feat: support custom email pool in the merged dev registration flow

- 吸收 dev 最新 sidepanel 与收码链路改动，保留 Cloudflare Temp Email 独立设置区、贡献模式自动前提醒和 2925 当前账号恢复接线

- 修复生成邮箱辅助层对运行态参数的判断，避免 Gmail 别名与自定义邮箱池误用旧的已保存状态

- 补充自定义邮箱池相关测试与文档，更新 README、项目结构说明和完整链路说明

sidepanel/sidepanel.html

@@ -112,6 +112,7 @@
         <select id="select-panel-mode" class="data-select">
           <option value="cpa">CPA 面板</option>
           <option value="sub2api">SUB2API</option>
+          <option value="codex2api">Codex2API</option>
         </select>
       </div>
       <div id="contribution-mode-panel" class="contribution-mode-panel" hidden>
@@ -192,6 +193,16 @@
         <input type="text" id="input-sub2api-default-proxy" class="data-input"
           placeholder="留空则不使用代理；或填写代理名称 / ID" />
       </div>
+      <div class="data-row" id="row-codex2api-url" style="display:none;">
+        <span class="data-label">Codex2API</span>
+        <input type="text" id="input-codex2api-url" class="data-input"
+          placeholder="http://localhost:8080/admin/accounts" />
+      </div>
+      <div class="data-row" id="row-codex2api-admin-key" style="display:none;">
+        <span class="data-label">管理密钥</span>
+        <input type="password" id="input-codex2api-admin-key" class="data-input"
+          placeholder="请输入 Codex2API Admin Secret" />
+      </div>
       <div class="data-row" id="row-custom-password">
         <span class="data-label">账户密码</span>
         <div class="input-with-icon">
@@ -242,31 +253,6 @@
         <textarea id="input-custom-email-pool" class="data-textarea"
           placeholder="每行一个邮箱，例如&#10;alias001@gmail.com&#10;alias002@gmail.com"></textarea>
       </div>
-      <div class="data-row" id="row-temp-email-base-url" style="display:none;">
-        <span class="data-label">Temp API</span>
-        <input type="text" id="input-temp-email-base-url" class="data-input" placeholder="https://your-worker-domain" />
-      </div>
-      <div class="data-row" id="row-temp-email-admin-auth" style="display:none;">
-        <span class="data-label">Admin Auth</span>
-        <input type="password" id="input-temp-email-admin-auth" class="data-input data-input-with-icon" placeholder="Cloudflare Temp Email admin password" />
-      </div>
-      <div class="data-row" id="row-temp-email-custom-auth" style="display:none;">
-        <span class="data-label">Custom Auth</span>
-        <input type="password" id="input-temp-email-custom-auth" class="data-input data-input-with-icon" placeholder="仅当站点启用了访问密码时再填写；这是额外鉴权，不替代 Admin Auth。" />
-      </div>
-      <div class="data-row" id="row-temp-email-receive-mailbox" style="display:none;">
-        <span class="data-label">邮件接收</span>
-        <input type="text" id="input-temp-email-receive-mailbox" class="data-input" placeholder="用于接收转发邮件的邮箱，例如 1@email.example.com" />
-      </div>
-      <div class="data-row" id="row-temp-email-domain" style="display:none;">
-        <span class="data-label">Temp 域名</span>
-        <div class="data-inline">
-          <select id="select-temp-email-domain" class="data-select"></select>
-          <input type="text" id="input-temp-email-domain" class="data-input" placeholder="例如 mail.example.com"
-            style="display:none;" />
-          <button id="btn-temp-email-domain-mode" class="btn btn-outline btn-sm" type="button">添加</button>
-        </div>
-      </div>
       <div class="data-row" id="row-cf-domain" style="display:none;">
         <span class="data-label">CF 域名</span>
         <div class="data-inline">
@@ -396,6 +382,56 @@
       </div>
     </div>
     </div>
+    <div id="cloudflare-temp-email-section" class="data-card hotmail-card" style="display:none;">
+      <div class="section-mini-header">
+        <div class="section-mini-copy">
+          <span class="section-label">Cloudflare Temp Email</span>
+          <span class="data-value">用于生成邮箱或接收转发邮件</span>
+        </div>
+        <div class="section-mini-actions">
+          <button id="btn-cloudflare-temp-email-usage-guide" class="btn btn-ghost btn-xs" type="button">使用教程</button>
+          <button id="btn-cloudflare-temp-email-github" class="btn btn-ghost btn-xs" type="button">GitHub</button>
+        </div>
+      </div>
+      <div class="data-row" id="row-temp-email-base-url" style="display:none;">
+        <span class="data-label">Temp API</span>
+        <input type="text" id="input-temp-email-base-url" class="data-input" placeholder="https://your-worker-domain" />
+      </div>
+      <div class="data-row" id="row-temp-email-admin-auth" style="display:none;">
+        <span class="data-label">Admin Auth</span>
+        <input type="password" id="input-temp-email-admin-auth" class="data-input data-input-with-icon" placeholder="Cloudflare Temp Email admin password" />
+      </div>
+      <div class="data-row" id="row-temp-email-custom-auth" style="display:none;">
+        <span class="data-label">Custom Auth</span>
+        <input type="password" id="input-temp-email-custom-auth" class="data-input data-input-with-icon" placeholder="仅当站点启用了访问密码时再填写；这是额外鉴权，不替代 Admin Auth。" />
+      </div>
+      <div class="data-row" id="row-temp-email-receive-mailbox" style="display:none;">
+        <span class="data-label">邮件接收</span>
+        <input type="text" id="input-temp-email-receive-mailbox" class="data-input" placeholder="用于接收转发邮件的邮箱，例如 1@email.example.com" />
+      </div>
+      <div class="data-row" id="row-temp-email-random-subdomain-toggle" style="display:none;">
+        <span class="data-label">随机子域</span>
+        <div class="data-inline">
+          <label class="toggle-switch" for="input-temp-email-use-random-subdomain" title="依赖后端 RANDOM_SUBDOMAIN_DOMAINS 配置">
+            <input type="checkbox" id="input-temp-email-use-random-subdomain" />
+            <span class="toggle-switch-track" aria-hidden="true">
+              <span class="toggle-switch-thumb"></span>
+            </span>
+            <span>启用</span>
+          </label>
+          <span class="setting-caption">依赖后端 RANDOM_SUBDOMAIN_DOMAINS</span>
+        </div>
+      </div>
+      <div class="data-row" id="row-temp-email-domain" style="display:none;">
+        <span class="data-label">Temp 域名</span>
+        <div class="data-inline">
+          <select id="select-temp-email-domain" class="data-select"></select>
+          <input type="text" id="input-temp-email-domain" class="data-input" placeholder="例如 mail.example.com"
+            style="display:none;" />
+          <button id="btn-temp-email-domain-mode" class="btn btn-outline btn-sm" type="button">添加</button>
+        </div>
+      </div>
+    </div>
     <div id="hotmail-section" class="data-card hotmail-card" style="display:none;">
       <div class="section-mini-header">
         <div class="section-mini-copy">