Hide H5 auth and document phase one scope

hy_qa_asset_backend/frontend/lib/h5MockQa.ts

@@ -51,7 +51,7 @@ export const initialMessages: ChatMessage[] = [
     role: "assistant",
     content:
       "你好，我是千问千答助手。你可以把最近遇到的亲子、关系、情绪或行动问题发给我，我会优先基于已审核的答疑资产给你一个可落地的回应。",
-    boundary: "当前为 H5 体验版，登录暂用 mock 占位；问答答案只读取后端可调用库。",
+    boundary: "当前为 H5 体验版，一期免登录试用；问答答案只读取后端可调用库。",
     createdAt: "09:30"
   }
 ];