优化价格展示

lib/widget/live/live_room_pay_item.dart

@@ -70,7 +70,7 @@ class _LiveRoomPayItemState extends State<LiveRoomPayItem> {
                   ),
                 ),
                 Text(
-                  "${(widget.item["price"] as num?)?.toStringAsFixed(0) ?? '0.0'}元",
+                  "${(widget.item["price"])?.toStringAsFixed(2) ?? '0.00'}元",
                   style: TextStyle(
                     fontSize: 11.w,
                     color: const Color.fromRGBO(144, 144, 144, 1),