feat: outdated version handling

backend/proxy/config/default.cjs

@@ -14,9 +14,8 @@
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 
-// ESM is not supported, and cts is not detected, so we use type-checked cjs instead.
 /** @type {import('../src/common').ConfigFile} */
-const configFile = {
+module.exports = {
   activeVersions: ['1\\.0\\.\\d+', '2\\.0\\.\\d+'],
   hiddenRoutes: ['/bulk'],
   logFormat: 'default',
@@ -31,5 +30,3 @@ const configFile = {
     dhparam: '/etc/nginx/certs/dhparam.pem',
   },
 };
-
-export default configFile;