update item data

pkg/data/data.go

@@ -100,6 +100,13 @@ func (r Room) IsInside(p Position) bool {
 	return false
 }
 
+func (d Data) MercHPPercent() int {
+	if d.Mercenary.Found {
+		return d.Mercenary.HPPercent
+	}
+	return 0
+}
+
 type RosterMember struct {
 	Name     string
 	Area     area.ID