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.go

@@ -64,16 +64,26 @@ func (s *StockService) ApproveStockIn(shopID, orderID, reviewerID uint64) error
 				unitPricePtr = &itemCopy.UnitPrice
 			}
 
-			productCode := ""
-			productName := ""
-			series := ""
-			spec := ""
+			// 优先使用明细自带快照列（历史导入单的真实商品信息在此），
+			// Product 关联仅作兜底（普通 UI 录入单的明细快照为空）。
+			productCode := itemCopy.ProductCode
+			productName := itemCopy.ProductName
+			series := itemCopy.Series
+			spec := itemCopy.Spec
 			unit := ""
 			if itemCopy.Product != nil {
-				productCode = itemCopy.Product.Code
-				productName = itemCopy.Product.Name
-				series = itemCopy.Product.Series
-				spec = itemCopy.Product.Spec
+				if productCode == "" {
+					productCode = itemCopy.Product.Code
+				}
+				if productName == "" {
+					productName = itemCopy.Product.Name
+				}
+				if series == "" {
+					series = itemCopy.Product.Series
+				}
+				if spec == "" {
+					spec = itemCopy.Product.Spec
+				}
 				unit = itemCopy.Product.Unit
 			}