feat(client): 出入库单打印按新版式重做 + 单价口径修正

- 版式参照单据样板：公司抬头 + 两行三列表头 + 统一明细列
  （商品编号/名称/系列/规格/批次号/生产日期/数量/单价/金额/备注）
- 单据总计独立成行（仅数量+金额，右对齐高亮）
- 出库单保留温馨提示，入库单去掉
- 签字行：制单人=当前登录用户(OrderPrintMeta)，采购员/销售员=经办人；
  公司名取门店(shopInfoProvider)
- 出库单单价=售价(sale_price)，金额=售价×数量；历史单 sale_price=0
  时回退 unit_price/total_price。入库单单价=进价(unit_price)
- 桌面 PDF 与 Web HTML 两端同构

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

client/lib/widgets/order_print_preview_dialog.dart

@@ -1,13 +1,17 @@
 import 'dart:typed_data';
 import 'package:flutter/foundation.dart' show kIsWeb;
 import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:printing/printing.dart';
+import '../core/auth/auth_state.dart';
 import '../core/errors/error_reporter.dart';
 import '../core/theme/app_theme.dart';
 import '../core/responsive/responsive.dart';
 import '../core/utils/print_util.dart';
+import '../models/shop.dart';
 import '../models/stock_in.dart';
 import '../models/stock_out.dart';
+import '../providers/shop_provider.dart';
 
 /// 单据打印预览弹窗：把待打印的 A4 PDF 光栅化成图片（所见即所得）逐页展示，
 /// 页内点「打印」再调系统打印。解决部分 Windows 系统打印对话框无预览的问题。
@@ -221,11 +225,29 @@ class _OrderPrintPreviewDialogState extends State<OrderPrintPreviewDialog> {
   }
 }
 
+/// 组装单据打印抬头信息：公司名称（门店）+ 制单人（当前登录、点击打印的人）。
+Future<OrderPrintMeta> _buildPrintMeta(WidgetRef ref) async {
+  ShopInfo? shop;
+  try {
+    shop = await ref.read(shopInfoProvider.future);
+  } catch (_) {
+    // 门店信息拉取失败（离线等）时抬头留空，不阻塞打印。
+  }
+  return OrderPrintMeta(
+    shopName: shop?.name ?? '',
+    shopAddress: shop?.address ?? '',
+    shopPhone: shop?.phone ?? '',
+    makerName: ref.read(authStateProvider).user?.realName ?? '',
+  );
+}
+
 /// 打印入库单：桌面端先弹应用内预览，Web 端走浏览器自带打印预览。
 Future<void> showStockInOrderPrint(
-    BuildContext context, StockInOrder order) async {
+    BuildContext context, WidgetRef ref, StockInOrder order) async {
+  final meta = await _buildPrintMeta(ref);
+  if (!context.mounted) return;
   if (kIsWeb) {
-    await safePrint(context, () => printStockInOrder(order));
+    await safePrint(context, () => printStockInOrder(order, meta));
     return;
   }
   await showDialog<void>(
@@ -234,16 +256,18 @@ Future<void> showStockInOrderPrint(
     builder: (_) => OrderPrintPreviewDialog(
       title: '入库单打印预览',
       printName: '入库单',
-      pdfBuilder: () => buildStockInOrderPdf(order),
+      pdfBuilder: () => buildStockInOrderPdf(order, meta),
     ),
   );
 }
 
 /// 打印出库单：桌面端先弹应用内预览，Web 端走浏览器自带打印预览。
 Future<void> showStockOutOrderPrint(
-    BuildContext context, StockOutOrder order) async {
+    BuildContext context, WidgetRef ref, StockOutOrder order) async {
+  final meta = await _buildPrintMeta(ref);
+  if (!context.mounted) return;
   if (kIsWeb) {
-    await safePrint(context, () => printStockOutOrder(order));
+    await safePrint(context, () => printStockOutOrder(order, meta));
     return;
   }
   await showDialog<void>(
@@ -252,7 +276,7 @@ Future<void> showStockOutOrderPrint(
     builder: (_) => OrderPrintPreviewDialog(
       title: '出库单打印预览',
       printName: '出库单',
-      pdfBuilder: () => buildStockOutOrderPdf(order),
+      pdfBuilder: () => buildStockOutOrderPdf(order, meta),
     ),
   );
 }