feat(client): 出库明细成本/售价/利润三列重设计 + 建单利润列 + 入库列头统一

- 出库详情抽屉（管理员）：数量/成本价/售价/利润 + 合计金额/合计利润 双行；
  operator 见 售价/小计（服务端抹零+前端隐藏双保险）；利润负数 danger
- 出库建单：商品名称下带编码（字体同系列列）；金额列→利润列（实时）；
  底栏合计利润（仅管理员）；进价列仅管理员；提交发新 key（cost_price/sale_price）
- 入库建单列头：进价（单瓶）/ 参考售价 / 总进价
- 退单弹窗金额改售价口径（与冲应收一致）；打印保留待定价回退成本兼容
- models 字段随后端消歧改名；golden 重打；新增抽屉双形态 widget 测试

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01JJ1g8XV1YhhmHRzhwWEW7o

client/lib/screens/stock_in/stock_in_form_screen.dart

@@ -153,7 +153,7 @@ class _StockInFormScreenState extends ConsumerState<StockInFormScreen> {
           final row = _ItemRow();
           row.productId = item.productId;
           row.qtyCtrl.text = item.quantity.toStringAsFixed(0);
-          row.priceCtrl.text = item.unitPrice.toStringAsFixed(2);
+          row.priceCtrl.text = item.costPrice.toStringAsFixed(2);
           row.selectedNameId =
               nameOpts.where((o) => o.name == item.productName).firstOrNull?.id;
           row.selectedSeriesId = seriesOpts
@@ -375,9 +375,8 @@ class _StockInFormScreenState extends ConsumerState<StockInFormScreen> {
         'series': optName(seriesOpts, it.selectedSeriesId),
         'spec': optName(specOpts, it.selectedSpecId),
         'quantity': qty,
-        'unit_price': price,
+        'cost_price': price,
         if (sale > 0) 'sale_price': sale,
-        'total_price': qty * price,
         if (batchNo.isNotEmpty) 'batch_no': batchNo,
         if (productionDate.isNotEmpty) 'production_date': productionDate,
       };
@@ -649,9 +648,9 @@ class _StockInFormScreenState extends ConsumerState<StockInFormScreen> {
     GridCol('prodDate', '生产日期', width: 150, req: true),
     GridCol('batch', '批次号', width: 116, req: true),
     GridCol('qty', '数量', width: 82, num: true, req: true),
-    GridCol('price', '进价', width: 100, num: true),
-    GridCol('sale', '售价', width: 108, num: true, req: true),
-    GridCol('amount', '金额', width: 110, num: true),
+    GridCol('price', '进价（单瓶）', width: 108, num: true),
+    GridCol('sale', '参考售价', width: 108, num: true, req: true),
+    GridCol('amount', '总进价', width: 110, num: true),
     GridCol('act', '', width: 78),
   ];
 
@@ -912,14 +911,14 @@ class _StockInFormScreenState extends ConsumerState<StockInFormScreen> {
                 num: true,
                 hint: '0',
                 onChanged: (_) => setState(() {}))),
-        MobileCardField('进价（可留空/0）', null,
+        MobileCardField('进价·单瓶（可留空/0）', null,
             valueWidget: GciField(
                 controller: item.priceCtrl,
                 num: true,
                 money: true,
                 hint: '留空=待定价',
                 onChanged: (_) => setState(() {}))),
-        MobileCardField('售价', null,
+        MobileCardField('参考售价', null,
             valueWidget: GciField(
                 controller: item.saleCtrl,
                 num: true,
@@ -927,7 +926,7 @@ class _StockInFormScreenState extends ConsumerState<StockInFormScreen> {
                 hint: '0.00',
                 onChanged: (_) => setState(() {}))),
         MobileCardField(
-            '金额', item.pending ? '待定价' : '¥${item.amount.toStringAsFixed(2)}'),
+            '总进价', item.pending ? '待定价' : '¥${item.amount.toStringAsFixed(2)}'),
         MobileCardField('', null,
             valueWidget: TextButton.icon(
               onPressed: () => setState(() => item.expanded = !item.expanded),

client/lib/screens/stock_in/stock_in_list_screen.dart

@@ -688,7 +688,7 @@ class _StockInListScreenState extends ConsumerState<StockInListScreen> {
                 o.partnerName ?? '',
                 o.status,
                 o.orderDate,
-                o.totalAmount,
+                o.costTotal,
               ])
           .toList(),
     );
@@ -712,8 +712,8 @@ class _StockInListScreenState extends ConsumerState<StockInListScreen> {
         return Text(o.warehouseName ?? '-');
       case 'amount':
         return Text(
-            o.totalAmount != null
-                ? '¥${NumberFormat('#,##0').format(o.totalAmount)}'
+            o.costTotal != null
+                ? '¥${NumberFormat('#,##0').format(o.costTotal)}'
                 : '—',
             style: const TextStyle(
                 fontFamily: AppFonts.mono,
@@ -828,11 +828,8 @@ class _StockInListScreenState extends ConsumerState<StockInListScreen> {
       fields: [
         MobileCardField('供应商', o.partnerName ?? '-'),
         MobileCardField('仓库', o.warehouseName ?? '-'),
-        MobileCardField(
-            '合计金额',
-            o.totalAmount != null
-                ? '¥${o.totalAmount!.toStringAsFixed(2)}'
-                : '-'),
+        MobileCardField('合计金额',
+            o.costTotal != null ? '¥${o.costTotal!.toStringAsFixed(2)}' : '-'),
         MobileCardField('入库员', o.operatorName ?? '-'),
         MobileCardField('审核员', o.reviewerName ?? '-'),
       ],
@@ -899,13 +896,13 @@ class _StockInListScreenState extends ConsumerState<StockInListScreen> {
                 series: it.productSeries ?? '—',
                 spec: it.productSpec ?? '',
                 qty: _fmtQty(it.quantity),
-                price: it.unitPrice == 0 ? '待定价' : _money.format(it.unitPrice),
+                price: it.costPrice == 0 ? '待定价' : _money.format(it.costPrice),
                 amount:
-                    it.totalPrice == 0 ? '待定价' : _money.format(it.totalPrice),
-                pending: it.unitPrice == 0,
+                    it.costAmount == 0 ? '待定价' : _money.format(it.costAmount),
+                pending: it.costPrice == 0,
               ))
           .toList(),
-      totalText: o.totalAmount != null ? _money.format(o.totalAmount) : '—',
+      totalText: o.costTotal != null ? _money.format(o.costTotal) : '—',
       actionGroups: _detailActionGroups(o),
     );
   }
@@ -971,7 +968,7 @@ class _StockInListScreenState extends ConsumerState<StockInListScreen> {
     }
     if (audit.isNotEmpty) groups.add(DrawerActionGroup('单据审核', audit));
 
-    final pending = o.items.where((it) => it.unitPrice == 0).length;
+    final pending = o.items.where((it) => it.costPrice == 0).length;
     if (o.status == 'approved' && isAdmin && pending > 0) {
       groups.add(DrawerActionGroup('成本 · $pending 项待定价', [
         b('确认进价', () {
@@ -1025,7 +1022,7 @@ class _StockInListScreenState extends ConsumerState<StockInListScreen> {
   /// 确认进价：为 0 价（待定）明细补填真实进价，调后端前向补偿后刷新列表。
   Future<void> _confirmCost(StockInOrder o) async {
     final pending =
-        o.items.where((it) => it.unitPrice == 0 && it.id != null).toList();
+        o.items.where((it) => it.costPrice == 0 && it.id != null).toList();
     if (pending.isEmpty) return;
     final controllers = {
       for (final it in pending) it.id!: TextEditingController()
@@ -1303,8 +1300,8 @@ class _StockInListScreenState extends ConsumerState<StockInListScreen> {
               series: it.productSeries ?? '',
               spec: it.productSpec ?? '',
               quantity: it.quantity,
-              unitPrice: it.unitPrice,
-              totalPrice: it.totalPrice,
+              unitPrice: it.costPrice,
+              totalPrice: it.costAmount,
               alreadyReturned: it.isReturned,
             ))
         .toList();