feat: 4项需求实现

1. 供应商/客户编码自动生成（S001/C001...），新建表单隐藏编码字段，编辑保留
2. 财务管理"全部记录"移为第一个 tab
3. 入库单列表 tab 排除 pending 单据，提交后自动移入审核 tab
4. 出库单列表同上；出库表单按仓库+商品自动填最大可用库存数量

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

client/lib/screens/stock_in/stock_in_list_screen.dart

@@ -51,7 +51,7 @@ class _StockInListScreenState extends ConsumerState<StockInListScreen> {
       ],
       tabViews: [
         _buildListTab(filterStatus: 'pending', showNewButton: true),
-        _buildListTab(filterStatus: null, showNewButton: false),
+        _buildListTab(filterStatus: 'exclude_pending', showNewButton: false),
       ],
     );
   }
@@ -76,16 +76,19 @@ class _StockInListScreenState extends ConsumerState<StockInListScreen> {
         ),
       ),
       data: (result) {
-        final orders = filterStatus != null
-            ? result.data
-                .where((o) => o.status == filterStatus)
-                .toList()
-            : result.data;
+        final List<StockInOrder> orders;
+        if (filterStatus == 'pending') {
+          orders = result.data.where((o) => o.status == 'pending').toList();
+        } else if (filterStatus == 'exclude_pending') {
+          orders = result.data.where((o) => o.status != 'pending').toList();
+        } else {
+          orders = result.data;
+        }
         return _buildOrderTable(
           orders: orders,
-          totalCount: filterStatus != null ? orders.length : result.total,
+          totalCount: orders.length,
           page: result.page,
-          showStatusFilter: filterStatus == null,
+          showStatusFilter: filterStatus == 'exclude_pending',
           showNewButton: showNewButton,
         );
       },
@@ -611,7 +614,6 @@ class _StatusFilterDropdown extends StatelessWidget {
           items: [
             const DropdownMenuItem(value: '', child: Text('全部状态', style: TextStyle(fontSize: 13))),
             const DropdownMenuItem(value: 'draft', child: Text('草稿', style: TextStyle(fontSize: 13))),
-            const DropdownMenuItem(value: 'pending', child: Text('待审核', style: TextStyle(fontSize: 13))),
             const DropdownMenuItem(value: 'approved', child: Text('已审核', style: TextStyle(fontSize: 13))),
             const DropdownMenuItem(value: 'rejected', child: Text('已拒绝', style: TextStyle(fontSize: 13))),
           ],