refactor(data): merge DTO models into schemas

src/stores/chat/__tests__/chat-unlock-flow.test.ts

@@ -1,7 +1,7 @@
 import { describe, expect, it } from "vitest";
 import { createActor, fromPromise, waitFor } from "xstate";
 
-import { ChatSendResponse } from "@/data/dto/chat";
+import { ChatSendResponse } from "@/data/schemas/chat";
 import type {
   UnlockMessageOutput,
   UnlockMessageRequest,