refactor(chat): remove guest history synchronization

src/data/repositories/chat_remote_data_source.ts

@@ -6,8 +6,6 @@ import type {
 import {
   ChatHistoryResponse,
   ChatPreviewsResponse,
-  ChatSyncRequest,
-  ChatSyncRequestSchema,
   ChatSendResponse,
   SendMessageRequestSchema,
   UnlockHistoryRequestSchema,
@@ -58,15 +56,6 @@ export class ChatRemoteDataSource {
     return Result.wrap(() => this.api.getPreviews(options));
   }
 
-  async syncGuestHistory(
-    request: ChatSyncRequest,
-    options?: ChatRequestOptions,
-  ): Promise<Result<void>> {
-    return Result.wrap(() =>
-      this.api.syncGuestHistory(ChatSyncRequestSchema.parse(request), options),
-    );
-  }
-
   async getHistory(
     characterId: string,
     limit = 50,