refactor(env): centralize app environment detection

src/data/dto/chat/guest_chat_quota.ts

@@ -6,7 +6,7 @@ import {
   type GuestChatQuotaInput,
   type GuestChatQuotaData,
 } from "@/data/schemas/chat/guest_chat_quota";
-import { isProduction } from "@/utils/app-env";
+import { AppEnvUtil } from "@/utils/app-env";
 
 export class GuestChatQuota {
   // 静态常量
@@ -45,7 +45,7 @@ export class GuestChatQuota {
    * 获取当前环境的每日最大配额
    */
   static get threshold(): number {
-    return isProduction()
+    return AppEnvUtil.isProduction()
       ? GuestChatQuota.maxQuotaPerDay
       : GuestChatQuota.maxQuotaPerDayTest;
   }
@@ -54,7 +54,7 @@ export class GuestChatQuota {
    * 获取当前环境的总配额默认值
    */
   static get totalQuotaDefault(): number {
-    return isProduction()
+    return AppEnvUtil.isProduction()
       ? GuestChatQuota.defaultTotalQuota
       : GuestChatQuota.defaultTotalQuotaTest;
   }