Add maintenance system

src/layouts/maintenance.vue

@@ -0,0 +1,22 @@
+<script setup lang="ts">
+const appConfig = useAppConfig()
+const getColor = computed(() => appConfig.ui.primary)
+</script>
+
+<template>
+  <div>
+    <NuxtLoadingIndicator :color="getColor" />
+    <section class="fixed inset-0 flex justify-center sm:px-8">
+      <div class="flex w-full max-w-7xl">
+        <div class="w-full bg-white ring-1 ring-zinc-100 dark:bg-zinc-900 dark:ring-zinc-300/20" />
+      </div>
+    </section>
+    <div class="relative z-50 min-h-[100svh]">
+      <Header :navbar="false" />
+      <UContainer>
+        <NuxtPage />
+      </UContainer>
+      <Footer />
+    </div>
+  </div>
+</template>