refactor(chat): rely on server message limits

src/data/schemas/chat/guest_chat_quota.ts

@@ -1,13 +0,0 @@
-/**
- * 游客每日聊天配额数据
- * 原始 Dart: GuestChatQuota (lib/data/models/chat/guest_chat_quota.dart)
- */
-import { z } from "zod";
-
-export const GuestChatQuotaSchema = z.object({
-  remaining: z.number(),
-  date: z.string(),
-});
-
-export type GuestChatQuotaInput = z.input<typeof GuestChatQuotaSchema>;
-export type GuestChatQuotaData = z.output<typeof GuestChatQuotaSchema>;

src/data/schemas/chat/index.ts

@@ -7,7 +7,6 @@ export * from "./chat_message";
 export * from "./chat_send_response";
 export * from "./chat_sync_data";
 export * from "./chat_sync_request";
-export * from "./guest_chat_quota";
 export * from "./image_upload_response";
 export * from "./send_message_request";
 export * from "./stt_data";