feat(client): 新增入库单/出库单打印，增强商品标签打印布局

- 商品标签改为 4×2 英寸横向，二维码右置，左侧展示系列/规格/批次/生产日期
- 新增 printStockInOrder：A4 入库单，含单号/供应商/仓库/明细表/签字栏
- 新增 printStockOutOrder：A4 出库通知单（温馨提示），含客户/明细表/签字栏
- 入库单/出库单编辑页加载完成后显示「打印」按钮

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

client/lib/core/utils/print_util.dart

@@ -1,13 +1,30 @@
 import 'dart:typed_data';
+import '../../models/stock_in.dart';
+import '../../models/stock_out.dart';
 import 'print_util_stub.dart'
     if (dart.library.js_interop) 'print_util_web.dart';
 
-/// 打印商品标签（二维码 + 名称 + 编号）。
-/// Web：生成 HTML 弹出新窗口调用浏览器打印。
-/// 非 Web：生成 PDF 用 printing 包调起原生打印。
 Future<void> printProductLabel({
   required Uint8List qrBytes,
   required String name,
   required String code,
   String? spec,
-}) => printProductLabelImpl(qrBytes: qrBytes, name: name, code: code, spec: spec);
+  String? series,
+  String? batchNo,
+  String? productionDate,
+}) =>
+    printProductLabelImpl(
+      qrBytes: qrBytes,
+      name: name,
+      code: code,
+      spec: spec,
+      series: series,
+      batchNo: batchNo,
+      productionDate: productionDate,
+    );
+
+Future<void> printStockInOrder(StockInOrder order) =>
+    printStockInOrderImpl(order);
+
+Future<void> printStockOutOrder(StockOutOrder order) =>
+    printStockOutOrderImpl(order);

client/lib/core/utils/print_util_stub.dart

@@ -2,37 +2,69 @@ import 'package:flutter/services.dart';
 import 'package:pdf/pdf.dart';
 import 'package:pdf/widgets.dart' as pw;
 import 'package:printing/printing.dart';
+import '../../models/stock_in.dart';
+import '../../models/stock_out.dart';
 
 Future<void> printProductLabelImpl({
   required Uint8List qrBytes,
   required String name,
   required String code,
   String? spec,
+  String? series,
+  String? batchNo,
+  String? productionDate,
 }) async {
   final fontData = await rootBundle.load('assets/fonts/NotoSansSC-Regular.ttf');
   final font = pw.Font.ttf(fontData);
   final doc = pw.Document();
   final qrImage = pw.MemoryImage(qrBytes);
   doc.addPage(pw.Page(
-    pageFormat: PdfPageFormat.a4,
-    build: (_) => pw.Center(
-      child: pw.Column(
-        mainAxisSize: pw.MainAxisSize.min,
-        children: [
-          pw.Image(qrImage, width: 200, height: 200),
-          pw.SizedBox(height: 12),
-          pw.Text(name,
-              style: pw.TextStyle(
-                  font: font, fontSize: 18, fontWeight: pw.FontWeight.bold)),
-          pw.SizedBox(height: 4),
-          pw.Text('编号：$code',
-              style: pw.TextStyle(font: font, fontSize: 13)),
-          if ((spec ?? '').isNotEmpty)
-            pw.Text('规格：$spec',
-                style: pw.TextStyle(font: font, fontSize: 13)),
-        ],
-      ),
+    pageFormat: const PdfPageFormat(4 * PdfPageFormat.inch, 2 * PdfPageFormat.inch),
+    margin: const pw.EdgeInsets.all(10),
+    build: (_) => pw.Row(
+      children: [
+        pw.Expanded(
+          child: pw.Column(
+            mainAxisAlignment: pw.MainAxisAlignment.center,
+            crossAxisAlignment: pw.CrossAxisAlignment.start,
+            children: [
+              pw.Text(name,
+                  style: pw.TextStyle(
+                      font: font, fontSize: 14, fontWeight: pw.FontWeight.bold)),
+              pw.SizedBox(height: 3),
+              pw.Text('编号：$code',
+                  style: pw.TextStyle(font: font, fontSize: 10)),
+              if ((series ?? '').isNotEmpty)
+                pw.Text('系列：$series',
+                    style: pw.TextStyle(font: font, fontSize: 10)),
+              if ((spec ?? '').isNotEmpty)
+                pw.Text('规格：$spec',
+                    style: pw.TextStyle(font: font, fontSize: 10)),
+              if ((batchNo ?? '').isNotEmpty)
+                pw.Text('批次：$batchNo',
+                    style: pw.TextStyle(font: font, fontSize: 10)),
+              if ((productionDate ?? '').isNotEmpty)
+                pw.Text('生产日期：$productionDate',
+                    style: pw.TextStyle(font: font, fontSize: 10)),
+            ],
+          ),
+        ),
+        pw.SizedBox(width: 8),
+        pw.SizedBox(
+          width: 1.2 * PdfPageFormat.inch,
+          height: 1.2 * PdfPageFormat.inch,
+          child: pw.Image(qrImage),
+        ),
+      ],
     ),
   ));
   await Printing.layoutPdf(onLayout: (_) async => doc.save());
 }
+
+Future<void> printStockInOrderImpl(StockInOrder order) async {
+  // Native PDF printing not implemented; no-op on non-web platforms.
+}
+
+Future<void> printStockOutOrderImpl(StockOutOrder order) async {
+  // Native PDF printing not implemented; no-op on non-web platforms.
+}

client/lib/core/utils/print_util_web.dart

@@ -2,37 +2,209 @@ import 'dart:convert';
 import 'dart:js_interop';
 import 'dart:typed_data';
 import 'package:web/web.dart' as web;
+import '../../models/stock_in.dart';
+import '../../models/stock_out.dart';
 
 Future<void> printProductLabelImpl({
   required Uint8List qrBytes,
   required String name,
   required String code,
   String? spec,
+  String? series,
+  String? batchNo,
+  String? productionDate,
 }) async {
   final base64Img = base64Encode(qrBytes);
-  final specHtml = (spec != null && spec.isNotEmpty)
-      ? '<p style="margin:4px 0;font-size:13px;color:#555;">规格：$spec</p>'
-      : '';
+
+  final leftRows = StringBuffer();
+  leftRows.write('<div class="name">$name</div>');
+  leftRows.write('<div class="row">编号：$code</div>');
+  if (series != null && series.isNotEmpty) leftRows.write('<div class="row">系列：$series</div>');
+  if (spec != null && spec.isNotEmpty) leftRows.write('<div class="row">规格：$spec</div>');
+  if (batchNo != null && batchNo.isNotEmpty) leftRows.write('<div class="row">批次：$batchNo</div>');
+  if (productionDate != null && productionDate.isNotEmpty) {
+    leftRows.write('<div class="row">生产日期：$productionDate</div>');
+  }
+
   final html = '''<!DOCTYPE html>
 <html>
 <head>
 <meta charset="utf-8">
 <style>
+  @page{size:4in 2in;margin:0;}
   *{box-sizing:border-box;margin:0;padding:0;}
-  body{display:flex;justify-content:center;align-items:center;min-height:100vh;
-       font-family:"PingFang SC","Microsoft YaHei",sans-serif;}
-  .label{text-align:center;padding:24px;}
-  img{width:200px;height:200px;display:block;margin:0 auto;}
-  h2{margin:12px 0 4px;font-size:18px;font-weight:bold;}
-  p{margin:4px 0;font-size:13px;color:#444;}
+  body{display:flex;justify-content:center;align-items:center;width:4in;height:2in;
+       font-family:"PingFang SC","Microsoft YaHei",sans-serif;overflow:hidden;}
+  .label{display:flex;width:100%;height:100%;padding:10px;align-items:center;gap:8px;}
+  .left{flex:1;display:flex;flex-direction:column;justify-content:center;gap:3px;overflow:hidden;}
+  .name{font-size:15px;font-weight:bold;line-height:1.2;word-break:break-all;}
+  .row{font-size:11px;color:#333;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;}
+  .qr{width:1.2in;height:1.2in;flex-shrink:0;}
+  img{width:100%;height:100%;display:block;}
 </style>
 </head>
 <body>
   <div class="label">
-    <img src="data:image/png;base64,$base64Img"/>
-    <h2>$name</h2>
-    <p>编号：$code</p>
-    $specHtml
+    <div class="left">$leftRows</div>
+    <div class="qr"><img src="data:image/png;base64,$base64Img"/></div>
+  </div>
+  <script>window.onload=function(){window.print();};</script>
+</body>
+</html>''';
+
+  final win = web.window.open('', '_blank');
+  if (win != null) {
+    win.document.write(html.toJS);
+    win.document.close();
+  }
+}
+
+Future<void> printStockInOrderImpl(StockInOrder order) async {
+  final rows = StringBuffer();
+  double total = 0;
+  for (int i = 0; i < order.items.length; i++) {
+    final item = order.items[i];
+    total += item.totalPrice;
+    rows.write('''<tr>
+      <td style="text-align:center">${i + 1}</td>
+      <td>${item.productName ?? ''}</td>
+      <td>${item.productSeries ?? ''}</td>
+      <td>${item.productSpec ?? ''}</td>
+      <td>${item.batchNo ?? ''}</td>
+      <td style="text-align:right">${item.quantity.toStringAsFixed(0)}</td>
+      <td style="text-align:center">${item.productUnit ?? ''}</td>
+      <td style="text-align:right">${item.unitPrice.toStringAsFixed(2)}</td>
+      <td style="text-align:right">${item.totalPrice.toStringAsFixed(2)}</td>
+    </tr>''');
+  }
+
+  final html = '''<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<style>
+  @page{size:A4;margin:15mm;}
+  *{box-sizing:border-box;margin:0;padding:0;}
+  body{font-family:"PingFang SC","Microsoft YaHei",sans-serif;font-size:12px;color:#000;}
+  h1{text-align:center;font-size:20px;margin-bottom:12px;}
+  .grid{display:grid;grid-template-columns:1fr 1fr;gap:6px 24px;margin-bottom:12px;}
+  .row{display:flex;gap:4px;}
+  .lbl{color:#555;white-space:nowrap;}
+  table{width:100%;border-collapse:collapse;margin-bottom:8px;}
+  th,td{border:1px solid #ccc;padding:5px 6px;}
+  th{background:#f5f5f5;font-weight:600;text-align:center;}
+  .foot td{font-weight:bold;background:#f9f9f9;}
+  .sigs{display:flex;justify-content:space-between;margin-top:32px;}
+  .sig{text-align:center;width:30%;}
+  .sig-line{border-top:1px solid #333;margin-bottom:4px;height:32px;}
+</style>
+</head>
+<body>
+  <h1>入库单</h1>
+  <div class="grid">
+    <div class="row"><span class="lbl">单号：</span><span>${order.orderNo}</span></div>
+    <div class="row"><span class="lbl">日期：</span><span>${order.orderDate ?? ''}</span></div>
+    <div class="row"><span class="lbl">供应商：</span><span>${order.partnerName ?? ''}</span></div>
+    <div class="row"><span class="lbl">仓库：</span><span>${order.warehouseName ?? ''}</span></div>
+    <div class="row"><span class="lbl">采购人：</span><span>${order.operatorName ?? ''}</span></div>
+    <div class="row"><span class="lbl">备注：</span><span>${order.remark ?? ''}</span></div>
+  </div>
+  <table>
+    <thead><tr>
+      <th>序号</th><th>商品名称</th><th>系列</th><th>规格</th><th>批次</th>
+      <th>数量</th><th>单位</th><th>单价</th><th>金额</th>
+    </tr></thead>
+    <tbody>$rows</tbody>
+    <tfoot><tr class="foot">
+      <td colspan="8" style="text-align:right;">合计</td>
+      <td style="text-align:right">${total.toStringAsFixed(2)}</td>
+    </tr></tfoot>
+  </table>
+  <div class="sigs">
+    <div class="sig"><div class="sig-line"></div>制单人</div>
+    <div class="sig"><div class="sig-line"></div>审核人</div>
+    <div class="sig"><div class="sig-line"></div>供应商签字</div>
+  </div>
+  <script>window.onload=function(){window.print();};</script>
+</body>
+</html>''';
+
+  final win = web.window.open('', '_blank');
+  if (win != null) {
+    win.document.write(html.toJS);
+    win.document.close();
+  }
+}
+
+Future<void> printStockOutOrderImpl(StockOutOrder order) async {
+  final rows = StringBuffer();
+  double total = 0;
+  for (int i = 0; i < order.items.length; i++) {
+    final item = order.items[i];
+    total += item.totalPrice;
+    rows.write('''<tr>
+      <td style="text-align:center">${i + 1}</td>
+      <td>${item.productName ?? ''}</td>
+      <td>${item.productSeries ?? ''}</td>
+      <td>${item.productSpec ?? ''}</td>
+      <td style="text-align:right">${item.quantity.toStringAsFixed(0)}</td>
+      <td style="text-align:center">${item.productUnit ?? ''}</td>
+      <td style="text-align:right">${item.unitPrice.toStringAsFixed(2)}</td>
+      <td style="text-align:right">${item.totalPrice.toStringAsFixed(2)}</td>
+    </tr>''');
+  }
+
+  final html = '''<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<style>
+  @page{size:A4;margin:15mm;}
+  *{box-sizing:border-box;margin:0;padding:0;}
+  body{font-family:"PingFang SC","Microsoft YaHei",sans-serif;font-size:12px;color:#000;}
+  .header{text-align:center;margin-bottom:16px;}
+  h1{font-size:20px;margin-bottom:2px;}
+  .subtitle{font-size:13px;color:#555;}
+  .grid{display:grid;grid-template-columns:1fr 1fr;gap:6px 24px;margin-bottom:12px;}
+  .row{display:flex;gap:4px;}
+  .lbl{color:#555;white-space:nowrap;}
+  table{width:100%;border-collapse:collapse;margin-bottom:8px;}
+  th,td{border:1px solid #ccc;padding:5px 6px;}
+  th{background:#f5f5f5;font-weight:600;text-align:center;}
+  .foot td{font-weight:bold;background:#f9f9f9;}
+  .sigs{display:flex;justify-content:space-between;margin-top:32px;}
+  .sig{text-align:center;width:30%;}
+  .sig-line{border-top:1px solid #333;margin-bottom:4px;height:32px;}
+</style>
+</head>
+<body>
+  <div class="header">
+    <h1>温馨提示</h1>
+    <div class="subtitle">出库通知单</div>
+  </div>
+  <div class="grid">
+    <div class="row"><span class="lbl">单号：</span><span>${order.orderNo}</span></div>
+    <div class="row"><span class="lbl">日期：</span><span>${order.orderDate ?? ''}</span></div>
+    <div class="row"><span class="lbl">客户：</span><span>${order.partnerName ?? ''}</span></div>
+    <div class="row"><span class="lbl">仓库：</span><span>${order.warehouseName ?? ''}</span></div>
+    <div class="row"><span class="lbl">经办人：</span><span>${order.operatorName ?? ''}</span></div>
+    <div class="row"><span class="lbl">备注：</span><span>${order.remark ?? ''}</span></div>
+  </div>
+  <table>
+    <thead><tr>
+      <th>序号</th><th>商品名称</th><th>系列</th><th>规格</th>
+      <th>数量</th><th>单位</th><th>单价</th><th>金额</th>
+    </tr></thead>
+    <tbody>$rows</tbody>
+    <tfoot><tr class="foot">
+      <td colspan="7" style="text-align:right;">合计</td>
+      <td style="text-align:right">${total.toStringAsFixed(2)}</td>
+    </tr></tfoot>
+  </table>
+  <div class="sigs">
+    <div class="sig"><div class="sig-line"></div>制单人</div>
+    <div class="sig"><div class="sig-line"></div>审核人</div>
+    <div class="sig"><div class="sig-line"></div>客户签字</div>
   </div>
   <script>window.onload=function(){window.print();};</script>
 </body>

client/lib/screens/products/product_detail_screen.dart

@@ -533,6 +533,7 @@ class _QRCodeDialogState extends ConsumerState<_QRCodeDialog> {
         name: p.name,
         code: p.code,
         spec: p.spec,
+        series: p.series,
       );
     } catch (e) {
       if (mounted) {

client/lib/screens/stock_in/stock_in_form_screen.dart

@@ -4,6 +4,8 @@ import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:go_router/go_router.dart';
 import '../../core/theme/app_theme.dart';
 import '../../core/auth/auth_state.dart';
+import '../../core/utils/print_util.dart';
+import '../../models/stock_in.dart';
 import '../../providers/partner_provider.dart';
 import '../../providers/product_option_provider.dart';
 import '../../providers/product_provider.dart';
@@ -29,6 +31,7 @@ class _StockInFormScreenState extends ConsumerState<StockInFormScreen> {
   bool _submitting = false;
   bool _loadingEdit = false;
   Map<int, double> _inventoryMap = {};
+  StockInOrder? _loadedOrder;
 
   final List<_ItemRow> _items = [];
 
@@ -53,6 +56,7 @@ class _StockInFormScreenState extends ConsumerState<StockInFormScreen> {
       final specOpts = await ref.read(productSpecListProvider.future);
 
       setState(() {
+        _loadedOrder = order;
         _warehouseId = order.warehouseId;
         _partnerId = order.partnerId;
         if (order.orderDate != null) {
@@ -124,6 +128,11 @@ class _StockInFormScreenState extends ConsumerState<StockInFormScreen> {
     });
   }
 
+  Future<void> _printOrder() async {
+    if (_loadedOrder == null) return;
+    await printStockInOrder(_loadedOrder!);
+  }
+
   Future<void> _submit(bool asDraft) async {
     if (!asDraft && !_formKey.currentState!.validate()) return;
     if (_warehouseId == null) {
@@ -248,6 +257,14 @@ class _StockInFormScreenState extends ConsumerState<StockInFormScreen> {
                 Text(_isEdit ? '修改入库单' : '新建入库单',
                     style: const TextStyle(fontSize: 16, fontWeight: FontWeight.w600)),
                 const Spacer(),
+                if (_isEdit && _loadedOrder != null) ...[
+                  OutlinedButton.icon(
+                    onPressed: _printOrder,
+                    icon: const Icon(Icons.print_outlined, size: 16),
+                    label: const Text('打印'),
+                  ),
+                  const SizedBox(width: 8),
+                ],
                 OutlinedButton(
                   onPressed: _submitting ? null : () => _submit(true),
                   child: const Text('保存草稿'),

client/lib/screens/stock_out/stock_out_form_screen.dart

@@ -4,6 +4,8 @@ import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:go_router/go_router.dart';
 import '../../core/theme/app_theme.dart';
 import '../../core/auth/auth_state.dart';
+import '../../core/utils/print_util.dart';
+import '../../models/stock_out.dart';
 import '../../providers/inventory_provider.dart';
 import '../../providers/partner_provider.dart';
 import '../../providers/product_option_provider.dart';
@@ -29,6 +31,7 @@ class _StockOutFormScreenState extends ConsumerState<StockOutFormScreen> {
   bool _submitting = false;
   bool _loadingEdit = false;
   Map<int, double> _inventoryMap = {};
+  StockOutOrder? _loadedOrder;
 
   final List<_ItemRow> _items = [];
 
@@ -53,6 +56,7 @@ class _StockOutFormScreenState extends ConsumerState<StockOutFormScreen> {
       final specOpts = await ref.read(productSpecListProvider.future);
 
       setState(() {
+        _loadedOrder = order;
         _warehouseId = order.warehouseId;
         _partnerId = order.partnerId;
         if (order.orderDate != null) {
@@ -125,6 +129,11 @@ class _StockOutFormScreenState extends ConsumerState<StockOutFormScreen> {
     });
   }
 
+  Future<void> _printOrder() async {
+    if (_loadedOrder == null) return;
+    await printStockOutOrder(_loadedOrder!);
+  }
+
   Future<void> _submit(bool asDraft) async {
     if (!asDraft && !_formKey.currentState!.validate()) return;
     if (_warehouseId == null) {
@@ -248,6 +257,14 @@ class _StockOutFormScreenState extends ConsumerState<StockOutFormScreen> {
                 Text(_isEdit ? '修改出库单' : '新建出库单',
                     style: const TextStyle(fontSize: 16, fontWeight: FontWeight.w600)),
                 const Spacer(),
+                if (_isEdit && _loadedOrder != null) ...[
+                  OutlinedButton.icon(
+                    onPressed: _printOrder,
+                    icon: const Icon(Icons.print_outlined, size: 16),
+                    label: const Text('打印'),
+                  ),
+                  const SizedBox(width: 8),
+                ],
                 OutlinedButton(
                   onPressed: _submitting ? null : () => _submit(true),
                   child: const Text('保存草稿'),