refactor(dto): move app models into dto layer

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

@@ -20,7 +20,7 @@
  *   - `AuthStorage` import 已删（只 `readInitData` 用过，移到 `chatInit` actor 上层调用）
  */
 
-import type { UiMessage } from "@/models/chat/ui-message";
+import type { UiMessage } from "@/data/dto/chat";
 import { chatRepository } from "@/data/repositories/chat_repository";
 import type { IChatRepository } from "@/data/repositories/interfaces";
 import { ChatStorage } from "@/data/storage/chat/chat_storage";