feat: 完成7项功能任务

后端：
- fix(backend): InventoryLog 增加 Product/Warehouse 关联，Logs 接口加 Preload 修复流水记录显示"-"
- feat(backend): 新增 /inventory/batches 批次追踪接口
- feat(backend): 新增财务记录、编号规则接口（finance、number_rule handler）
- fix(backend): service/stock_test.go 修复 model.Date 类型错误

前端：
- feat(client): 入库/出库管理 Tab 调换顺序（审核在前），审核 Tab 加新建按钮，列表 Tab 无按钮
- feat(client): 入库单/出库单增加详情弹窗，显示完整单据信息和商品明细
- feat(client): 完善出库单新建表单（StockOutFormScreen），支持选客户/仓库/商品
- fix(client): StockInItem/StockOutItem.fromJson 修复读取嵌套 product 对象而非平铺字段
- feat(client): 批次追踪页面（BatchTrackingScreen）及侧边栏入口
- feat(client): 财务管理、盘点、编号规则接入真实后端 API
- fix(client): 入库/出库审核通过后 invalidate inventoryListProvider 刷新库存

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

client/lib/repositories/finance_repository.dart

@@ -0,0 +1,36 @@
+import 'package:dio/dio.dart';
+import '../core/api/api_client.dart';
+import '../core/exceptions.dart';
+import '../core/models/page_result.dart';
+import '../models/finance.dart';
+
+class FinanceRepository {
+  final ApiClient _client;
+  const FinanceRepository(this._client);
+
+  Future<PageResult<FinanceRecord>> listRecords({
+    String? type,
+    String? month,
+    int page = 1,
+    int pageSize = 50,
+  }) async {
+    try {
+      final params = <String, dynamic>{
+        'page': page,
+        'page_size': pageSize,
+        if (type != null && type.isNotEmpty) 'type': type,
+        if (month != null && month.isNotEmpty) 'month': month,
+      };
+      final resp = await _client.get('/finance/records', params: params);
+      return PageResult.fromJson(
+        resp.data as Map<String, dynamic>,
+        FinanceRecord.fromJson,
+      );
+    } on DioException catch (e) {
+      throw AppException(
+        e.response?.data?['error'] as String? ?? '获取财务记录失败',
+        statusCode: e.response?.statusCode,
+      );
+    }
+  }
+}

client/lib/repositories/inventory_repository.dart

@@ -35,6 +35,44 @@ class InventoryRepository {
     }
   }
 
+  Future<Map<String, dynamic>> createCheck(Map<String, dynamic> data) async {
+    try {
+      final resp = await _client.post('/inventory/checks', data: data);
+      return resp.data as Map<String, dynamic>;
+    } on DioException catch (e) {
+      throw AppException(
+        e.response?.data?['error'] as String? ?? '提交盘点失败',
+        statusCode: e.response?.statusCode,
+      );
+    }
+  }
+
+  Future<PageResult<BatchRecord>> listBatches({
+    int? productId,
+    int? warehouseId,
+    int page = 1,
+    int pageSize = 20,
+  }) async {
+    try {
+      final params = <String, dynamic>{
+        'page': page,
+        'page_size': pageSize,
+        if (productId != null) 'product_id': productId,
+        if (warehouseId != null) 'warehouse_id': warehouseId,
+      };
+      final resp = await _client.get('/inventory/batches', params: params);
+      return PageResult.fromJson(
+        resp.data as Map<String, dynamic>,
+        BatchRecord.fromJson,
+      );
+    } on DioException catch (e) {
+      throw AppException(
+        e.response?.data?['error'] as String? ?? '获取批次数据失败',
+        statusCode: e.response?.statusCode,
+      );
+    }
+  }
+
   Future<PageResult<InventoryLog>> listLogs({
     int? warehouseId,
     int? productId,

client/lib/repositories/number_rule_repository.dart

@@ -0,0 +1,36 @@
+import 'package:dio/dio.dart';
+import '../core/api/api_client.dart';
+import '../core/exceptions.dart';
+import '../models/number_rule.dart';
+
+class NumberRuleRepository {
+  final ApiClient _client;
+  const NumberRuleRepository(this._client);
+
+  Future<List<NumberRule>> list() async {
+    try {
+      final resp = await _client.get('/number-rules');
+      final data = resp.data['data'] as List;
+      return data
+          .map((e) => NumberRule.fromJson(e as Map<String, dynamic>))
+          .toList();
+    } on DioException catch (e) {
+      throw AppException(
+        e.response?.data?['error'] as String? ?? '获取编号规则失败',
+        statusCode: e.response?.statusCode,
+      );
+    }
+  }
+
+  Future<NumberRule> update(int id, Map<String, dynamic> data) async {
+    try {
+      final resp = await _client.put('/number-rules/$id', data: data);
+      return NumberRule.fromJson(resp.data['data'] as Map<String, dynamic>);
+    } on DioException catch (e) {
+      throw AppException(
+        e.response?.data?['error'] as String? ?? '更新编号规则失败',
+        statusCode: e.response?.statusCode,
+      );
+    }
+  }
+}