistent with existing patterns, and correctly handles both directions (parse and unparse) of the order type. The object type mapping is bidirectional and the property cleanup (unsetting post_types, taxonomies, settings_pages, priority, style, closed, revision, context, default_hidden) matches the treatment of other non-post object types.

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