feat: add azxs and bkxs condition extraction

Added two new extraction rules to clsConditionExtractor:
- azxs (安装形式): Extract installation form code from InstallForm field
- bkxs (表壳形式): Extract shell form code from ShellForm field

Examples:
- azxs: A0 (径向无边), Z0 (中轴向无边)
- bkxs: 532 (53=304外壳+安装式, 2=外卡式)

These new conditions can now be used in material selection expressions.

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

VBA/ClassModules/clsConditionExtractor.cls

@@ -41,6 +41,15 @@ Private Sub InitializeRules()
     ' 从 RangeCode 中直接提取
     m_ExtractionRules("lcfw") = Array("RangeCode", "Direct")
 
+    ' 规则4: 安装形式 (azxs)
+    ' 从 InstallForm 中直接提取（例如：A0=径向无边, Z0=中轴向无边）
+    m_ExtractionRules("azxs") = Array("InstallForm", "Direct")
+
+    ' 规则5: 表壳形式 (bkxs)
+    ' 从 ShellForm 中直接提取（3位代码：前2位表壳类型+后1位罩壳类型）
+    ' 例如：532 = 53(304外壳、安装式) + 2(外卡式)
+    m_ExtractionRules("bkxs") = Array("ShellForm", "Direct")
+
     ' 未来可以在这里添加更多提取规则...
     ' 例如:
     ' m_ExtractionRules("bplx") = Array("DialCode", "Direct")  ' 表盘类型