* feat: add handleDeeplink function

* fix: return deeplink response data from handleDeeplink instead of discarding it

The native modules were discarding the actual API response from handleDeeplink
and resolving with a generic {status, message}. Now extracts and returns
deeplink, isLinkrunner, and processing fields — matching the getAttributionData pattern.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

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Co-authored-by: Shofiya <86974918+Shofiya2003@users.noreply.github.com>
Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>