refactor: split order validation and processing into separate functions

- Add OrderValidationModule for checking order material validity
- Modify Sheet9 to separate validation (CommandButton1) from processing (CommandButton5)
- Support filtered data validation with performance optimization

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

VBA/DocumentModules/Sheet9.cls

@@ -4,7 +4,7 @@
 '=====================================================================
 Private Sub CommandButton1_Click()
     Call ProcessProductModels
-    Call ProcessOrdersToBIP
+    Call ValidateOrderMaterials
 End Sub
 
 '=====================================================================
@@ -25,4 +25,8 @@ End Sub
 
 Private Sub CommandButton4_Click()
     ThisWorkbook.Worksheets("产品订单").Range("A2:G10000").ClearContents
+End Sub
+
+Private Sub CommandButton5_Click()
+    Call ProcessOrdersToBIP
 End Sub