chore: update to nuxt 3.20 (#4992)

* feat: nuxt 3.14 → 3.15.4

* feat: nuxt 3.15.4 → 3.16.2 (vite 6)

* feat: bump nuxt-i18n

* feat: nuxt 3.20

* fix: lint

* feat: use rolldown-vite

* fix: shut the fuck up

* fix: silence for app as well

* fix: vue-router mismatch

---------

Signed-off-by: Calum H. <contact@cal.engineer>

apps/frontend/i18n/i18n.config.ts

@@ -0,0 +1,19 @@
+import { buildLocaleMessages, createMessageCompiler, type CrowdinMessages } from '@modrinth/ui'
+
+const localeModules = import.meta.glob<{ default: CrowdinMessages }>(
+	'../src/locales/*/index.json',
+	{
+		eager: true,
+	},
+)
+
+export default defineI18nConfig(() => ({
+	legacy: false,
+	locale: 'en-US',
+	fallbackLocale: 'en-US',
+	messageCompiler: createMessageCompiler(),
+	missingWarn: false,
+	fallbackWarn: false,
+	// @ts-expect-error - buildLocaleMessages returns compatible format at runtime
+	messages: buildLocaleMessages(localeModules),
+}))