Enhance UX by replacing manual input with dropdown for parameter names

- Replace txtParamName textbox with cboParamName dropdown combobox
- Load parameter names from column C in [参数配置] worksheet
- Implement automatic population of parameter dropdown during initialization
- Set first parameter as default selection when data is available
- Add proper validation and error handling for parameter data loading
- Improve data integrity by preventing manual input errors

This enhancement significantly improves user experience by eliminating manual typing and potential typos. Users can now select parameter names from a standardized list maintained in the configuration worksheet, ensuring consistency and reducing errors in the spec addition process.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

VBA/Forms/frmAddSpec.frm

@@ -47,6 +47,30 @@ Private Sub UserForm_Initialize()
         .ListStyle = fmListStyleOption
     End With
 
+    ' 初始化参数名称下拉框 (新增)
+    With Me.cboParamName
+        .Clear
+        If Not mParamWorksheet Is Nothing Then
+            Dim paramLastRow As Long
+            Dim j As Long
+            Dim paramStr As String
+
+            ' 表头在第2行，数据在C列，实际数据从第3行开始
+            paramLastRow = mParamWorksheet.Cells(mParamWorksheet.Rows.count, "C").End(xlUp).row
+            If paramLastRow >= 3 Then
+                For j = 3 To paramLastRow
+                    paramStr = Trim(mParamWorksheet.Cells(j, 3).value)
+                    If paramStr <> "" Then
+                        .AddItem paramStr
+                    End If
+                Next j
+
+                ' 将数据中的第一个数据作为默认数据
+                If .ListCount > 0 Then .ListIndex = 0
+            End If
+        End If
+    End With
+
     ' 初始化预览文本框
     On Error Resume Next
     Me.txtConditionPreview.Text = ""
@@ -228,7 +252,7 @@ End Sub
 Private Sub btnExecute_Click()
     ' --- 校验输入 ---
     Dim paramName As String, newValue As String, strategy As String
-    paramName = Trim(Me.txtParamName.Text)
+    paramName = Trim(Me.cboParamName.Text)
     newValue = Trim(Me.txtNewValue.Text)
     strategy = Me.cboStrategy.value