Expose listing and metrics currencies

Currency is now returned explicitly so monetary values can be interpreted correctly.

get_listing_data

  • Each listing now includes currency: the listing’s current pricing currency (used for min/base/max and related pricing fields).

get_listing_performance_metrics

  • data.listing_level.currency: currency used for monetary listing-level KPIs.
  • data.market_level.currency: currency used for monetary market-level KPIs.

These metric currencies describe their respective stored metric sets and may differ from each other or from the listing’s current pricing currency returned by get_listing_data.