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/repositories/product_option_repository.dart

@@ -127,4 +127,56 @@ class ProductOptionRepository {
           statusCode: e.response?.statusCode);
     }
   }
+
+  // ── 产地 ────────────────────────────────────────────────────
+
+  Future<List<ProductOriginOption>> listOrigins() async {
+    try {
+      final resp = await _client.get('/product-options/origins');
+      final data = (resp.data as Map<String, dynamic>)['data'] as List? ?? [];
+      return data.map((e) => ProductOriginOption.fromJson(e as Map<String, dynamic>)).toList();
+    } on DioException catch (e) {
+      throw AppException(e.response?.data?['error'] as String? ?? '获取产地列表失败',
+          statusCode: e.response?.statusCode);
+    }
+  }
+
+  // ── 保质期 ──────────────────────────────────────────────────
+
+  Future<List<ProductShelfLifeOption>> listShelfLives() async {
+    try {
+      final resp = await _client.get('/product-options/shelf-lives');
+      final data = (resp.data as Map<String, dynamic>)['data'] as List? ?? [];
+      return data.map((e) => ProductShelfLifeOption.fromJson(e as Map<String, dynamic>)).toList();
+    } on DioException catch (e) {
+      throw AppException(e.response?.data?['error'] as String? ?? '获取保质期列表失败',
+          statusCode: e.response?.statusCode);
+    }
+  }
+
+  // ── 储存方式 ─────────────────────────────────────────────────
+
+  Future<List<ProductStorageOption>> listStorages() async {
+    try {
+      final resp = await _client.get('/product-options/storages');
+      final data = (resp.data as Map<String, dynamic>)['data'] as List? ?? [];
+      return data.map((e) => ProductStorageOption.fromJson(e as Map<String, dynamic>)).toList();
+    } on DioException catch (e) {
+      throw AppException(e.response?.data?['error'] as String? ?? '获取储存方式列表失败',
+          statusCode: e.response?.statusCode);
+    }
+  }
+
+  // ── 描述文档 ─────────────────────────────────────────────────
+
+  Future<List<ProductDescriptionDoc>> listDescriptionDocs() async {
+    try {
+      final resp = await _client.get('/product-options/description-docs');
+      final data = (resp.data as Map<String, dynamic>)['data'] as List? ?? [];
+      return data.map((e) => ProductDescriptionDoc.fromJson(e as Map<String, dynamic>)).toList();
+    } on DioException catch (e) {
+      throw AppException(e.response?.data?['error'] as String? ?? '获取描述文档列表失败',
+          statusCode: e.response?.statusCode);
+    }
+  }
 }

client/lib/repositories/product_repository.dart

@@ -135,13 +135,22 @@ class ProductRepository {
     required String name,
     String series = '',
     String spec = '',
+    int? originId,
+    int? shelfLifeId,
+    int? storageId,
+    int? descriptionDocId,
   }) async {
     try {
-      final resp = await _client.post('/products/find-or-create', data: {
+      final body = <String, dynamic>{
         'name': name,
         'series': series,
         'spec': spec,
-      });
+      };
+      if (originId != null) body['origin_id'] = originId;
+      if (shelfLifeId != null) body['shelf_life_id'] = shelfLifeId;
+      if (storageId != null) body['storage_id'] = storageId;
+      if (descriptionDocId != null) body['description_doc_id'] = descriptionDocId;
+      final resp = await _client.post('/products/find-or-create', data: body);
       return Product.fromJson(
           (resp.data as Map<String, dynamic>)['data'] as Map<String, dynamic>);
     } on DioException catch (e) {