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>

inc/classes/scripts-traits/trait-aksrt-scripts-part-1b.php

@@ -532,6 +532,16 @@ trait AKSRT_Scripts_Part_1b {
                     ? (string) filemtime(get_template_directory() . '/assets/css/routes/auth.css')
                     : $version
             );
+
+            $sign_css = get_template_directory() . '/assets/css/routes/sign.css';
+            if (file_exists($sign_css)) {
+                wp_enqueue_style(
+                    'aksrt-route-sign',
+                    $base_uri . '/assets/css/routes/sign.css',
+                    ['aksrt-tokens'],
+                    (string) filemtime($sign_css)
+                );
+            }
             // 手机号注册/登录 + SMS 倒计时 + 人机验证联动
             $sign_js_path = get_template_directory() . '/assets/js/sign-register.js';
             if (file_exists($sign_js_path)) {

inc/classes/settings/trait-aksrt-settings-auth-reader.php

@@ -208,4 +208,13 @@ trait AKSRT_Settings_Auth_Reader {
         return ['type' => $type, 'domains' => $domains];
     }
 
+
+    /** 用户协议前台配置（enabled / required / page） */
+    public static function user_agreement_settings(): array {
+        return [
+            'enabled'  => !isset(self::get_all()['user_agreement_s']) || !empty(self::get_value('user_agreement_s', true)),
+            'required' => !isset(self::get_all()['user_agreement_check']) || !empty(self::get_value('user_agreement_check', true)),
+            'page'     => trim((string) self::get_value('user_agreement_page', '')),
+        ];
+    }
 }