feat: 添加推送通知功能，支持订阅和发送通知

Web/src/api/notification.js

@@ -0,0 +1,24 @@
+import request from './request'
+
+export function getVapidPublicKey() {
+  return request({
+    url: '/notification/vapid-public-key',
+    method: 'get'
+  })
+}
+
+export function subscribe(data) {
+  return request({
+    url: '/notification/subscribe',
+    method: 'post',
+    data
+  })
+}
+
+export function testNotification(message) {
+  return request({
+    url: '/notification/test',
+    method: 'post',
+    params: { message }
+  })
+}