Added support for PlaceholderAPI expressions as prices — set any item's buy or sell price to a placeholder like %my_papi_value% in the admin editor and it'll be resolved per-player at purchase/sale time. Plain numeric prices still work exactly as before. Currency markers like $ and , in resolved values are stripped automatically; resolution failures fall back to the numeric price safely
Security
Fixed a potential free-items exploit on Vault economy providers that allow zero-amount withdraws: items set to "sell only" (buy price 0) could be acquired for free via the buy menu. The shop now refuses to open the buy menu for sell-only items regardless of which economy provider is installed