refactor(i18n): use JSON with flattened key and namespace (#30114)

Co-authored-by: yyh <yuanyouhuilyz@gmail.com>
Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>

web/app/components/apps/empty.tsx

@@ -25,7 +25,7 @@ const Empty = () => {
       <DefaultCards />
       <div className="pointer-events-none absolute inset-0 z-20 flex items-center justify-center bg-gradient-to-t from-background-body to-transparent">
         <span className="system-md-medium text-text-tertiary">
-          {t('app.newApp.noAppsFound')}
+          {t('newApp.noAppsFound', { ns: 'app' })}
         </span>
       </div>
     </>