docs: settle host import leading-star and lookup label contract

assets/examples/replaces-import.action.example.json

@@ -1,7 +1,7 @@
 {
   "id": "item-import",
   "label": "导入记录",
-  "description": "由宿主「导入数据」面板调用：解析 Excel/CSV 并写入业务表（含领域校验与派生字段）。",
+  "description": "由宿主「导入数据」面板调用：解析 Excel/CSV 并写入业务表（含领域校验与派生字段）。表头可带前/后缀*；lookup 列可为「编号 · 名称」。",
   "replaces": "import",
   "placements": [],
   "executionProfile": "sync",
@@ -19,7 +19,7 @@
       "filePath": {
         "type": "string",
         "title": "导入文件",
-        "description": "由宿主导入面板传入的 Excel/CSV 路径。",
+        "description": "由宿主导入面板传入的 Excel/CSV 路径。表头：显示名（可带前/后缀*）；关联列可填编号或「编号 · 名称」。",
         "format": "file"
       },
       "onError": {