Add global autofill guard for hub, env, and transfer inputs.

Co-authored-by: Cursor <cursoragent@cursor.com>

lib/instance/templates/password_settings_panel.html

@@ -1,7 +1,7 @@
 {# 系统设置 · 账户密码(外层 card 由 settings_panel 提供) #}
 <h2>账户密码修改</h2>
 <p class="settings-subcard-desc">修改网页登录账号密码,写入 <code>.env</code> 后需重启实例生效.</p>
-<div class="settings-password-form">
+<div class="settings-password-form password-settings" data-password-settings="1">
     <label>当前密码 <input type="password" id="pwd-old" autocomplete="current-password"></label>
     <label>新用户名(可选) <input type="text" id="pwd-new-username" autocomplete="username"></label>
     <label>新密码 <input type="password" id="pwd-new" autocomplete="new-password"></label>