refactor: integrate [领料配置] into [平台配置清单] and add category selection conditions

Major changes:
- Remove dependency on separate [领料配置] sheet
- Load all data from [平台配置清单] in a single pass
- Add "类别选用条件" (CategorySelectCondition) field to support dynamic category filtering
- Add "66代码" (Code66) field for 66-system integration
- Refactor completeness check logic to only verify required categories

Data model changes:
- clsMaterialItem: Add CategorySelectCondition and Code66 properties
- clsCategory: Add CategorySelectCondition property and IsRequiredForModel() method
- clsBOMManager: Refactor LoadData() to use single data source
- clsBOMManager: Add GetRequiredCategories() method
- clsBOMManager: Update GetValidMaterialsByModel() to use category selection conditions

New workflow:
- LoadData() now takes only wsPlatform parameter (removed wsConfig)
- Categories are filtered by "类别选用条件" before completeness check
- Categories with empty selection condition are always required
- Categories with non-empty condition are checked against model specifications

Documentation:
- Update CLAUDE.md with new sheet structure
- Add comprehensive refactoring plan document
- Add v2.0 LoadData flow analysis with Mermaid diagrams
- Add platform configuration sheet reference

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

VBA/ClassModules/clsMaterialItem.cls

@@ -4,9 +4,11 @@
 ' ========================================
 Option Explicit
 
-Public code As String           ' 代号
-Public Name As String           ' 名称
-Public Quantity As Double       ' 数量
-Public Condition As String      ' 选择条件
-Public Category As String       ' 类别
-Public ParentCategory As String ' 上层类别
+Public code As String                    ' 代号
+Public Name As String                    ' 名称
+Public Quantity As Double                ' 数量
+Public Condition As String               ' 选择条件
+Public Category As String                 ' 类别
+Public ParentCategory As String           ' 上层类别
+Public CategorySelectCondition As String  ' 类别选用条件（用于判断该类别是否需要）
+Public Code66 As String                   ' 66系统代码