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

vite.config.js

@@ -1,10 +1,37 @@
 import { defineConfig } from 'vite'
 import vue from '@vitejs/plugin-vue'
+import { VitePWA } from 'vite-plugin-pwa'
 import packageJson from './package.json'
 
 // https://vite.dev/config/
 export default defineConfig({
-  plugins: [vue()],
+  plugins: [
+    vue(),
+    VitePWA({
+      registerType: 'autoUpdate',
+      includeAssets: ['favicon.svg'],
+      manifest: {
+        name: 'Tools App',
+        short_name: 'Tools',
+        description: 'A collection of useful tools',
+        theme_color: '#242424',
+        background_color: '#242424',
+        display: 'standalone',
+        orientation: 'portrait',
+        icons: [
+          {
+            src: 'favicon.svg',
+            sizes: 'any',
+            type: 'image/svg+xml',
+            purpose: 'any maskable'
+          }
+        ]
+      },
+      workbox: {
+        globPatterns: ['**/*.{js,css,html,ico,png,svg,json,vue,txt,woff2}']
+      }
+    })
+  ],
   define: {
     '__APP_VERSION__': JSON.stringify(packageJson.version)
   }