Add PWA support with install banner and app icons

- Configure @vite-pwa/nuxt module with manifest and service worker
- Add PWA install banner component to login page
- Include app icons (192x192, 512x512) and favicon assets
- Update admin dashboard layout and remove backup section
- Add PWA-related API endpoints and utility scripts

pages/dashboard/admin.vue

@@ -107,7 +107,7 @@
 
     <!-- System Metrics -->
     <v-row class="mb-6">
-      <v-col cols="12" md="8">
+      <v-col cols="12">
         <v-card elevation="2">
           <v-card-title class="pa-4" style="background-color: #f5f5f5;">
             <v-icon class="mr-2" color="primary">mdi-chart-line</v-icon>
@@ -135,35 +135,6 @@
           </v-card-text>
         </v-card>
       </v-col>
-      
-      <v-col cols="12" md="4">
-        <v-card elevation="2">
-          <v-card-title class="pa-4" style="background-color: #f5f5f5;">
-            <v-icon class="mr-2" color="primary">mdi-backup-restore</v-icon>
-            Last Backup
-          </v-card-title>
-          <v-card-text class="pa-4">
-            <div class="text-h6 mb-2">System Backup</div>
-            <div class="text-body-2 mb-2">
-              <v-icon size="small" class="mr-1">mdi-calendar</v-icon>
-              {{ lastBackup.date }}
-            </div>
-            <div class="text-body-2 mb-4">
-              <v-icon size="small" class="mr-1">mdi-clock</v-icon>
-              {{ lastBackup.time }}
-            </div>
-            <v-btn 
-              color="primary" 
-              variant="outlined" 
-              size="small"
-              style="border-color: #a31515; color: #a31515;"
-              @click="initiateBackup"
-            >
-              Create Backup
-            </v-btn>
-          </v-card-text>
-        </v-card>
-      </v-col>
     </v-row>
 
     <!-- Recent Admin Activity -->
@@ -359,10 +330,6 @@ const systemStats = ref({
   uptime: '0d'
 });
 
-const lastBackup = ref({
-  date: 'January 7, 2025',
-  time: '3:00 AM EST'
-});
 
 const systemHealth = ref({
   cpu: 45,
@@ -460,9 +427,6 @@ const navigateToSystemConfig = () => {
   console.log('Navigate to system config');
 };
 
-const initiateBackup = () => {
-  console.log('Initiate system backup');
-};
 
 const createNewUser = () => {
   console.log('Create new user');
@@ -487,8 +451,8 @@ const systemMaintenance = () => {
 }
 
 .v-card:hover {
-  transform: translateY(-2px);
-  transition: transform 0.2s ease-in-out;
+  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
+  transition: box-shadow 0.2s ease;
 }
 
 .v-btn {

pages/login.vue

@@ -114,6 +114,9 @@
       v-model="showForgotPassword"
       @success="handlePasswordResetSuccess"
     />
+
+    <!-- PWA Install Banner -->
+    <PWAInstallBanner />
   </div>
 </template>