fix(backend): 入库审核库存沿用明细真实快照名 + 库存列表过滤软删商品，修复历史导入占位顶替；入库/出库列表支持 keyword 搜索

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01YZ4DskSRKsSiheQonFtQvx

backend/internal/service/stock_test.go

@@ -65,6 +65,47 @@ func TestStockService_ApproveStockIn_Success(t *testing.T) {
 	assert.Equal(t, float64(10), logs[0].QtyAfter)
 }
 
+// 历史导入单：明细自带真实快照名，product_id 指向占位商品（名「历史导入占位」）。
+// 审核生成的库存应使用明细快照真名，而非占位商品名。
+func TestStockService_ApproveStockIn_PrefersItemSnapshot(t *testing.T) {
+	db := testutil.SetupTestDB()
+	shop := testutil.CreateTestShop(db, "STOCK009")
+	warehouse := testutil.CreateTestWarehouse(db, shop.ID, "Warehouse")
+	placeholder := testutil.CreateTestProduct(db, shop.ID, "历史导入占位")
+	user := testutil.CreateTestUser(db, shop.ID, "admin", "pass", "admin")
+
+	order := model.StockInOrder{
+		TenantBase:  model.TenantBase{ShopID: shop.ID},
+		OrderNo:     "IN20240101000009",
+		WarehouseID: warehouse.ID,
+		OperatorID:  user.ID,
+		Status:      "pending",
+		OrderDate:   model.Date{Time: time.Now()},
+		Items: []model.StockInItem{
+			{
+				ShopID:      shop.ID,
+				ProductID:   placeholder.ID,
+				ProductCode: "ZXZ029751",
+				ProductName: "贵州茅台酒2006",
+				Series:      "茅台",
+				Spec:        "500ml",
+				Quantity:    10,
+			},
+		},
+	}
+	require.NoError(t, db.Create(&order).Error)
+
+	svc := NewStockService(db)
+	require.NoError(t, svc.ApproveStockIn(shop.ID, order.ID, user.ID))
+
+	var inv model.Inventory
+	require.NoError(t, db.Where("shop_id = ? AND product_id = ?", shop.ID, placeholder.ID).First(&inv).Error)
+	assert.Equal(t, "贵州茅台酒2006", inv.ProductName)
+	assert.Equal(t, "ZXZ029751", inv.ProductCode)
+	assert.Equal(t, "茅台", inv.Series)
+	assert.Equal(t, "500ml", inv.Spec)
+}
+
 func TestStockService_ApproveStockIn_NotPending(t *testing.T) {
 	db := testutil.SetupTestDB()
 	shop := testutil.CreateTestShop(db, "STOCK002")