更新前端静态网页获取方式，放弃使用后端获取api

frontend/node_modules/workbox-precaching/cleanupOutdatedCaches.d.ts

@@ -0,0 +1,9 @@
+import './_version.js';
+/**
+ * Adds an `activate` event listener which will clean up incompatible
+ * precaches that were created by older versions of Workbox.
+ *
+ * @memberof workbox-precaching
+ */
+declare function cleanupOutdatedCaches(): void;
+export { cleanupOutdatedCaches };