fix: capture and persist target object names for delete, outbound, and borrow operations in audit logs

inventory-backend/app/services/inbound/buy_service.py

@@ -280,9 +280,11 @@ class BuyInboundService:
         try:
             stock = StockBuy.query.get(stock_id)
             if not stock: raise ValueError("记录不存在")
+            # 提前获取物料名称用于审计日志
+            material_name = stock.material_name
             db.session.delete(stock)
             db.session.commit()
-            return True
+            return material_name
         except Exception as e:
             db.session.rollback()
             raise e