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>

backend/internal/service/stock_test.go

@@ -27,7 +27,7 @@ func TestStockService_ApproveStockIn_Success(t *testing.T) {
 		WarehouseID: warehouse.ID,
 		OperatorID:  user.ID,
 		Status:      "pending",
-		OrderDate:   time.Now(),
+		OrderDate:   model.Date{Time: time.Now()},
 		Items: []model.StockInItem{
 			{
 				ShopID:   shop.ID,
@@ -78,7 +78,7 @@ func TestStockService_ApproveStockIn_NotPending(t *testing.T) {
 		WarehouseID: warehouse.ID,
 		OperatorID:  user.ID,
 		Status:      "draft", // 非 pending 状态
-		OrderDate:   time.Now(),
+		OrderDate:   model.Date{Time: time.Now()},
 	}
 	require.NoError(t, db.Create(&order).Error)
 
@@ -111,7 +111,7 @@ func TestStockService_ApproveStockOut_Success(t *testing.T) {
 		WarehouseID: warehouse.ID,
 		OperatorID:  user.ID,
 		Status:      "pending",
-		OrderDate:   time.Now(),
+		OrderDate:   model.Date{Time: time.Now()},
 		Items: []model.StockOutItem{
 			{
 				ShopID:   shop.ID,
@@ -162,7 +162,7 @@ func TestStockService_ApproveStockOut_InsufficientStock(t *testing.T) {
 		WarehouseID: warehouse.ID,
 		OperatorID:  user.ID,
 		Status:      "pending",
-		OrderDate:   time.Now(),
+		OrderDate:   model.Date{Time: time.Now()},
 		Items: []model.StockOutItem{
 			{
 				ShopID:   shop.ID,
@@ -193,7 +193,7 @@ func TestStockService_ApproveStockOut_ProductNotInInventory(t *testing.T) {
 		WarehouseID: warehouse.ID,
 		OperatorID:  user.ID,
 		Status:      "pending",
-		OrderDate:   time.Now(),
+		OrderDate:   model.Date{Time: time.Now()},
 		Items: []model.StockOutItem{
 			{
 				ShopID:   shop.ID,
@@ -265,7 +265,7 @@ func TestStockService_MultipleStockIn_AccumulatesInventory(t *testing.T) {
 		WarehouseID: warehouse.ID,
 		OperatorID:  user.ID,
 		Status:      "pending",
-		OrderDate:   time.Now(),
+		OrderDate:   model.Date{Time: time.Now()},
 		Items: []model.StockInItem{
 			{ShopID: shop.ID, ProductID: product.ID, Quantity: 10},
 		},
@@ -280,7 +280,7 @@ func TestStockService_MultipleStockIn_AccumulatesInventory(t *testing.T) {
 		WarehouseID: warehouse.ID,
 		OperatorID:  user.ID,
 		Status:      "pending",
-		OrderDate:   time.Now(),
+		OrderDate:   model.Date{Time: time.Now()},
 		Items: []model.StockInItem{
 			{ShopID: shop.ID, ProductID: product.ID, Quantity: 5},
 		},