feat: add sound and vibration feedback for registration actions

Integrate audioplayers, vibration, and file_picker packages to provide
audio/haptic feedback on registration success/failure. Add sound
settings UI in SettingsPage for customizing notification sounds.

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

lib/pages/registration_page.dart

@@ -1,8 +1,11 @@
 import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
+import 'package:vibration/vibration.dart';
 import 'package:shared_preferences/shared_preferences.dart';
 import 'package:pad_scanner/services/scanner_service.dart';
 import 'package:pad_scanner/services/code_parser.dart';
 import 'package:pad_scanner/services/api_service.dart';
+import 'package:pad_scanner/services/sound_service.dart';
 import 'package:pad_scanner/pages/settings_page.dart';
 
 class RegistrationPage extends StatefulWidget {
@@ -15,6 +18,8 @@ class RegistrationPage extends StatefulWidget {
 class _RegistrationPageState extends State<RegistrationPage> {
   final _scannerService = ScannerService();
   final _apiService = ApiService();
+  final _soundService = SoundService();
+  final _focusNode = FocusNode();
 
   final _zongpaiNos = <String>[];
   String? _locationCode;
@@ -30,6 +35,23 @@ class _RegistrationPageState extends State<RegistrationPage> {
   void initState() {
     super.initState();
     _scannerService.scanResults.listen(_onScan);
+    WidgetsBinding.instance.addPostFrameCallback((_) {
+      _focusNode.requestFocus();
+    });
+  }
+
+  @override
+  void dispose() {
+    _focusNode.dispose();
+    _soundService.dispose();
+    super.dispose();
+  }
+
+  void _onKeyEvent(KeyEvent event) {
+    if (event is KeyDownEvent &&
+        event.logicalKey == LogicalKeyboardKey.enter) {
+      _submit();
+    }
   }
 
   void _onScan(ScanResult result) {
@@ -137,6 +159,7 @@ class _RegistrationPageState extends State<RegistrationPage> {
     setState(() => _isSubmitting = false);
 
     if (result.success) {
+      _vibrateSuccess();
       setState(() {
         _zongpaiNos.remove(zongpaiNo);
         if (!_isLocked) {
@@ -151,8 +174,10 @@ class _RegistrationPageState extends State<RegistrationPage> {
         if (mounted) setState(() => _successMessage = null);
       });
     } else if (result.isDuplicate) {
+      _vibrateError();
       _showDuplicateDialog(zongpaiNo, result.duplicateInfo);
     } else {
+      _vibrateError();
       _showFeedback(result.errorMessage ?? '提交失败', isError: true);
     }
   }
@@ -193,12 +218,24 @@ class _RegistrationPageState extends State<RegistrationPage> {
     });
 
     if (failed.isEmpty) {
+      _vibrateSuccess();
       _showFeedback('批量上架成功（$successCount 条）', isError: false);
     } else {
+      _vibrateError();
       _showFeedback('成功 $successCount 条，失败 ${failed.length} 条', isError: true);
     }
   }
 
+  void _vibrateSuccess() {
+    Vibration.vibrate(duration: 200);
+    _soundService.playSuccess();
+  }
+
+  void _vibrateError() {
+    Vibration.vibrate(duration: 1000);
+    _soundService.playFailure();
+  }
+
   void _showDuplicateDialog(String zongpaiNo, Map<String, dynamic>? info) {
     showDialog(
       context: context,
@@ -266,8 +303,11 @@ class _RegistrationPageState extends State<RegistrationPage> {
   Widget build(BuildContext context) {
     final colorScheme = Theme.of(context).colorScheme;
 
-    return Scaffold(
-      appBar: AppBar(
+    return KeyboardListener(
+      focusNode: _focusNode,
+      onKeyEvent: _onKeyEvent,
+      child: Scaffold(
+        appBar: AppBar(
         title: const Text('上架登记'),
         actions: [
           Padding(
@@ -551,7 +591,7 @@ class _RegistrationPageState extends State<RegistrationPage> {
                           : Text(
                               _isLocked && _zongpaiNos.length > 1
                                   ? '批量上架（${_zongpaiNos.length} 条）'
-                                  : '确 认 上 架',
+                                  : '确认上架(P1)',
                               style: const TextStyle(fontSize: 18),
                             ),
                     ),
@@ -593,6 +633,7 @@ class _RegistrationPageState extends State<RegistrationPage> {
           ),
         ],
       ),
+    ),
     );
   }
 }