style: standardize VBA property and method name casing

Standardize all VBA property and method names to lowercase for consistent code style:
- Err object: Err.Description → err.Description, Err.Number → err.Number
- Collection properties: .Count → .count
- Range properties: .Rows.Count → .Rows.count, .Row → .row
- Dictionary methods: .Keys → .keys, .Exists → .exists
- Worksheet properties: .Sheets.Count → .Sheets.count
- Fix typo: Thisworkbook.Path → ThisWorkbook.Path

VBA is case-insensitive, but consistent lowercase convention improves readability.

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

VBA_BOMConverter/Modules/M07_BOMMatcher.bas

@@ -142,13 +142,13 @@ Public Function MatchBOMRecord(ByVal ws As Worksheet, ByVal params As Object) As
 ErrorHandler:
     If Not g_Logger Is Nothing Then
         g_Logger.Record "", "M07.MatchBOMRecord", "SystemError", _
-            "匹配过程发生错误: " & Err.Description, ws.Name
+            "匹配过程发生错误: " & err.Description, ws.Name
     End If
 
     result("success") = False
     result("rowCount") = 0
     Set result("rowNums") = New Collection
-    result("message") = "系统错误: " & Err.Description
+    result("message") = "系统错误: " & err.Description
     Set MatchBOMRecord = result
 End Function
 
@@ -431,7 +431,7 @@ Public Function ExtractMaterialInfo( _
 ErrorHandler:
     If Not g_Logger Is Nothing Then
         g_Logger.Record "", "M07.ExtractMaterialInfo", "SystemError", _
-            "提取物料信息失败: " & Err.Description, ws.Name
+            "提取物料信息失败: " & err.Description, ws.Name
     End If
     Set ExtractMaterialInfo = CreateObject("Scripting.Dictionary")
 End Function