refactor(chat): remove redundant auth state management from ChatScreen documentation

refactor(chat): update guest chat quota logic to use isProduction utility
fix(user): add TODO for user initialization event on login status change

src/data/dto/chat/guest_chat_quota.ts

@@ -6,6 +6,7 @@ import {
   type GuestChatQuotaInput,
   type GuestChatQuotaData,
 } from "@/data/schemas/chat/guest_chat_quota";
+import { isProduction } from "@/utils/app-env";
 
 export class GuestChatQuota {
   // 静态常量
@@ -13,7 +14,7 @@ export class GuestChatQuota {
   static readonly maxQuotaPerDayTest = 4;
 
   static readonly defaultTotalQuota = 50;
-  static readonly defaultTotalQuotaDev = 5;
+  static readonly defaultTotalQuotaTest = 5;
   static readonly quotaExhausted = 0;
 
   declare readonly remaining: number;
@@ -40,29 +41,22 @@ export class GuestChatQuota {
     return GuestChatQuota.quotaExhausted;
   }
 
-  /**
-   * 是否处于开发环境
-   */
-  static get isDevelopment(): boolean {
-    return process.env.NODE_ENV !== "production";
-  }
-
   /**
    * 获取当前环境的每日最大配额
    */
   static get threshold(): number {
-    return GuestChatQuota.isDevelopment
-      ? GuestChatQuota.maxQuotaPerDayTest
-      : GuestChatQuota.maxQuotaPerDay;
+    return isProduction()
+      ? GuestChatQuota.maxQuotaPerDay
+      : GuestChatQuota.maxQuotaPerDayTest;
   }
 
   /**
    * 获取当前环境的总配额默认值
    */
   static get totalQuotaDefault(): number {
-    return GuestChatQuota.isDevelopment
-      ? GuestChatQuota.defaultTotalQuotaDev
-      : GuestChatQuota.defaultTotalQuota;
+    return isProduction()
+      ? GuestChatQuota.defaultTotalQuota
+      : GuestChatQuota.defaultTotalQuotaTest;
   }
 
   /**