feat(pwa): add PWA support with auto-update and install prompt

src/App.vue

@@ -4,6 +4,7 @@ import { useRouter } from 'vue-router'
 import Header from './components/Header.vue'
 import Footer from './components/Footer.vue'
 import Sidebar from './components/Sidebar.vue'
+import InstallPrompt from './components/InstallPrompt.vue'
 
 const isSidebarOpen = ref(window.innerWidth >= 768)
 const router = useRouter()
@@ -51,6 +52,7 @@ onUnmounted(() => {
     </main>
   </div>
   <Footer />
+  <InstallPrompt />
 </template>
 
 <style scoped>