v2.2更新

frontend/api/save_session.php

@@ -160,6 +160,7 @@ $_SESSION['username'] = $data['username'];
 $_SESSION['real_name'] = $data['real_name'] ?? '';
 $_SESSION['role'] = $data['role'] ?? '';
 $_SESSION['login_time'] = time();
+$_SESSION['jwt_token'] = $token;
 
 // 如果是学生，额外设置 student_id
 if ($data['user_type'] === 'student') {