Update Vite from v3 to v6

- vite: 3.2.8 → 6.4.1
- @vitejs/plugin-vue: 3.2.0 → 5.2.4
- Replaced @intlify/vite-plugin-vue-i18n with @intlify/unplugin-vue-i18n
- Narrowed i18n include pattern to *.json to avoid parsing .mjs files

This resolves the esbuild moderate severity vulnerability that was
present in Vite <=6.1.6.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

package.json

@@ -29,7 +29,7 @@
     "@aws-sdk/client-s3": "^3.341.0",
     "@headlessui/vue": "^1.7.23",
     "@heroicons/vue": "^2.2.0",
-    "@intlify/vite-plugin-vue-i18n": "^6.0.3",
+    "@intlify/unplugin-vue-i18n": "^11.0.3",
     "@sentry/node": "^10.38.0",
     "console-stamp": "^3.0.6",
     "cron": "^2.1.0",
@@ -56,7 +56,7 @@
   },
   "devDependencies": {
     "@dword-design/eslint-plugin-import-alias": "^5.0.0",
-    "@vitejs/plugin-vue": "^3.1.0",
+    "@vitejs/plugin-vue": "^5.2.4",
     "@vue/eslint-config-airbnb": "^8.0.0",
     "autoprefixer": "^10.4.12",
     "eslint": "^8.23.1",
@@ -65,6 +65,6 @@
     "eslint-plugin-vue": "^9.5.1",
     "postcss": "^8.4.16",
     "tailwindcss": "^3.1.8",
-    "vite": "^3.1.3"
+    "vite": "^6.4.1"
   }
 }