feat(auth): 登录注册找回绑定前台 1:1 壳层/文案/协议

抽出 sign.css，统一全页登录/注册与找回/绑定视觉；中文文案与用户协议契约对齐 Auth_Service；弹层字段与 logo 同步。

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

templates/pages/page-bind-account.php

@@ -55,6 +55,12 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST' && isset($_POST['log'], $_POST['pwd'])
     }
 }
 
+remove_action('wp_footer', 'aksrt_render_footer_tabbar', 20);
+remove_action('wp_footer', 'aksrt_render_float_buttons', 30);
+add_filter('body_class', static function ($classes) {
+	$classes[] = 'page-template-user-sign';
+	return $classes;
+});
 get_header();
 ?>
 
@@ -65,7 +71,7 @@ get_header();
 			<?php if (! $oauth_data || ! is_array($oauth_data)) : ?>
 			<!-- 会话过期状态 -->
 			<div class="auth-card__expired">
-				<div class="auth-card__logo" aria-hidden="true">AK</div>
+				<div class="auth-card__logo sign-logo" aria-hidden="true"><?php if (function_exists('aksrt_get_auth_sign_logo_html')) { echo aksrt_get_auth_sign_logo_html(); } else { echo 'AK'; } // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped ?></div>
 				<h1 class="auth-card__title"><?php bloginfo('name'); ?></h1>
 				<p><?php echo esc_html(__('绑定会话已过期或无效', 'aksrt')); ?></p>
 				<a href="<?php echo esc_url(aksrt_get_login_url()); ?>" class="btn-primary btn-lg auth-card__expired-action">
@@ -76,7 +82,7 @@ get_header();
 			<?php else : ?>
 			<!-- 正常绑定表单 -->
 
-			<div class="auth-card__logo" aria-hidden="true">AK</div>
+			<div class="auth-card__logo sign-logo" aria-hidden="true"><?php if (function_exists('aksrt_get_auth_sign_logo_html')) { echo aksrt_get_auth_sign_logo_html(); } else { echo 'AK'; } // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped ?></div>
 			<h1 class="auth-card__title"><?php bloginfo('name'); ?></h1>
 			<p class="auth-card__subtitle">
 				<?php printf(esc_html__('通过 %s 登录，请绑定你的已有账号', 'aksrt'), '<strong>' . esc_html($provider_name) . '</strong>'); ?>
@@ -120,7 +126,7 @@ get_header();
 				</button>
 			</form>
 
-			<?php if (get_option('users_can_register')) :
+			<?php if (class_exists('AKSRT_Settings') ? AKSRT_Settings::registration_enabled() : get_option('users_can_register')) :
 				$register_url = aksrt_get_register_url();
 				$register_url = add_query_arg('obk', sanitize_text_field($_GET['obk']), $register_url);
 			?>