feat(boxing): support editing assigned box records

- Save API URL and sound paths in a single load-modify-write cycle to
  prevent race conditions that wiped previously saved config
- Strip trailing slashes from API URL to avoid double-slash 404 errors
- Make AppConfigService.saveConfig public for batch config writes

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

lib/pages/boxing_detail_page.dart

@@ -22,9 +22,10 @@ class BoxingDetailPage extends StatelessWidget {
             Expanded(
               child: Text(
                 paichanNo,
+                textAlign: TextAlign.end,
                 style: const TextStyle(
-                  fontSize: 14,
-                  fontWeight: FontWeight.normal,
+                  fontSize: 18,
+                  fontWeight: FontWeight.bold,
                 ),
                 overflow: TextOverflow.ellipsis,
               ),
@@ -60,14 +61,37 @@ class BoxingDetailPage extends StatelessWidget {
   }
 
   Widget _buildBoxGroup(BuildContext context, BoxDetailData box) {
+    final boxTotalQuantity = box.items.fold<int>(
+      0,
+      (sum, item) => sum + item.quantity,
+    );
+
     return Padding(
       padding: const EdgeInsets.only(bottom: 12),
       child: Column(
         crossAxisAlignment: CrossAxisAlignment.start,
         children: [
-          Text(
-            '箱号 ${box.boxNo}',
-            style: const TextStyle(fontSize: 14, fontWeight: FontWeight.bold),
+          Row(
+            children: [
+              Expanded(
+                child: Text(
+                  '箱号 ${box.boxNo}',
+                  style: const TextStyle(
+                    fontSize: 14,
+                    fontWeight: FontWeight.bold,
+                  ),
+                ),
+              ),
+              Text(
+                '共 $boxTotalQuantity 件',
+                textAlign: TextAlign.right,
+                style: TextStyle(
+                  fontSize: 14,
+                  fontWeight: FontWeight.w600,
+                  color: Theme.of(context).colorScheme.primary,
+                ),
+              ),
+            ],
           ),
           const SizedBox(height: 4),
           Container(
@@ -102,7 +126,7 @@ class BoxingDetailPage extends StatelessWidget {
                       ),
                       const SizedBox(width: 8),
                       Text(
-                        '数量：${item.quantity}',
+                        '${item.quantity}/${item.totalQuantity ?? '--'}',
                         style: const TextStyle(fontSize: 14),
                       ),
                     ],

lib/pages/registration_page.dart

@@ -49,8 +49,7 @@ class _RegistrationPageState extends State<RegistrationPage> {
   }
 
   void _onKeyEvent(KeyEvent event) {
-    if (event is KeyDownEvent &&
-        event.logicalKey == LogicalKeyboardKey.enter) {
+    if (event is KeyDownEvent && event.logicalKey == LogicalKeyboardKey.enter) {
       _submit();
     }
   }
@@ -195,11 +194,24 @@ class _RegistrationPageState extends State<RegistrationPage> {
           _locationType = null;
         }
       });
-      final msg = _isLocked ? '货位已锁定，请扫描下一张执行卡' : '上架成功';
-      _showStatusOverride(msg, StatusDotColor.green, const Duration(milliseconds: 1500));
+      final msg = result.isOffShelfSuccess
+          ? '下架成功'
+          : (_isLocked ? '货位已锁定，请扫描下一张执行卡' : '上架成功');
+      _showStatusOverride(
+        msg,
+        StatusDotColor.green,
+        const Duration(milliseconds: 1500),
+      );
     } else if (result.isDuplicate) {
       _feedbackService.trigger(FeedbackEvent.duplicateError);
       _showDuplicateDialog(zongpaiNo, result.duplicateInfo);
+    } else if (result.isAlreadyOffShelf) {
+      _feedbackService.trigger(FeedbackEvent.submitFailure);
+      _showStatusOverride(
+        result.errorMessage ?? '该总排号已下架至转运区域，不可重新上架',
+        StatusDotColor.red,
+        const Duration(seconds: 2),
+      );
     } else {
       final isNetwork = result.errorMessage == '网络异常，请检查网络连接';
       _feedbackService.trigger(
@@ -215,6 +227,7 @@ class _RegistrationPageState extends State<RegistrationPage> {
 
   Future<void> _submitBatch(String baseUrl) async {
     int successCount = 0;
+    int offShelfCount = 0;
     final failed = <String>[];
     final toRemove = <String>[];
 
@@ -226,6 +239,9 @@ class _RegistrationPageState extends State<RegistrationPage> {
       );
       if (result.success) {
         successCount++;
+        if (result.isOffShelfSuccess) {
+          offShelfCount++;
+        }
         toRemove.add(zp);
       } else {
         failed.add(zp);
@@ -238,6 +254,19 @@ class _RegistrationPageState extends State<RegistrationPage> {
           _showDuplicateDialog(zp, result.duplicateInfo);
           return;
         }
+        if (result.isAlreadyOffShelf) {
+          setState(() {
+            _zongpaiNos.removeWhere((e) => toRemove.contains(e));
+            _isSubmitting = false;
+          });
+          _feedbackService.trigger(FeedbackEvent.submitFailure);
+          _showStatusOverride(
+            result.errorMessage ?? '该总排号已下架至转运区域，不可重新上架',
+            StatusDotColor.red,
+            const Duration(seconds: 2),
+          );
+          return;
+        }
       }
     }
 
@@ -250,8 +279,11 @@ class _RegistrationPageState extends State<RegistrationPage> {
 
     if (failed.isEmpty) {
       _feedbackService.trigger(FeedbackEvent.submitSuccess);
+      final msg = offShelfCount == successCount
+          ? '批量下架成功（$successCount 条）'
+          : '批量上架成功（$successCount 条）';
       _showStatusOverride(
-        '批量上架成功（$successCount 条）',
+        msg,
         StatusDotColor.green,
         const Duration(milliseconds: 1500),
       );
@@ -492,7 +524,9 @@ class _RegistrationPageState extends State<RegistrationPage> {
                                 width: double.infinity,
                                 padding: const EdgeInsets.all(14),
                                 decoration: BoxDecoration(
-                                  border: Border.all(color: Colors.grey.shade400),
+                                  border: Border.all(
+                                    color: Colors.grey.shade400,
+                                  ),
                                   borderRadius: BorderRadius.circular(8),
                                 ),
                                 child: const Text(
@@ -509,7 +543,9 @@ class _RegistrationPageState extends State<RegistrationPage> {
                                     const SizedBox(height: 6),
                                 itemBuilder: (context, index) {
                                   return Dismissible(
-                                    key: ValueKey('${_zongpaiNos[index]}-$index'),
+                                    key: ValueKey(
+                                      '${_zongpaiNos[index]}-$index',
+                                    ),
                                     direction: DismissDirection.endToStart,
                                     onDismissed: (_) => _removeZongpai(index),
                                     background: Container(

lib/pages/settings_page.dart

@@ -57,14 +57,27 @@ class _SettingsPageState extends State<SettingsPage> {
   }
 
   Future<void> _saveUrl() async {
-    final url = _controller.text.trim();
+    final url = _controller.text.trim().replaceAll(RegExp(r'/+$'), '');
     if (url.isEmpty) {
       _showSnackBar('请输入 API 地址', isError: true);
       return;
     }
     setState(() => _saving = true);
+    // Load config once, apply all changes, then save once to avoid race conditions
     final configService = AppConfigService();
-    await configService.setString('api_url', url);
+    final config = await configService.loadConfig();
+    config['api_url'] = url;
+    if (_successPath != null) config['sound_success'] = _successPath;
+    else config.remove('sound_success');
+    if (_failurePath != null) config['sound_failure'] = _failurePath;
+    else config.remove('sound_failure');
+    if (_beepPath != null) config['sound_beep'] = _beepPath;
+    else config.remove('sound_beep');
+    if (_errorPath != null) config['sound_error'] = _errorPath;
+    else config.remove('sound_error');
+    if (_alertPath != null) config['sound_alert'] = _alertPath;
+    else config.remove('sound_alert');
+    await configService.saveConfig(config);
     setState(() => _saving = false);
     if (mounted) {
       _showSnackBar('设置已保存');
@@ -91,18 +104,6 @@ class _SettingsPageState extends State<SettingsPage> {
     );
     if (result != null && result.files.single.path != null) {
       final path = result.files.single.path!;
-      switch (key) {
-        case 'success':
-          await _soundService.setSuccessPath(path);
-        case 'failure':
-          await _soundService.setFailurePath(path);
-        case 'beep':
-          await _soundService.setBeepPath(path);
-        case 'error':
-          await _soundService.setErrorPath(path);
-        case 'alert':
-          await _soundService.setAlertPath(path);
-      }
       setState(() {
         switch (key) {
           case 'success':
@@ -121,18 +122,6 @@ class _SettingsPageState extends State<SettingsPage> {
   }
 
   Future<void> _clearSound(String key) async {
-    switch (key) {
-      case 'success':
-        await _soundService.setSuccessPath(null);
-      case 'failure':
-        await _soundService.setFailurePath(null);
-      case 'beep':
-        await _soundService.setBeepPath(null);
-      case 'error':
-        await _soundService.setErrorPath(null);
-      case 'alert':
-        await _soundService.setAlertPath(null);
-    }
     setState(() {
       switch (key) {
         case 'success':

lib/services/api_service.dart

@@ -5,23 +5,41 @@ import 'package:http/http.dart' as http;
 class RegistrationResult {
   final bool success;
   final bool isDuplicate;
+  final bool isAlreadyOffShelf;
+  final bool isOffShelfSuccess;
   final String? errorMessage;
   final Map<String, dynamic>? duplicateInfo;
+  final Map<String, dynamic>? conflictInfo;
 
   RegistrationResult({
     required this.success,
     this.isDuplicate = false,
+    this.isAlreadyOffShelf = false,
+    this.isOffShelfSuccess = false,
     this.errorMessage,
     this.duplicateInfo,
+    this.conflictInfo,
   });
 
   factory RegistrationResult.ok() => RegistrationResult(success: true);
 
+  factory RegistrationResult.offShelfSuccess() =>
+      RegistrationResult(success: true, isOffShelfSuccess: true);
+
   factory RegistrationResult.duplicate(Map<String, dynamic> info) =>
       RegistrationResult(
         success: false,
         isDuplicate: true,
         duplicateInfo: info,
+        conflictInfo: info,
+      );
+
+  factory RegistrationResult.alreadyOffShelf(Map<String, dynamic> info) =>
+      RegistrationResult(
+        success: false,
+        isAlreadyOffShelf: true,
+        errorMessage: info['message']?.toString() ?? '该总排号已下架至转运区域，不可重新上架',
+        conflictInfo: info,
       );
 
   factory RegistrationResult.error(String message) =>
@@ -32,21 +50,27 @@ class RegistrationResult {
 
 /// 箱号内单个总排号明细
 class BoxItemData {
+  final int? boxItemId;
   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) {
     return BoxItemData(
+      boxItemId: json['box_item_id'] as int?,
       zongpaiNo: json['zongpai_no'] as String,
       workOrderNo: json['work_order_no']?.toString(),
       quantity: json['quantity'] as int,
+      totalQuantity: json['total_quantity'] as int?,
     );
   }
 }
@@ -68,6 +92,27 @@ class BoxDetailData {
   }
 }
 
+/// 当前总排号已分配的装箱明细
+class CurrentZongpaiBoxData {
+  final int boxItemId;
+  final int boxNo;
+  final int quantity;
+
+  CurrentZongpaiBoxData({
+    required this.boxItemId,
+    required this.boxNo,
+    required this.quantity,
+  });
+
+  factory CurrentZongpaiBoxData.fromJson(Map<String, dynamic> json) {
+    return CurrentZongpaiBoxData(
+      boxItemId: json['box_item_id'] as int,
+      boxNo: json['box_no'] as int,
+      quantity: json['quantity'] as int,
+    );
+  }
+}
+
 /// 装箱信息查询结果
 class BoxInfoResult {
   final bool success;
@@ -76,6 +121,7 @@ class BoxInfoResult {
   final String? paichanNo;
   final String? workOrderNo;
   final int? quantity;
+  final List<CurrentZongpaiBoxData> currentZongpaiBoxes;
   final List<BoxDetailData> existingBoxes;
   final int maxBoxNo;
   final int suggestedBoxNo;
@@ -87,6 +133,7 @@ class BoxInfoResult {
     this.paichanNo,
     this.workOrderNo,
     this.quantity,
+    this.currentZongpaiBoxes = const [],
     this.existingBoxes = const [],
     this.maxBoxNo = 0,
     this.suggestedBoxNo = 1,
@@ -98,12 +145,20 @@ class BoxInfoResult {
             ?.map((b) => BoxDetailData.fromJson(b as Map<String, dynamic>))
             .toList() ??
         [];
+    final currentBoxes =
+        (json['current_zongpai_boxes'] as List<dynamic>?)
+            ?.map(
+              (b) => CurrentZongpaiBoxData.fromJson(b as Map<String, dynamic>),
+            )
+            .toList() ??
+        [];
     return BoxInfoResult(
       success: true,
       zongpaiNo: json['zongpai_no'] as String?,
       paichanNo: json['paichan_no'] as String?,
       workOrderNo: json['work_order_no']?.toString(),
       quantity: json['quantity'] as int?,
+      currentZongpaiBoxes: currentBoxes,
       existingBoxes: boxes,
       maxBoxNo: json['max_box_no'] as int? ?? 0,
       suggestedBoxNo: json['suggested_box_no'] as int? ?? 1,
@@ -120,22 +175,33 @@ 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;
 
   BoxSaveResult({
     required this.success,
     this.isDuplicate = false,
     this.errorMessage,
+    this.errorCode,
+    this.boxItemId,
     this.paichanNo,
+    this.zongpaiNo,
     this.boxNo,
+    this.quantity,
   });
 
   factory BoxSaveResult.ok(Map<String, dynamic> json) {
     return 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?,
     );
   }
 
@@ -143,7 +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?,
     );
   }
@@ -153,6 +222,13 @@ class BoxSaveResult {
   }
 }
 
+class BoxDeleteResult {
+  final bool success;
+  final String? errorMessage;
+
+  BoxDeleteResult({required this.success, this.errorMessage});
+}
+
 class ApiService {
   final http.Client _client;
   final Duration timeout;
@@ -181,6 +257,10 @@ class ApiService {
 
       switch (response.statusCode) {
         case 200:
+          final body = jsonDecode(response.body) as Map<String, dynamic>;
+          if (body['previous_location'] != null) {
+            return RegistrationResult.offShelfSuccess();
+          }
           return RegistrationResult.ok();
         case 400:
           final body = jsonDecode(response.body) as Map<String, dynamic>;
@@ -188,7 +268,15 @@ class ApiService {
           return RegistrationResult.error(msg);
         case 409:
           final body = jsonDecode(response.body) as Map<String, dynamic>;
-          return RegistrationResult.duplicate(body);
+          final errorCode = body['error_code']?.toString();
+          if (errorCode == 'DUPLICATE_LOCATION') {
+            return RegistrationResult.duplicate(body);
+          }
+          if (errorCode == 'ALREADY_OFF_SHELF') {
+            return RegistrationResult.alreadyOffShelf(body);
+          }
+          final msg = body['message']?.toString() ?? '提交失败';
+          return RegistrationResult.error(msg);
         default:
           final body = jsonDecode(response.body) as Map<String, dynamic>;
           final msg =
@@ -237,7 +325,6 @@ class ApiService {
     required String zongpaiNo,
     required int boxNo,
     required int quantity,
-    required String boxMode,
   }) async {
     final uri = Uri.parse('$baseUrl/CargoTrace/box');
     try {
@@ -249,7 +336,6 @@ class ApiService {
               'zongpai_no': zongpaiNo,
               'box_no': boxNo,
               'quantity': quantity,
-              'box_mode': boxMode,
             }),
           )
           .timeout(timeout);
@@ -275,6 +361,71 @@ class ApiService {
     }
   }
 
+  /// 更新装箱明细 — PATCH /CargoTrace/box/{boxItemId}
+  Future<BoxSaveResult> updateBoxRecord({
+    required String baseUrl,
+    required int boxItemId,
+    required int boxNo,
+    required int quantity,
+  }) async {
+    final uri = Uri.parse('$baseUrl/CargoTrace/box/$boxItemId');
+    try {
+      final response = await _client
+          .patch(
+            uri,
+            headers: {'Content-Type': 'application/json'},
+            body: jsonEncode({'box_no': boxNo, 'quantity': quantity}),
+          )
+          .timeout(timeout);
+
+      switch (response.statusCode) {
+        case 200:
+          final body = jsonDecode(response.body) as Map<String, dynamic>;
+          return BoxSaveResult.ok(body);
+        case 400:
+          final body = jsonDecode(response.body) as Map<String, dynamic>;
+          final msg = body['message']?.toString() ?? '请求参数错误';
+          return BoxSaveResult.error(msg);
+        case 409:
+          final body = jsonDecode(response.body) as Map<String, dynamic>;
+          return BoxSaveResult.duplicate(body);
+        case 404:
+          return BoxSaveResult.error('指定装箱明细不存在');
+        default:
+          return BoxSaveResult.error('修改失败 (${response.statusCode})');
+      }
+    } catch (e) {
+      return BoxSaveResult.error('网络异常，请检查网络连接');
+    }
+  }
+
+  /// 删除装箱明细 — DELETE /CargoTrace/box/{boxItemId}
+  Future<BoxDeleteResult> deleteBoxRecord({
+    required String baseUrl,
+    required int boxItemId,
+  }) async {
+    final uri = Uri.parse('$baseUrl/CargoTrace/box/$boxItemId');
+    try {
+      final response = await _client
+          .delete(uri, headers: {'Content-Type': 'application/json'})
+          .timeout(timeout);
+
+      switch (response.statusCode) {
+        case 200:
+          return BoxDeleteResult(success: true);
+        case 404:
+          return BoxDeleteResult(success: false, errorMessage: '指定装箱明细不存在');
+        default:
+          return BoxDeleteResult(
+            success: false,
+            errorMessage: '删除失败 (${response.statusCode})',
+          );
+      }
+    } catch (e) {
+      return BoxDeleteResult(success: false, errorMessage: '网络异常，请检查网络连接');
+    }
+  }
+
   /// Test connectivity by making a HEAD request to the base URL.
   Future<bool> testConnection(String baseUrl) async {
     try {

lib/services/app_config_service.dart

@@ -38,11 +38,11 @@ class AppConfigService {
   Future<void> setString(String key, String value) async {
     final config = await loadConfig();
     config[key.toString()] = value.toString();
-    await _saveConfig(config);
+    await saveConfig(config);
   }
 
   /// 完整写入 JSON 文件
-  Future<void> _saveConfig(Map<String, dynamic> config) async {
+  Future<void> saveConfig(Map<String, dynamic> config) async {
     try {
       final file = File(await _filePath);
       await file.writeAsString(jsonEncode(config));

lib/services/boxing_context.dart

@@ -0,0 +1,38 @@
+enum PaichanContextChange { firstScan, samePaichan, switchedPaichan }
+
+class PaichanContextDecision {
+  final PaichanContextChange change;
+  final int? boxNoToApply;
+
+  const PaichanContextDecision({required this.change, this.boxNoToApply});
+
+  bool get isSwitched => change == PaichanContextChange.switchedPaichan;
+}
+
+PaichanContextDecision decideMultiCodePaichanContext({
+  required String? lastPaichanNo,
+  required String? currentPaichanNo,
+  required String currentBoxNoText,
+  required int maxBoxNo,
+}) {
+  final recommendedBoxNo = maxBoxNo + 1;
+  if (currentPaichanNo == null || currentPaichanNo.isEmpty) {
+    return const PaichanContextDecision(change: PaichanContextChange.firstScan);
+  }
+  if (lastPaichanNo == null || lastPaichanNo.isEmpty) {
+    return PaichanContextDecision(
+      change: PaichanContextChange.firstScan,
+      boxNoToApply: currentBoxNoText.trim().isEmpty ? recommendedBoxNo : null,
+    );
+  }
+  if (lastPaichanNo == currentPaichanNo) {
+    return PaichanContextDecision(
+      change: PaichanContextChange.samePaichan,
+      boxNoToApply: currentBoxNoText.trim().isEmpty ? recommendedBoxNo : null,
+    );
+  }
+  return PaichanContextDecision(
+    change: PaichanContextChange.switchedPaichan,
+    boxNoToApply: recommendedBoxNo,
+  );
+}

lib/services/feedback_service.dart

@@ -11,6 +11,7 @@ enum FeedbackEvent {
   networkError, // Network error         → failure sound + short vibrate
   duplicateBoxNo, // Duplicate box no     → failure sound + short vibrate
   modeSwitch, // Mode toggle           → beep only
+  paichanSwitch, // Paichan changed      → beep + short vibrate
 }
 
 /// Centralized feedback dispatcher.
@@ -56,6 +57,10 @@ class FeedbackService {
 
       case FeedbackEvent.modeSwitch:
         _soundService.playBeep();
+
+      case FeedbackEvent.paichanSwitch:
+        _soundService.playBeep();
+        _vibrateShort();
     }
   }
 

test/services/api_service_test.dart

@@ -8,7 +8,11 @@ void main() {
     test('returns ok on 200', () async {
       final mockClient = _MockClient((request) async {
         return http.Response(
-          jsonEncode({'zongpai_no': '26B1', 'location_code': 'A01-02-03', 'created_at': '2026-05-11T10:00:00'}),
+          jsonEncode({
+            'zongpai_no': '26B1',
+            'location_code': 'A01-02-03',
+            'created_at': '2026-05-11T10:00:00',
+          }),
           200,
           headers: {'content-type': 'application/json; charset=utf-8'},
         );
@@ -21,16 +25,69 @@ void main() {
       );
       expect(result.success, isTrue);
       expect(result.isDuplicate, isFalse);
+      expect(result.isOffShelfSuccess, isFalse);
     });
 
-    test('returns duplicate on 409 with location_code and registered_at', () async {
+    test('returns off-shelf success on 200 with previous_location', () async {
       final mockClient = _MockClient((request) async {
         return http.Response(
           jsonEncode({
-            'error_code': 'DUPLICATE_LOCATION',
-            'message': '该总排号已存在货位记录',
-            'location_code': 'A01-02-03',
-            'registered_at': '2026-05-11T10:00:00',
+            'zongpai_no': '26B1',
+            'location_code': 'TRANS-01',
+            'previous_location': 'A01-02-03',
+            'created_at': '2026-05-13T10:00:00',
+          }),
+          200,
+          headers: {'content-type': 'application/json; charset=utf-8'},
+        );
+      });
+      final svc = ApiService(client: mockClient);
+      final result = await svc.registerLocation(
+        baseUrl: 'http://localhost',
+        zongpaiNo: '26B1',
+        locationCode: 'TRANS-01',
+      );
+      expect(result.success, isTrue);
+      expect(result.isOffShelfSuccess, isTrue);
+      expect(result.isDuplicate, isFalse);
+    });
+
+    test(
+      'returns duplicate on 409 with location_code and registered_at',
+      () async {
+        final mockClient = _MockClient((request) async {
+          return http.Response(
+            jsonEncode({
+              'error_code': 'DUPLICATE_LOCATION',
+              'message': '该总排号已存在货位记录',
+              'location_code': 'A01-02-03',
+              'registered_at': '2026-05-11T10:00:00',
+            }),
+            409,
+            headers: {'content-type': 'application/json; charset=utf-8'},
+          );
+        });
+        final svc = ApiService(client: mockClient);
+        final result = await svc.registerLocation(
+          baseUrl: 'http://localhost',
+          zongpaiNo: '26B1',
+          locationCode: 'A02-01-01',
+        );
+        expect(result.success, isFalse);
+        expect(result.isDuplicate, isTrue);
+        expect(result.duplicateInfo?['location_code'], 'A01-02-03');
+        expect(result.duplicateInfo?['registered_at'], '2026-05-11T10:00:00');
+      },
+    );
+
+    test('returns already off shelf on 409 ALREADY_OFF_SHELF', () async {
+      final mockClient = _MockClient((request) async {
+        return http.Response(
+          jsonEncode({
+            'error_code': 'ALREADY_OFF_SHELF',
+            'message': '该总排号已下架至转运区域，不可重新上架',
+            'location_code': 'TRANS-01',
+            'registered_at': '2026-05-13T10:00:00',
           }),
           409,
           headers: {'content-type': 'application/json; charset=utf-8'},
@@ -43,15 +100,19 @@ void main() {
         locationCode: 'A02-01-01',
       );
       expect(result.success, isFalse);
-      expect(result.isDuplicate, isTrue);
-      expect(result.duplicateInfo?['location_code'], 'A01-02-03');
-      expect(result.duplicateInfo?['registered_at'], '2026-05-11T10:00:00');
+      expect(result.isDuplicate, isFalse);
+      expect(result.isAlreadyOffShelf, isTrue);
+      expect(result.errorMessage, '该总排号已下架至转运区域，不可重新上架');
+      expect(result.conflictInfo?['location_code'], 'TRANS-01');
     });
 
     test('returns error on 400 with message', () async {
       final mockClient = _MockClient((request) async {
         return http.Response(
-          jsonEncode({'error_code': 'INVALID_ZONGPAI', 'message': 'INVALID_ZONGPAI'}),
+          jsonEncode({
+            'error_code': 'INVALID_ZONGPAI',
+            'message': 'INVALID_ZONGPAI',
+          }),
           400,
           headers: {'content-type': 'application/json; charset=utf-8'},
         );
@@ -81,6 +142,156 @@ void main() {
       expect(result.errorMessage, '网络异常，请检查网络连接');
     });
   });
+
+  group('ApiService boxing APIs', () {
+    test('fetchBoxInfo parses current boxes and box item ids', () async {
+      final mockClient = _MockClient((request) async {
+        return http.Response(
+          jsonEncode({
+            'zongpai_no': '26BW0011',
+            'paichan_no': 'W00009',
+            'work_order_no': '6-1(7)',
+            'quantity': 80,
+            'current_zongpai_boxes': [
+              {'box_item_id': 101, 'box_no': 3, 'quantity': 30},
+            ],
+            'existing_boxes': [
+              {
+                'box_no': 3,
+                'items': [
+                  {
+                    'box_item_id': 101,
+                    'zongpai_no': '26BW0011',
+                    'work_order_no': '6-1(7)',
+                    'quantity': 30,
+                    'total_quantity': 80,
+                  },
+                ],
+              },
+            ],
+            'max_box_no': 3,
+            'suggested_box_no': 4,
+          }),
+          200,
+          headers: {'content-type': 'application/json; charset=utf-8'},
+        );
+      });
+
+      final svc = ApiService(client: mockClient);
+      final result = await svc.fetchBoxInfo(
+        baseUrl: 'http://localhost',
+        zongpaiNo: '26BW0011',
+      );
+
+      expect(result.success, isTrue);
+      expect(result.currentZongpaiBoxes.single.boxItemId, 101);
+      expect(result.existingBoxes.single.items.single.boxItemId, 101);
+      expect(result.existingBoxes.single.items.single.totalQuantity, 80);
+      expect(result.suggestedBoxNo, 4);
+    });
+
+    test('saveBoxRecord sends simplified request body', () async {
+      late Map<String, dynamic> body;
+      final mockClient = _MockClient((request) async {
+        final req = request as http.Request;
+        body = jsonDecode(req.body) as Map<String, dynamic>;
+        return http.Response(
+          jsonEncode({
+            'box_item_id': 102,
+            'paichan_no': 'W00009',
+            'box_no': 4,
+            'zongpai_no': '26BW0012',
+            'quantity': 34,
+            'created_at': '2026-05-13T10:00:00',
+          }),
+          200,
+          headers: {'content-type': 'application/json; charset=utf-8'},
+        );
+      });
+
+      final svc = ApiService(client: mockClient);
+      final result = await svc.saveBoxRecord(
+        baseUrl: 'http://localhost',
+        zongpaiNo: '26BW0012',
+        boxNo: 4,
+        quantity: 34,
+      );
+
+      expect(result.success, isTrue);
+      expect(result.boxItemId, 102);
+      expect(result.zongpaiNo, '26BW0012');
+      expect(body, {'zongpai_no': '26BW0012', 'box_no': 4, 'quantity': 34});
+      expect(body.containsKey('box_mode'), isFalse);
+    });
+
+    test('updateBoxRecord sends simplified request body', () async {
+      late Map<String, dynamic> body;
+      final mockClient = _MockClient((request) async {
+        final req = request as http.Request;
+        body = jsonDecode(req.body) as Map<String, dynamic>;
+        return http.Response(
+          jsonEncode({
+            'box_item_id': 102,
+            'paichan_no': 'W00009',
+            'box_no': 4,
+            'zongpai_no': '26BW0012',
+            'quantity': 20,
+            'updated_at': '2026-05-13T10:00:00',
+          }),
+          200,
+          headers: {'content-type': 'application/json; charset=utf-8'},
+        );
+      });
+
+      final svc = ApiService(client: mockClient);
+      final result = await svc.updateBoxRecord(
+        baseUrl: 'http://localhost',
+        boxItemId: 102,
+        boxNo: 4,
+        quantity: 20,
+      );
+
+      expect(result.success, isTrue);
+      expect(body, {'box_no': 4, 'quantity': 20});
+      expect(body.containsKey('box_mode'), isFalse);
+    });
+
+    test('deleteBoxRecord handles success and not found', () async {
+      var calls = 0;
+      final mockClient = _MockClient((request) async {
+        calls += 1;
+        if (calls == 1) {
+          return http.Response(
+            jsonEncode({'box_item_id': 102, 'deleted': true}),
+            200,
+            headers: {'content-type': 'application/json; charset=utf-8'},
+          );
+        }
+        return http.Response(
+          jsonEncode({
+            'error_code': 'BOX_ITEM_NOT_FOUND',
+            'message': '指定装箱明细不存在',
+          }),
+          404,
+          headers: {'content-type': 'application/json; charset=utf-8'},
+        );
+      });
+
+      final svc = ApiService(client: mockClient);
+      final ok = await svc.deleteBoxRecord(
+        baseUrl: 'http://localhost',
+        boxItemId: 102,
+      );
+      final missing = await svc.deleteBoxRecord(
+        baseUrl: 'http://localhost',
+        boxItemId: 999,
+      );
+
+      expect(ok.success, isTrue);
+      expect(missing.success, isFalse);
+      expect(missing.errorMessage, '指定装箱明细不存在');
+    });
+  });
 }
 
 class _MockClient extends http.BaseClient {

test/services/boxing_context_test.dart

@@ -0,0 +1,60 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:pad_scanner/services/boxing_context.dart';
+
+void main() {
+  group('decideMultiCodePaichanContext', () {
+    test('first scan records context and fills recommended box if empty', () {
+      final decision = decideMultiCodePaichanContext(
+        lastPaichanNo: null,
+        currentPaichanNo: 'W00009',
+        currentBoxNoText: '',
+        maxBoxNo: 3,
+      );
+
+      expect(decision.change, PaichanContextChange.firstScan);
+      expect(decision.boxNoToApply, 4);
+      expect(decision.isSwitched, isFalse);
+    });
+
+    test('same paichan keeps current box number', () {
+      final decision = decideMultiCodePaichanContext(
+        lastPaichanNo: 'W00009',
+        currentPaichanNo: 'W00009',
+        currentBoxNoText: '8',
+        maxBoxNo: 3,
+      );
+
+      expect(decision.change, PaichanContextChange.samePaichan);
+      expect(decision.boxNoToApply, isNull);
+      expect(decision.isSwitched, isFalse);
+    });
+
+    test('switched paichan resets to new paichan max box plus one', () {
+      final decision = decideMultiCodePaichanContext(
+        lastPaichanNo: 'W00009',
+        currentPaichanNo: 'W00010',
+        currentBoxNoText: '8',
+        maxBoxNo: 1,
+      );
+
+      expect(decision.change, PaichanContextChange.switchedPaichan);
+      expect(decision.boxNoToApply, 2);
+      expect(decision.isSwitched, isTrue);
+    });
+
+    test(
+      'same paichan defensively fills recommended box when box is empty',
+      () {
+        final decision = decideMultiCodePaichanContext(
+          lastPaichanNo: 'W00009',
+          currentPaichanNo: 'W00009',
+          currentBoxNoText: '',
+          maxBoxNo: 4,
+        );
+
+        expect(decision.change, PaichanContextChange.samePaichan);
+        expect(decision.boxNoToApply, 5);
+      },
+    );
+  });
+}