fix(notification): expand screen lock init condition for unit tests

1. Added fallback condition to call initScreenLockedState() when platform
   name is non-empty, ensuring the function runs on Wayland as well
2. Previously skipped on Wayland only; now also handles empty platform
   name case that occurs in unit test environments
3. Marks intention for subsequent migration to the login1 interface

Log: Expand screen lock initialization condition to work in unit test and Wayland environments

fix(notification): 扩展屏幕锁定初始化条件以支持单元测试

1. 新增 platformName 非空时的回退条件，确保在 Wayland 上也能调用
   initScreenLockedState()
2. 原先仅在 Wayland 时跳过；现在同时处理单元测试环境中
   platformName 为空的情况
3. 标注了后续迁移至 login1 接口的意图

Log: 扩展屏幕锁定初始化条件，兼容单元测试和 Wayland 环境

Author: mhduiy

panels/notification/server/notificationmanager.cpp

@@ -81,7 +81,8 @@ NotificationManager::NotificationManager(QObject *parent)
     if(!config->value("notificationCleanupDays").isNull()) {
         m_cleanupDays = config->value("notificationCleanupDays").toInt();
     } 
-    if (QStringLiteral("wayland") != QGuiApplication::platformName()) {
+    if (QStringLiteral("wayland") != QGuiApplication::platformName() 
+        && !QGuiApplication::platformName().isEmpty()) { // for unit test, Subsequent migration to the login1 interface
         initScreenLockedState();
     }
 }