feat(client): 库存查询新增规格/系列/入库时间；筛选组件支持搜索+滚动+标签

- 库存查询加规格、系列服务端筛选（后端 IN 条件，前端从 product-options API 加载全量选项）
- 库存查询新增「入库时间」列，导出 Excel 同步带上
- 入库单商品明细：隐藏商品编码列，生产日期从选填折叠区移至主行常显
- 筛选弹窗重构：顶部搜索框实时过滤 + 滚动列表（ConstrainedBox maxHeight）根治溢出
- 已选项以 Chip 标签置顶展示，每个标签带 × 可单独取消
- FilterableColumnHeader 筛选图标改为常驻，不再需要 hover 才显示

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

client/lib/providers/inventory_provider.dart

@@ -20,6 +20,8 @@ class InventoryListNotifier extends AsyncNotifier<PageResult<Inventory>> {
   int _pageSize = 20;
   int? _warehouseId;
   String _keyword = '';
+  List<String> _series = [];
+  List<String> _spec = [];
   PageResult<Inventory>? _cache;
 
   @override
@@ -40,6 +42,8 @@ class InventoryListNotifier extends AsyncNotifier<PageResult<Inventory>> {
     return ref.read(inventoryRepositoryProvider).listInventory(
           warehouseId: _warehouseId,
           keyword: _keyword.isEmpty ? null : _keyword,
+          series: _series.isEmpty ? null : _series,
+          spec: _spec.isEmpty ? null : _spec,
           page: _page,
           pageSize: _pageSize,
         );
@@ -68,6 +72,18 @@ class InventoryListNotifier extends AsyncNotifier<PageResult<Inventory>> {
     reload();
   }
 
+  void setSeries(List<String> series) {
+    _series = series;
+    _page = 1;
+    reload();
+  }
+
+  void setSpec(List<String> spec) {
+    _spec = spec;
+    _page = 1;
+    reload();
+  }
+
   void reload() {
     state = const AsyncValue.loading();
     _fetch().then((result) {