Initial setup for new frontend.

frontend/src/main.ts

@@ -0,0 +1,12 @@
+import { createApp } from "vue";
+import { createPinia } from "pinia";
+
+import App from "./App.vue";
+import router from "./router";
+
+const app = createApp(App);
+
+app.use(createPinia());
+app.use(router);
+
+app.mount("#app");