fix(test): 修复测试数据库 schema 和 Flutter 测试与屏幕重构的兼容性

- backend/testutil/setup.go: SQLite shops 表补充 business_hours 列
- stock_in_screen_test: 入库管理双 Tab 重构后，draft/pending 测试改为先切换到「入库审核」Tab
- stock_out_insufficient_stock_flow_test: Inventory 构造参数 productUnit→unit，补充必填 id
- inventory_repository_test: mock 数据改为平铺字段格式，补充必填 id
- docs: 新增 NAS + Gitea 部署文档（Runner 设置、Shadowrocket 中继说明）

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

client/test/stock_out_insufficient_stock_flow_test.dart

@@ -101,11 +101,12 @@ class _FakeInventoryRepository extends InventoryRepository {
     return const PageResult(
       data: [
         Inventory(
+          id: 1,
           warehouseId: 1,
           warehouseName: '主仓库',
           productId: 1,
           productName: '五粮液',
-          productUnit: '瓶',
+          unit: '瓶',
           quantity: 1,
         ),
       ],