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feat: add postListing/postOffer API methods, deprecate legacy order endpoints (#1936)

* feat: migrate from deprecated order response to v2 listing/offer types

The os2-core POST listing/offer endpoints now return both a deprecated
`order` field and new `listing`/`offer` fields with the v2 response
format. This PR migrates the SDK to read from the new fields.

BREAKING CHANGES:
- `createListing` now returns `Listing` instead of `OrderV2`
- `createOffer` now returns `Offer` instead of `OrderV2`
- `createBulkListings` returns `BulkListingResult` instead of `BulkOrderResult`
- `createBulkOffers` returns `BulkOfferResult` instead of `BulkOrderResult`
- New `postListing`/`postOffer` API methods replace deprecated `postOrder`
- GET orders endpoints (`getOrder`/`getOrders`) marked as deprecated

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* refactor: add new postListing/postOffer API methods (non-breaking)

Add new API methods that return native Listing/Offer types from the
upcoming os2-core response format changes. Existing methods and return
types are preserved — consumers can migrate at their own pace.

- Add postListing() and postOffer() on OpenSeaAPI and OrdersAPI
- Add ListingPostQueryResponse and OfferPostQueryResponse types
- Mark deprecated methods with @deprecated JSDoc annotations

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

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Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

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