KyuubiSoft Core (NPCs, NPC Shops and more)

Added — Shop Sell System

• Item Sell System: Players can sell items at NPC shops
• BUY/SELL tabs in shop (when sellEnabled=true)
• buyEnabled=false for sell-only shops (no BUY tab)
• Configurable sell prices: sellPrice per item or sellPricePercent as fallback
• Whitelist/Blacklist for sellable items
• Daily sell limit: maxSells per item (analog to maxPurchases)
• Sell tab shows ALL sellable items (including items not in inventory, displayed as "Not in inventory")
• Confirmation dialog with quantity selector ([-] Amount [+]) and total price
• Separate sell currency possible (sellCurrencyId)
• Command Purchase: Shop items can execute commands instead of granting items
• command field on ShopItemConfig (e.g. "/give Diamond")
• commandRunAsServer toggle (server/console or player)
• Placeholders: , ,
• Command items are automatically excluded from selling
• Dedicated Buyer NPCs: sellShopId on CitizenData opens shop directly in sell mode
• New Command: /ksshop sell <shopId> opens shop in sell mode (admin testing)

Changed — Shop Admin Panel

• Complete redesign: Shop editor popup removed, everything inline in detail view
• "Add Shop" creates empty shop and opens detail view directly
• Detail view: ID, Title, Currency as editable TextFields
• Buy/Sell toggles side by side
• Sell config inline: Price%, Sell Currency, Whitelist, Blacklist
• Item table: new SELL column (sell price, green)
• Item editor: Sell Price, Max Sells, Command, Run-as fields