feat(boxing): update many-to-one packing flow

lib/services/api_service.dart

@@ -54,12 +54,14 @@ class BoxItemData {
   final String zongpaiNo;
   final String? workOrderNo;
   final int quantity;
+  final int? totalQuantity;
 
   BoxItemData({
     this.boxItemId,
     required this.zongpaiNo,
     this.workOrderNo,
     required this.quantity,
+    this.totalQuantity,
   });
 
   factory BoxItemData.fromJson(Map<String, dynamic> json) {
@@ -68,6 +70,7 @@ class BoxItemData {
       zongpaiNo: json['zongpai_no'] as String,
       workOrderNo: json['work_order_no']?.toString(),
       quantity: json['quantity'] as int,
+      totalQuantity: json['total_quantity'] as int?,
     );
   }
 }
@@ -172,8 +175,10 @@ class BoxSaveResult {
   final bool success;
   final bool isDuplicate;
   final String? errorMessage;
+  final String? errorCode;
   final int? boxItemId;
   final String? paichanNo;
+  final String? zongpaiNo;
   final int? boxNo;
   final int? quantity;
 
@@ -181,8 +186,10 @@ class BoxSaveResult {
     required this.success,
     this.isDuplicate = false,
     this.errorMessage,
+    this.errorCode,
     this.boxItemId,
     this.paichanNo,
+    this.zongpaiNo,
     this.boxNo,
     this.quantity,
   });
@@ -192,6 +199,7 @@ class BoxSaveResult {
       success: true,
       boxItemId: json['box_item_id'] as int?,
       paichanNo: json['paichan_no'] as String?,
+      zongpaiNo: json['zongpai_no'] as String?,
       boxNo: json['box_no'] as int?,
       quantity: json['quantity'] as int?,
     );
@@ -201,7 +209,10 @@ class BoxSaveResult {
     return BoxSaveResult(
       success: false,
       isDuplicate: true,
+      errorCode: json['error_code']?.toString(),
+      errorMessage: json['message']?.toString(),
       paichanNo: json['paichan_no'] as String?,
+      zongpaiNo: json['zongpai_no'] as String?,
       boxNo: json['box_no'] as int?,
     );
   }
@@ -358,6 +369,7 @@ class ApiService {
     required int boxItemId,
     required int boxNo,
     required int quantity,
+    String boxMode = 'one-to-many',
   }) async {
     final uri = Uri.parse('$baseUrl/CargoTrace/box/$boxItemId');
     try {
@@ -368,7 +380,7 @@ class ApiService {
             body: jsonEncode({
               'box_no': boxNo,
               'quantity': quantity,
-              'box_mode': 'one-to-many',
+              'box_mode': boxMode,
             }),
           )
           .timeout(timeout);