feat(client): 入库表单关联商品属性字典（产地/保质期/储存方式/描述文档）

- product_option.dart: 新增 4 个字典 model（Origin/ShelfLife/Storage/DescriptionDoc）
- product_option_repository.dart: 新增 4 个 list 方法（listOrigins/ShelfLives/Storages/DescriptionDocs）
- product_option_provider.dart: 新增 4 个 FutureProvider 供表单使用
- product_repository.dart: findOrCreate 加 originId/shelfLifeId/storageId/descriptionDocId 可选参数
- stock_in_form_screen.dart: _ItemRow 加 4 个可选 ID 字段；新增 4 个 SearchableOptionField 方法；移动端卡片视图增加 4 个可选字段；提交时传入属性 ID

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

client/lib/screens/stock_in/stock_in_form_screen.dart

@@ -226,7 +226,15 @@ class _StockInFormScreenState extends ConsumerState<StockInFormScreen> {
         try {
           final product = await ref
               .read(productRepositoryProvider)
-              .findOrCreate(name: name, series: series, spec: spec);
+              .findOrCreate(
+                name: name,
+                series: series,
+                spec: spec,
+                originId: item.selectedOriginId,
+                shelfLifeId: item.selectedShelfLifeId,
+                storageId: item.selectedStorageId,
+                descriptionDocId: item.selectedDescriptionDocId,
+              );
           item.productId = product.id;
         } catch (e) {
           if (mounted) {
@@ -761,6 +769,78 @@ class _StockInFormScreenState extends ConsumerState<StockInFormScreen> {
     );
   }
 
+  Widget _originField(_ItemRow item) {
+    final asyncOrigins = ref.watch(productOriginListProvider);
+    return asyncOrigins.when(
+      loading: () => const LinearProgressIndicator(),
+      error: (_, __) => const Text('加载失败'),
+      data: (origins) => SearchableOptionField(
+        options: origins
+            .map((o) => OptionItem(id: o.id, name: o.name, code: o.code))
+            .toList(),
+        selectedId: item.selectedOriginId,
+        hint: '选择产地（可选）',
+        dialogTitle: '选择产地',
+        isRequired: false,
+        onChanged: (v) => setState(() => item.selectedOriginId = v),
+      ),
+    );
+  }
+
+  Widget _shelfLifeField(_ItemRow item) {
+    final asyncShelfLives = ref.watch(productShelfLifeListProvider);
+    return asyncShelfLives.when(
+      loading: () => const LinearProgressIndicator(),
+      error: (_, __) => const Text('加载失败'),
+      data: (shelfLives) => SearchableOptionField(
+        options: shelfLives
+            .map((o) => OptionItem(id: o.id, name: o.name, code: o.code))
+            .toList(),
+        selectedId: item.selectedShelfLifeId,
+        hint: '选择保质期（可选）',
+        dialogTitle: '选择保质期',
+        isRequired: false,
+        onChanged: (v) => setState(() => item.selectedShelfLifeId = v),
+      ),
+    );
+  }
+
+  Widget _storageField(_ItemRow item) {
+    final asyncStorages = ref.watch(productStorageListProvider);
+    return asyncStorages.when(
+      loading: () => const LinearProgressIndicator(),
+      error: (_, __) => const Text('加载失败'),
+      data: (storages) => SearchableOptionField(
+        options: storages
+            .map((o) => OptionItem(id: o.id, name: o.name, code: o.code))
+            .toList(),
+        selectedId: item.selectedStorageId,
+        hint: '选择储存方式（可选）',
+        dialogTitle: '选择储存方式',
+        isRequired: false,
+        onChanged: (v) => setState(() => item.selectedStorageId = v),
+      ),
+    );
+  }
+
+  Widget _descriptionDocField(_ItemRow item) {
+    final asyncDocs = ref.watch(productDescriptionDocListProvider);
+    return asyncDocs.when(
+      loading: () => const LinearProgressIndicator(),
+      error: (_, __) => const Text('加载失败'),
+      data: (docs) => SearchableOptionField(
+        options: docs
+            .map((o) => OptionItem(id: o.id, name: o.title))
+            .toList(),
+        selectedId: item.selectedDescriptionDocId,
+        hint: '选择介绍文档（可选）',
+        dialogTitle: '选择介绍文档',
+        isRequired: false,
+        onChanged: (v) => setState(() => item.selectedDescriptionDocId = v),
+      ),
+    );
+  }
+
   int _specQtyOf(_ItemRow item) =>
       ref.read(productSpecListProvider).valueOrNull
           ?.where((o) => o.id == item.selectedSpecId)
@@ -864,6 +944,10 @@ class _StockInFormScreenState extends ConsumerState<StockInFormScreen> {
         MobileCardField('金额', '¥${amount.toStringAsFixed(2)}'),
         MobileCardField('批次号', null, valueWidget: _batchField(item)),
         MobileCardField('生产日期', null, valueWidget: _dateField(item)),
+        MobileCardField('产地', null, valueWidget: _originField(item)),
+        MobileCardField('保质期', null, valueWidget: _shelfLifeField(item)),
+        MobileCardField('储存方式', null, valueWidget: _storageField(item)),
+        MobileCardField('介绍文档', null, valueWidget: _descriptionDocField(item)),
       ],
     );
   }
@@ -908,6 +992,11 @@ class _ItemRow {
   int? selectedNameId;
   int? selectedSeriesId;
   int? selectedSpecId;
+  // 商品属性字典（可选，入库时关联到商品）
+  int? selectedOriginId;
+  int? selectedShelfLifeId;
+  int? selectedStorageId;
+  int? selectedDescriptionDocId;
   final TextEditingController qtyCtrl = TextEditingController(text: '1');
   final TextEditingController priceCtrl = TextEditingController();
   final TextEditingController batchNoCtrl = TextEditingController();