fix: 收敛 2925 邮箱修复范围

- 回退非必要的 2925 行为改动，仅保留已验证有效的修复
- 保留 bounce 转发地址解析、中文日期解析与邮箱页复用时的 ready 恢复
- 同步最小化测试断言，保持当前代码与测试一致

content/mail-2925.js

@@ -1,13 +1,6 @@
 // content/mail-2925.js - Content script for 2925 Mail (steps 4, 8)
 // Injected dynamically on: 2925.com
 
-(function initMail2925ContentScript() {
-if (window.__MULTIPAGE_MAIL2925_SCRIPT_LOADED__) {
-  console.log('[MultiPage:mail-2925] Duplicate injection skipped on', location.href);
-  return;
-}
-window.__MULTIPAGE_MAIL2925_SCRIPT_LOADED__ = true;
-
 const MAIL2925_PREFIX = '[MultiPage:mail-2925]';
 const isTopFrame = window === window.top;
 
@@ -1223,4 +1216,3 @@ async function handlePollEmail(step, payload) {
 }
 
 }
-})();

content/signup-page.js

@@ -2,7 +2,6 @@
 // Injected on: auth0.openai.com, auth.openai.com, accounts.openai.com
 // Dynamically injected on: chatgpt.com
 
-(function initSignupPageContentScript() {
 console.log('[MultiPage:signup-page] Content script loaded on', location.href);
 
 const SIGNUP_PAGE_LISTENER_SENTINEL = 'data-multipage-signup-page-listener';
@@ -3561,4 +3560,3 @@ async function step5_fillNameBirthday(payload) {
   log('步骤 5：已点击“完成帐户创建”，当前步骤直接完成，不再等待页面结果。');
   return completionPayload;
 }
-})();

content/utils.js

@@ -1,6 +1,6 @@
 // content/utils.js — Shared utilities for all content scripts
 
-var getActivationStrategy = self.MultiPageActivationUtils?.getActivationStrategy;
+const getActivationStrategy = self.MultiPageActivationUtils?.getActivationStrategy;
 
 function detectScriptSource({
   injectedSource,
@@ -26,7 +26,7 @@ function detectScriptSource({
   return 'vps-panel';
 }
 
-var SCRIPT_SOURCE = (() => {
+const SCRIPT_SOURCE = (() => {
   return detectScriptSource({
     injectedSource: window.__MULTIPAGE_SOURCE,
     url: location.href,
@@ -38,9 +38,9 @@ function getRuntimeScriptSource() {
   return window.__MULTIPAGE_SOURCE || SCRIPT_SOURCE;
 }
 
-var LOG_PREFIX = `[MultiPage:${SCRIPT_SOURCE}]`;
-var STOP_ERROR_MESSAGE = '流程已被用户停止。';
-var flowStopped = false;
+const LOG_PREFIX = `[MultiPage:${SCRIPT_SOURCE}]`;
+const STOP_ERROR_MESSAGE = '流程已被用户停止。';
+let flowStopped = false;
 
 if (!window.__MULTIPAGE_UTILS_LISTENER_READY__) {
   window.__MULTIPAGE_UTILS_LISTENER_READY__ = true;