refactor: add subcategory fallback logic for material filtering

Refactored the material retrieval logic in GetMaterialsByModel to
automatically search within subcategories if no matches are found in the
specified parent category.

- Added FilterCategoryWithSubcategories helper function to handle recursive
  searching and fallback logic.
- Restructured main function to delegate filtering to the new helper.
- Enhanced code comments to clarify the step-by-step matching process.

VBA/ClassModules/clsBOMManager.cls

@@ -406,7 +406,9 @@ Public Function GetMaterialsByModel(modelStr As String, _
     Dim result As collection
     Set result = New collection
 
-    ' 1. 解析型号
+    ' ========================================
+    ' 第1步: 解析型号并提取条件
+    ' ========================================
     Dim parser As New clsModelParser
     If Not parser.ParseModel(modelStr) Then
         Debug.Print "型号解析失败: " & parser.ErrorMessage
@@ -414,7 +416,6 @@ Public Function GetMaterialsByModel(modelStr As String, _
         Exit Function
     End If
 
-    ' 2. 提取条件
     Dim extractor As New clsConditionExtractor
     Dim conditions As Object
     Set conditions = extractor.ExtractConditions(parser)
@@ -428,55 +429,142 @@ Public Function GetMaterialsByModel(modelStr As String, _
     Next key
     Debug.Print ""
 
-    ' 3. 创建条件匹配器
+    ' ========================================
+    ' 第2步: 按类别筛选物料（自动降级到子类别）
+    ' ========================================
     Dim matcher As New clsConditionMatcher
-
-    ' 4. 获取要筛选的物料范围
-    Dim materialsToFilter As collection
-    Set materialsToFilter = New collection
+    Dim totalMatchCount As Long
+    Dim catResult As collection  ' 提前声明，避免在If/Else中重复声明
+    Dim cat As clsCategory
+    Dim rootCat As clsCategory
+    Dim i As Long, j As Long
+    totalMatchCount = 0
 
     If categoryName <> "" Then
-        ' 指定类别：获取该类别的所有物料
-        Dim cat As clsCategory
+        ' ========================================
+        ' 情况A: 指定了类别名称
+        ' 只在该类别及其子类别中查找
+        ' ========================================
         Set cat = GetCategory(categoryName)
+
         If Not cat Is Nothing Then
-            Dim i As Long
-            For i = 1 To cat.materials.Count
-                materialsToFilter.Add cat.materials(i)
+            ' 从该类别开始查找（包含子类别降级逻辑）
+            Set catResult = FilterCategoryWithSubcategories(cat, matcher, conditions)
+
+            ' 合并结果
+            For i = 1 To catResult.Count
+                result.Add catResult(i)
             Next i
+            totalMatchCount = catResult.Count
         End If
     Else
-        ' 未指定类别：获取所有根类别的物料
-        Dim rootCat As clsCategory
-        Dim j As Long
+        ' ========================================
+        ' 情况B: 未指定类别名称
+        ' 遍历所有根类别，对每个类别应用子类别降级逻辑
+        ' ========================================
         For j = 1 To rootCategories.Count
             Set rootCat = rootCategories(j)
-            ' 递归获取所有物料
-            Call CollectAllMaterials(rootCat, materialsToFilter)
+
+            ' 对每个根类别应用筛选（包含子类别降级逻辑）
+            Set catResult = FilterCategoryWithSubcategories(rootCat, matcher, conditions)
+
+            ' 合并结果
+            For i = 1 To catResult.Count
+                result.Add catResult(i)
+            Next i
+            totalMatchCount = totalMatchCount + catResult.Count
         Next j
     End If
 
-    ' 5. 筛选符合条件的物料
+    Debug.Print "共匹配 " & totalMatchCount & " 个物料"
+    Debug.Print String(60, "=")
+
+    Set GetMaterialsByModel = result
+End Function
+
+' ========================================
+' FilterCategoryWithSubcategories 方法 (私有)
+' 功能: 对指定类别进行筛选，如果无匹配则自动降级到子类别
+' 参数:
+'   cat        - 类别对象
+'   matcher    - 条件匹配器对象
+'   conditions - 提取的条件字典
+' 返回: Collection对象，包含匹配的物料
+'
+' 工作逻辑:
+'   1. 先尝试在当前类别下筛选物料
+'   2. 如果当前类别有匹配结果，直接返回
+'   3. 如果当前类别无匹配结果，检查是否有子类别
+'   4. 如果有子类别，递归对所有子类别进行筛选
+'   5. 如果无子类别，返回空集合
+'
+' 示例场景:
+'   型号: "YTHN-100.A0.532.M203.M16.Y3"
+'   类别"部件"下有物料"低压接头部件"（条件: lcfw=M02）
+'   如果该型号的量程不是M02，则"部件"类别无匹配
+'   此时自动降级到子类别"接头"、"弹性元件"等查找
+' ========================================
+Private Function FilterCategoryWithSubcategories(ByVal cat As clsCategory, _
+                                                 ByVal matcher As clsConditionMatcher, _
+                                                 ByVal conditions As Object) As collection
+    Dim result As collection
+    Set result = New collection
+
+    ' 类别不存在，返回空集合
+    If cat Is Nothing Then
+        Set FilterCategoryWithSubcategories = result
+        Exit Function
+    End If
+
+    ' ========================================
+    ' 第一阶段: 尝试在当前类别下筛选
+    ' ========================================
     Dim mat As clsMaterialItem
+    Dim i As Long
     Dim matchCount As Long
     matchCount = 0
 
-    For Each mat In materialsToFilter
-        ' 使用条件匹配器判断
+    ' 遍历当前类别的所有物料进行筛选
+    For i = 1 To cat.materials.Count
+        Set mat = cat.materials(i)
         If matcher.IsMatch(mat.Condition, conditions) Then
             result.Add mat
             matchCount = matchCount + 1
 
             ' 调试输出
-            Debug.Print "【匹配】 " & mat.code & " - " & mat.Name & _
+            Debug.Print "【匹配】" & cat.categoryName & " > " & _
+                       mat.code & " - " & mat.Name & _
                        " | 条件: " & IIf(mat.Condition = "", "(无)", mat.Condition)
         End If
-    Next mat
+    Next i
 
-    Debug.Print "共匹配 " & matchCount & " 个物料"
-    Debug.Print String(60, "=")
+    ' ========================================
+    ' 第二阶段: 如果当前类别无匹配，检查子类别
+    ' ========================================
+    If matchCount = 0 And cat.HasSubCategories Then
+        Debug.Print "【降级】类别 """ & cat.categoryName & """ 无匹配物料，降级到子类别查找..."
 
-    Set GetMaterialsByModel = result
+        ' 递归处理所有子类别
+        Dim subCat As clsCategory
+        Dim j As Long
+        For j = 1 To cat.SubCategories.Count
+            Set subCat = cat.SubCategories(j)
+
+            ' 递归调用，获取子类别的匹配结果
+            Dim subResult As collection
+            Set subResult = FilterCategoryWithSubcategories(subCat, matcher, conditions)
+
+            ' 合并子类别的结果
+            Dim k As Long
+            For k = 1 To subResult.Count
+                result.Add subResult(k)
+            Next k
+        Next j
+    ElseIf matchCount > 0 Then
+        Debug.Print "【成功】类别 """ & cat.categoryName & """ 匹配 " & matchCount & " 个物料"
+    End If
+
+    Set FilterCategoryWithSubcategories = result
 End Function
 
 ' ========================================