fix: 修复拼接两列数据键名脱节导致的假成功

- SpliceColData/DoJoint 实现读取的键(col1/cola)与 catalog 必填字段
  (col_name_1/col_name_2/col_num_1/col_num_2)完全脱节，填了参数也按
  undefined 找列，拼接出空值仍报成功
- 改读 catalog 真实键名，按 change_type 支持列名/列号两种模式，兼容旧键

src/main/capabilities/data-table-common.ts

@@ -90,9 +90,21 @@ register(["Bivartable_ColumnOperationDf", "Bivartable_DoCal"], (_ctx, _node, arg
   const result: Table = [[...headers, name]]; for (const row of source.slice(1)) result.push([...row, calculate(row[left], row[right], operator)]); return result;
 });
 
+function columnIndexOf(candidate: unknown): number {
+  const text = String(candidate ?? "").trim();
+  if (/^\d+$/.test(text)) return Number(text) - 1;
+  let result = 0;
+  for (const char of text.toUpperCase()) result = result * 26 + (char.charCodeAt(0) - 64);
+  return result - 1;
+}
+
 register(["Bivartable_SpliceColData", "Bivartable_DoJoint"], (_ctx, _node, args) => {
   const source = table(args.df); if (!source.length) return source; const headers = source[0];
-  const left = index(headers, args.col1 ?? args.cola); const right = index(headers, args.col2 ?? args.colb); const name = String(args.name ?? args.colnew ?? "拼接结果"); const separator = String(args.separator ?? "");
+  // catalog 字段：change_type(name/num) + col_name_1/2 或 col_num_1/2；兼容旧键 col1/col2
+  const byName = String(args.change_type ?? "name") !== "num";
+  const left = byName ? index(headers, args.col_name_1 ?? args.col1 ?? args.cola) : columnIndexOf(args.col_num_1);
+  const right = byName ? index(headers, args.col_name_2 ?? args.col2 ?? args.colb) : columnIndexOf(args.col_num_2);
+  const name = String(args.new_col_name ?? args.name ?? args.colnew ?? "拼接结果"); const separator = String(args.connector ?? args.separator ?? "");
   return [[...headers, name], ...source.slice(1).map((row) => [...row, `${row[left] ?? ""}${separator}${row[right] ?? ""}`])];
 });