fix: resolve duplicate variable declaration compilation errors

- Move shouldExclude declaration to function level in MatchAllMaterialTypesWithValidation
- Move rawMat and result declarations to function level in BOMExtraction
- Remove duplicate Dim statements inside loops

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

VBA_BOMConverter/Modules/M09_BOMExtractor.bas

@@ -127,6 +127,8 @@ Public Function BOMExtraction() As String
 
     Dim i As Long
     Dim totalModels As Long
+    Dim rawMat As Variant  ' 在函数级别声明一次
+    Dim result As Variant  ' 在函数级别声明一次
     totalModels = UBound(inputModels, 1)
 
     For i = LBound(inputModels, 1) To UBound(inputModels, 1)
@@ -159,13 +161,11 @@ Public Function BOMExtraction() As String
         Set modelResults = ProcessSingleModel(modelString, g_BOMWorkbook, g_Logger, productionOrderNo, orderQty, rawMaterials)
 
         ' 收集未过滤的物料（用于库存比对）
-        Dim rawMat As Variant
         For Each rawMat In rawMaterials
             allRawMaterials.Add rawMat
         Next rawMat
 
         ' 合并已过滤的结果（用于BOM提取结果和BIP上传）
-        Dim result As Variant
         For Each result In modelResults
             allResults.Add result
         Next result
@@ -196,7 +196,6 @@ Public Function BOMExtraction() As String
     Dim componentMaterials As Collection
     Set componentMaterials = New Collection
 
-    Dim rawMat As Variant
     For Each rawMat In allRawMaterials
         If rawMat("materialType") = "部件" Then
             componentMaterials.Add rawMat
@@ -621,6 +620,9 @@ Private Function MatchAllMaterialTypesWithValidation( _
     ' 初始化未过滤集合（用于库存比对工作表）
     Set outRawMaterials = New Collection
 
+    ' 声明过滤标志变量（在函数级别声明一次）
+    Dim shouldExclude As Boolean
+
     If validationResult("valid") Then
         ' 验证通过，收集所有物料
         Dim resultKey As Variant
@@ -634,7 +636,6 @@ Private Function MatchAllMaterialTypesWithValidation( _
                 outRawMaterials.Add mat
 
                 ' 2. 添加到已过滤集合（排除库存不足的部件标记）
-                Dim shouldExclude As Boolean
                 shouldExclude = False
 
                 If mat.Exists("isStockSufficient") Then
@@ -661,7 +662,6 @@ Private Function MatchAllMaterialTypesWithValidation( _
                 outRawMaterials.Add mat2
 
                 ' 2. 添加到已过滤集合（排除库存不足的部件标记）
-                Dim shouldExclude As Boolean
                 shouldExclude = False
 
                 If mat2.Exists("isStockSufficient") Then