feat(chat): handle daily message paywall

src/stores/chat/chat-machine.actors.ts

@@ -5,6 +5,7 @@
 import { fromPromise, fromCallback } from "xstate";
 
 import { createChatWebSocket, ChatWebSocket } from "@/core/net/chat-websocket";
+import type { ChatSendResponse } from "@/data/dto/chat";
 import { Result, Logger } from "@/utils";
 
 import {
@@ -83,10 +84,10 @@ export const loadHistoryActor = fromPromise<{
  * HTTP 发送消息（一次发送 = 一次返回）
  * - 后端响应就是 AI 回复（`ChatSendResponse.reply: string`）
  * - 不再调 `getLocalMessages()`（多此一举）
- * - 返回 `{ reply: UiMessage }` —— `sending.onDone` 把它追加到 `context.messages`
+ * - 返回完整 response + 可追加的 reply，方便处理后端 paywall blocked 响应
  */
 export const sendMessageHttpActor = fromPromise<
-  { reply: UiMessage },
+  { response: ChatSendResponse; reply: UiMessage | null },
   { content: string }
 >(async ({ input }) => {
   const result = await chatRepo.sendMessage(input.content);
@@ -94,7 +95,10 @@ export const sendMessageHttpActor = fromPromise<
     log.error("[chat-machine] sendMessageHttpActor failed", { error: result.error });
     throw result.error;
   }
-  return { reply: sendResponseToUiMessage(result.data) };
+  return {
+    response: result.data,
+    reply: result.data.blocked ? null : sendResponseToUiMessage(result.data),
+  };
 });
 
 /** 翻历史（pagination）—— 不走 local-first，纯 server fetch */
@@ -198,4 +202,4 @@ export const sendMessageWsActor = fromPromise<void, { content: string }>(
 );
 
 // Re-export `UiMessage` type for the chat-machine.ts public API
-type UiMessage = import("@/data/dto/chat").UiMessage;
+type UiMessage = import("@/data/dto/chat").UiMessage;