feat: 商品详情页、XLS导入修复、分页选择器、导出功能

后端：
- 新增 product_images 表，支持每商品最多5张图（服务端压缩至1200px/JPEG85%）
- products 表新增 public_id(UUID)、description 字段
- 新增商品详情接口、二维码接口、公开商品接口（无鉴权）
- 修复 XLS 导入：OLE2 magic bytes 检测 + 临时文件解析，兼容 extrame/xls
- 修复商品/名称/系列/规格三张表导入数据为0（LastCol()=0 bug）
- 所有导入接口返回 total/imported/skipped 统计
- config 新增 StorageConfig，支持 STORAGE_* 环境变量覆盖
- 种子数据修复：products 补 public_id、新增 product_images TRUNCATE、schema.sql 表名修正

前端：
- 商品详情页：图片上传/删除、描述内联编辑、二维码弹窗、公开链接复制
- 公开商品页：无鉴权路由 /product/:public_id，Flutter Web SPA
- 商品详情列表（批次追踪）商品名超链接跳转详情页
- 导航「商品管理」改名「商品详情」
- 所有列表表格新增每页条数选择（10/20/50/100）
- 表格列头内嵌筛选（FilterableColumnHeader）
- 导出 Excel 功能（入库/出库/库存/财务/批次/往来单位）
- 网络恢复自动刷新 + 离线缓存展示

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

client/lib/providers/finance_provider.dart

@@ -16,6 +16,7 @@ final financeListProvider =
 
 class FinanceListNotifier extends AsyncNotifier<PageResult<FinanceRecord>> {
   int _page = 1;
+  int _pageSize = 20;
   String _type = '';
   String _month = '';
 
@@ -30,6 +31,7 @@ class FinanceListNotifier extends AsyncNotifier<PageResult<FinanceRecord>> {
           type: _type.isEmpty ? null : _type,
           month: _month.isEmpty ? null : _month,
           page: _page,
+          pageSize: _pageSize,
         );
   }
 
@@ -50,6 +52,12 @@ class FinanceListNotifier extends AsyncNotifier<PageResult<FinanceRecord>> {
     reload();
   }
 
+  void setPageSize(int pageSize) {
+    _pageSize = pageSize;
+    _page = 1;
+    reload();
+  }
+
   void reload() {
     state = const AsyncValue.loading();
     _fetch().then(

client/lib/providers/inventory_provider.dart

@@ -17,6 +17,7 @@ final inventoryListProvider =
 
 class InventoryListNotifier extends AsyncNotifier<PageResult<Inventory>> {
   int _page = 1;
+  int _pageSize = 20;
   int? _warehouseId;
   String _keyword = '';
   PageResult<Inventory>? _cache;
@@ -40,7 +41,7 @@ class InventoryListNotifier extends AsyncNotifier<PageResult<Inventory>> {
           warehouseId: _warehouseId,
           keyword: _keyword.isEmpty ? null : _keyword,
           page: _page,
-          pageSize: 50,
+          pageSize: _pageSize,
         );
   }
 
@@ -49,6 +50,12 @@ class InventoryListNotifier extends AsyncNotifier<PageResult<Inventory>> {
     reload();
   }
 
+  void setPageSize(int pageSize) {
+    _pageSize = pageSize;
+    _page = 1;
+    reload();
+  }
+
   void setWarehouseId(int? id) {
     _warehouseId = id;
     _page = 1;
@@ -83,6 +90,7 @@ final inventoryLogProvider =
 
 class InventoryLogNotifier extends AsyncNotifier<PageResult<InventoryLog>> {
   int _page = 1;
+  int _pageSize = 20;
   PageResult<InventoryLog>? _cache;
 
   @override
@@ -102,7 +110,7 @@ class InventoryLogNotifier extends AsyncNotifier<PageResult<InventoryLog>> {
   Future<PageResult<InventoryLog>> _fetch() {
     return ref.read(inventoryRepositoryProvider).listLogs(
           page: _page,
-          pageSize: 50,
+          pageSize: _pageSize,
         );
   }
 
@@ -111,6 +119,12 @@ class InventoryLogNotifier extends AsyncNotifier<PageResult<InventoryLog>> {
     reload();
   }
 
+  void setPageSize(int pageSize) {
+    _pageSize = pageSize;
+    _page = 1;
+    reload();
+  }
+
   void reload() {
     state = const AsyncValue.loading();
     _fetch().then((result) {

client/lib/providers/partner_provider.dart

@@ -25,6 +25,7 @@ final customerListProvider =
 class PartnerListNotifier extends AsyncNotifier<PageResult<Partner>> {
   final String? type;
   int _page = 1;
+  int _pageSize = 20;
   String _keyword = '';
   PageResult<Partner>? _cache;
 
@@ -49,6 +50,7 @@ class PartnerListNotifier extends AsyncNotifier<PageResult<Partner>> {
           type: type,
           keyword: _keyword.isEmpty ? null : _keyword,
           page: _page,
+          pageSize: _pageSize,
         );
   }
 
@@ -57,6 +59,12 @@ class PartnerListNotifier extends AsyncNotifier<PageResult<Partner>> {
     reload();
   }
 
+  void setPageSize(int pageSize) {
+    _pageSize = pageSize;
+    _page = 1;
+    reload();
+  }
+
   void setKeyword(String keyword) {
     _keyword = keyword;
     _page = 1;

client/lib/providers/product_option_provider.dart

@@ -0,0 +1,112 @@
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import '../core/api/api_client.dart';
+import '../core/auth/auth_state.dart';
+import '../models/product_option.dart';
+import '../providers/connectivity_provider.dart';
+import '../repositories/product_option_repository.dart';
+
+final productOptionRepositoryProvider = Provider<ProductOptionRepository>((ref) {
+  return ProductOptionRepository(ref.watch(apiClientProvider));
+});
+
+// ── 商品名称 ─────────────────────────────────────────────────
+
+final productNameListProvider =
+    AsyncNotifierProvider<ProductNameListNotifier, List<ProductNameOption>>(
+  ProductNameListNotifier.new,
+);
+
+class ProductNameListNotifier extends AsyncNotifier<List<ProductNameOption>> {
+  @override
+  Future<List<ProductNameOption>> build() async {
+    ref.watch(authStateProvider.select((s) => s.user?.shopId));
+    ref.watch(networkRecoveryCountProvider);
+    return ref.read(productOptionRepositoryProvider).listNames();
+  }
+
+  void reload() {
+    state = const AsyncValue.loading();
+    ref.read(productOptionRepositoryProvider).listNames().then(
+          (data) => state = AsyncValue.data(data),
+          onError: (e, st) => state = AsyncValue.error(e, st),
+        );
+  }
+
+  Future<void> create(Map<String, dynamic> data) async {
+    await ref.read(productOptionRepositoryProvider).createName(data);
+    reload();
+  }
+
+  Future<void> delete(int id) async {
+    await ref.read(productOptionRepositoryProvider).deleteName(id);
+    reload();
+  }
+}
+
+// ── 商品系列 ─────────────────────────────────────────────────
+
+final productSeriesListProvider =
+    AsyncNotifierProvider<ProductSeriesListNotifier, List<ProductSeriesOption>>(
+  ProductSeriesListNotifier.new,
+);
+
+class ProductSeriesListNotifier extends AsyncNotifier<List<ProductSeriesOption>> {
+  @override
+  Future<List<ProductSeriesOption>> build() async {
+    ref.watch(authStateProvider.select((s) => s.user?.shopId));
+    ref.watch(networkRecoveryCountProvider);
+    return ref.read(productOptionRepositoryProvider).listSeries();
+  }
+
+  void reload() {
+    state = const AsyncValue.loading();
+    ref.read(productOptionRepositoryProvider).listSeries().then(
+          (data) => state = AsyncValue.data(data),
+          onError: (e, st) => state = AsyncValue.error(e, st),
+        );
+  }
+
+  Future<void> create(Map<String, dynamic> data) async {
+    await ref.read(productOptionRepositoryProvider).createSeries(data);
+    reload();
+  }
+
+  Future<void> delete(int id) async {
+    await ref.read(productOptionRepositoryProvider).deleteSeries(id);
+    reload();
+  }
+}
+
+// ── 商品规格 ─────────────────────────────────────────────────
+
+final productSpecListProvider =
+    AsyncNotifierProvider<ProductSpecListNotifier, List<ProductSpecOption>>(
+  ProductSpecListNotifier.new,
+);
+
+class ProductSpecListNotifier extends AsyncNotifier<List<ProductSpecOption>> {
+  @override
+  Future<List<ProductSpecOption>> build() async {
+    ref.watch(authStateProvider.select((s) => s.user?.shopId));
+    ref.watch(networkRecoveryCountProvider);
+    return ref.read(productOptionRepositoryProvider).listSpecs();
+  }
+
+  void reload() {
+    state = const AsyncValue.loading();
+    ref.read(productOptionRepositoryProvider).listSpecs().then(
+          (data) => state = AsyncValue.data(data),
+          onError: (e, st) => state = AsyncValue.error(e, st),
+        );
+  }
+
+  Future<void> create(Map<String, dynamic> data) async {
+    await ref.read(productOptionRepositoryProvider).createSpec(data);
+    reload();
+  }
+
+  Future<void> delete(int id) async {
+    await ref.read(productOptionRepositoryProvider).deleteSpec(id);
+    reload();
+  }
+}

client/lib/providers/product_provider.dart

@@ -17,6 +17,7 @@ final productListProvider =
 
 class ProductListNotifier extends AsyncNotifier<PageResult<Product>> {
   int _page = 1;
+  int _pageSize = 20;
   String _keyword = '';
   int? _categoryId;
   PageResult<Product>? _cache;
@@ -39,7 +40,7 @@ class ProductListNotifier extends AsyncNotifier<PageResult<Product>> {
     final repo = ref.read(productRepositoryProvider);
     return repo.list(
       page: _page,
-      pageSize: 20,
+      pageSize: _pageSize,
       keyword: _keyword.isEmpty ? null : _keyword,
       categoryId: _categoryId,
     );
@@ -50,6 +51,12 @@ class ProductListNotifier extends AsyncNotifier<PageResult<Product>> {
     reload();
   }
 
+  void setPageSize(int pageSize) {
+    _pageSize = pageSize;
+    _page = 1;
+    reload();
+  }
+
   void setKeyword(String keyword) {
     _keyword = keyword;
     _page = 1;

client/lib/providers/stock_in_provider.dart

@@ -18,6 +18,7 @@ final stockInListProvider =
 
 class StockInListNotifier extends AsyncNotifier<PageResult<StockInOrder>> {
   int _page = 1;
+  int _pageSize = 20;
   String _status = '';
   String? _startDate;
   String? _endDate;
@@ -43,6 +44,7 @@ class StockInListNotifier extends AsyncNotifier<PageResult<StockInOrder>> {
           startDate: _startDate,
           endDate: _endDate,
           page: _page,
+          pageSize: _pageSize,
         );
   }
 
@@ -51,6 +53,12 @@ class StockInListNotifier extends AsyncNotifier<PageResult<StockInOrder>> {
     reload();
   }
 
+  void setPageSize(int pageSize) {
+    _pageSize = pageSize;
+    _page = 1;
+    reload();
+  }
+
   void setStatus(String status) {
     _status = status;
     _page = 1;

client/lib/providers/stock_out_provider.dart

@@ -18,6 +18,7 @@ final stockOutListProvider =
 
 class StockOutListNotifier extends AsyncNotifier<PageResult<StockOutOrder>> {
   int _page = 1;
+  int _pageSize = 20;
   String _status = '';
   String? _startDate;
   String? _endDate;
@@ -43,6 +44,7 @@ class StockOutListNotifier extends AsyncNotifier<PageResult<StockOutOrder>> {
           startDate: _startDate,
           endDate: _endDate,
           page: _page,
+          pageSize: _pageSize,
         );
   }
 
@@ -51,6 +53,12 @@ class StockOutListNotifier extends AsyncNotifier<PageResult<StockOutOrder>> {
     reload();
   }
 
+  void setPageSize(int pageSize) {
+    _pageSize = pageSize;
+    _page = 1;
+    reload();
+  }
+
   void setStatus(String status) {
     _status = status;
     _page = 1;