feat: update split bill

lib/data/models/response/order_response_model.dart

@@ -244,6 +244,7 @@ class OrderItem {
   DateTime? createdAt;
   DateTime? updatedAt;
   String? printerType;
+  int? paidQuantity;
 
   OrderItem({
     this.id,
@@ -261,6 +262,7 @@ class OrderItem {
     this.createdAt,
     this.updatedAt,
     this.printerType,
+    this.paidQuantity,
   });
 
   factory OrderItem.fromMap(Map<String, dynamic> map) {
@@ -281,6 +283,7 @@ class OrderItem {
       createdAt: DateTime.parse(map['created_at']),
       updatedAt: DateTime.parse(map['updated_at']),
       printerType: map['printer_type'],
+      paidQuantity: map['paid_quantity'],
     );
   }
 
@@ -301,6 +304,7 @@ class OrderItem {
       'created_at': createdAt?.toIso8601String(),
       'updated_at': updatedAt?.toIso8601String(),
       'printer_type': printerType,
+      'paid_quantity': paidQuantity,
     };
   }
 }