fix: AttributeTabContent React key prop 에러 수정

- property.id → property.key로 변경
- Object.entries()로 생성된 배열에는 id가 없고 key만 존재

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/components/items/ItemMasterDataManagement/components/AttributeTabContent.tsx

@@ -206,7 +206,7 @@ export function AttributeTabContent({
             const inputTypeLabel = getInputTypeLabel(property.type);
 
             return (
-              <div key={property.id} className="p-4 border rounded hover:bg-gray-50 transition-colors">
+              <div key={property.key} className="p-4 border rounded hover:bg-gray-50 transition-colors">
                 <div className="flex items-start justify-between gap-3">
                   <div className="flex-1 space-y-2">
                     <div className="flex items-center gap-2">