refactor(api): use dto barrel imports

src/data/services/api/chat_api.ts

@@ -7,14 +7,16 @@
 import { httpClient } from "./http_client";
 import { ApiPath } from "./api_path";
 import { ApiEnvelope, unwrap } from "./response_helper";
-import { ChatHistoryResponse } from "@/data/dto/chat/chat_history_response";
-import { ChatSendResponse } from "@/data/dto/chat/chat_send_response";
-import { ChatSyncData } from "@/data/dto/chat/chat_sync_data";
-import { ChatSyncRequest } from "@/data/dto/chat/chat_sync_request";
-import { ImageUploadResponse } from "@/data/dto/chat/image_upload_response";
-import { SendMessageRequest } from "@/data/dto/chat/send_message_request";
-import { SttData } from "@/data/dto/chat/stt_data";
-import { SyncMessage } from "@/data/dto/chat/sync_message";
+import {
+  ChatHistoryResponse,
+  ChatSendResponse,
+  ChatSyncData,
+  ChatSyncRequest,
+  ImageUploadResponse,
+  SendMessageRequest,
+  SttData,
+  SyncMessage,
+} from "@/data/dto/chat";
 
 export class ChatApi {
   /**