feat: Notification API + 自定义渲染函数 + stack独立配置完善

src/index.js

@@ -257,6 +257,18 @@ if (typeof window !== 'undefined') {
   window.MeToast = enhancedMeToast;
   window.Met = enhancedMeToast;
   window.metonaToast = enhancedMeToast;
+  
+  // Notification API — 页面不可见时自动发送系统通知
+  enhancedMeToast._notify = (toast) => {
+    if (typeof Notification === 'undefined' || Notification.permission !== 'granted') return;
+    if (!document.hidden) return;
+    try {
+      new Notification(toast.title || toast.type, { body: toast.message, icon: '/favicon.ico' });
+    } catch (_) {}
+  };
+  Toast.on('afterShow', (toast) => {
+    if (toast.config.notifyWhenHidden) enhancedMeToast._notify(toast);
+  });
 }
 
 // 导出