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/handler/inventory.go

@@ -64,11 +64,46 @@ func (h *InventoryHandler) Logs(c *gin.Context) {
 	query.Count(&total)
 
 	var logs []model.InventoryLog
-	query.Offset((page - 1) * pageSize).Limit(pageSize).Order("id DESC").Find(&logs)
+	query.Preload("Product").Preload("Warehouse").Offset((page-1)*pageSize).Limit(pageSize).Order("id DESC").Find(&logs)
 
 	c.JSON(http.StatusOK, gin.H{"data": logs, "total": total, "page": page, "page_size": pageSize})
 }
 
+// Batches GET /api/v1/inventory/batches — 批次追踪：已审核入库单的明细行
+func (h *InventoryHandler) Batches(c *gin.Context) {
+	shopID := middleware.GetShopID(c)
+	page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
+	pageSize, _ := strconv.Atoi(c.DefaultQuery("page_size", "20"))
+
+	// 查询已审核的入库单明细，关联商品和仓库信息
+	query := h.db.Model(&model.StockInItem{}).
+		Joins("JOIN stock_in_orders ON stock_in_orders.id = stock_in_items.order_id").
+		Where("stock_in_orders.shop_id = ? AND stock_in_orders.status = 'approved'", shopID)
+
+	if productID := c.Query("product_id"); productID != "" {
+		query = query.Where("stock_in_items.product_id = ?", productID)
+	}
+	if warehouseID := c.Query("warehouse_id"); warehouseID != "" {
+		query = query.Where("stock_in_orders.warehouse_id = ?", warehouseID)
+	}
+
+	var total int64
+	query.Count(&total)
+
+	var items []model.StockInItem
+	query.
+		Preload("Product").
+		Preload("Order", func(db *gorm.DB) *gorm.DB {
+			return db.Preload("Warehouse").Preload("Partner")
+		}).
+		Select("stock_in_items.*").
+		Order("stock_in_orders.order_date DESC, stock_in_items.id DESC").
+		Offset((page - 1) * pageSize).Limit(pageSize).
+		Find(&items)
+
+	c.JSON(http.StatusOK, gin.H{"data": items, "total": total, "page": page, "page_size": pageSize})
+}
+
 // CreateCheck POST /api/v1/inventory/checks
 func (h *InventoryHandler) CreateCheck(c *gin.Context) {
 	shopID := middleware.GetShopID(c)