feat: add preprocessing with value mapping to BOM Extraction System

Add a preprocessing step to the BOM Extraction System to enhance parameter
extraction with mapping values from "对照表" worksheet. For azxs (安装形式)
and lcfw (量程范围), the system now stores both the raw parsed value AND the
mapped value from the lookup table, enabling flexible dual-value matching.

Changes:
- Create M06A_Mapper.bas: New module for value mapping
  - Load azxs/lcfw mappings from "对照表" worksheet
  - Return dual-value format "raw,mapped" (e.g., "A0,径向")
  - Support graceful degradation if "对照表" not found
  - Define constants locally to avoid VBA cross-module reference issues

- Modify M06_ModelParser.bas:
  - Extract raw parameter values first
  - Apply mapping via M06A_Mapper if initialized
  - Store dual values for azxs and lcfw parameters

- Modify M07_BOMMatcher.bas:
  - Update EvaluateCellCondition() to support dual-value matching
  - Split by comma and check if ANY value matches
  - Backward compatible with single-value parameters

- Modify M09_BOMExtractor.bas:
  - Initialize M06A_Mapper during RunBOMExtraction()
  - Add WorksheetExists() helper function
  - Log warning if "对照表" worksheet not found
  - Define MAPPING_SHEET_NAME constant locally

- Modify M04_Config.bas:
  - Add mapping table configuration constants
  - MAPPING_SHEET_NAME, MAPPING_COL_LCFW_KEY, etc.

- Update CLAUDE.md:
  - Document new M06A_Mapper module
  - Update data flow diagram with mapping step
  - Document dual-value matching behavior
  - Update system architecture diagram

- Update docs/RunBOMExtraction_运行机制详解.md:
  - Add M06A_Mapper to all diagrams and documentation
  - Add detailed value mapping section
  - Update sequence diagrams with mapping flow
  - Update parameter examples with dual-value format
  - Bump documentation version to 3.0

Example:
  Input:  Product model "YTHN-100.A0.531.G123.M04.Y3"
  Parse:  azxs="A0", lcfw="M04"
  Map:    azxs="A0,径向", lcfw="M04,高压"
  Match:  BOM库 with azxs="径向" OR "A0" → MATCH

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

VBA_BOMConverter/Modules/M04_Config.bas

@@ -74,6 +74,16 @@ Public Function GetBOMConditionFields() As Variant
     )
 End Function
 
+' ------------------------------------------------------------------------------
+' 映射表配置常量
+' ------------------------------------------------------------------------------
+Public Const MAPPING_SHEET_NAME As String = "对照表"
+Public Const MAPPING_COL_LCFW_KEY As Long = 1      ' A列 - lcfw原始值
+Public Const MAPPING_COL_LCFW_VAL As Long = 2      ' B列 - lcfw映射值
+Public Const MAPPING_COL_AZXS_KEY As Long = 4      ' D列 - azxs原始值
+Public Const MAPPING_COL_AZXS_VAL As Long = 5      ' E列 - azxs映射值
+Public Const MAPPING_START_ROW As Long = 3         ' 数据起始行
+
 ' 检查列名是否为条件列
 Public Function IsConditionField(ByVal colName As String) As Boolean
     Dim fields As Variant