feat(client): 入库确认进价入口与「待定价」标注

入库单详情弹窗为已审核+含 0 价明细+管理员时显示「确认进价」，
逐行补填真实进价调后端；库存列表与入库明细 0 价/NULL 显示
「待定价」而非 ¥0.00。

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

client/lib/screens/inventory/inventory_list_screen.dart

@@ -312,7 +312,10 @@ class _InventoryListScreenState extends ConsumerState<InventoryListScreen> {
           style: const TextStyle(fontFamily: 'monospace', fontSize: 12))),
       'warehouse' => DataCell(Text(item.warehouseName.isEmpty ? '-' : item.warehouseName)),
       'price' => DataCell(Text(
-          item.unitPrice != null ? '¥${item.unitPrice!.toStringAsFixed(2)}' : '-')),
+          item.unitPrice != null ? '¥${item.unitPrice!.toStringAsFixed(2)}' : '待定价',
+          style: item.unitPrice == null
+              ? const TextStyle(color: AppTheme.warning)
+              : null)),
       'prodDate' => DataCell(Text(item.productionDate ?? '-')),
       'inTime' => DataCell(Text(
           item.createdAt != null && item.createdAt!.length >= 10
@@ -358,8 +361,8 @@ class _InventoryListScreenState extends ConsumerState<InventoryListScreen> {
         if (item.series.isNotEmpty) MobileCardField('系列', item.series),
         if (item.batchNo.isNotEmpty) MobileCardField('批次', item.batchNo),
         MobileCardField('仓库', item.warehouseName.isEmpty ? '-' : item.warehouseName),
-        if (item.unitPrice != null)
-          MobileCardField('单价', '¥${item.unitPrice!.toStringAsFixed(2)}'),
+        MobileCardField('单价',
+            item.unitPrice != null ? '¥${item.unitPrice!.toStringAsFixed(2)}' : '待定价'),
         if (item.supplierName.isNotEmpty)
           MobileCardField('供应商', item.supplierName),
       ],