migrate to "export default"

also, set no-use-before-define in linter

src/routes/filemanager.js

@@ -5,9 +5,6 @@ import { HttpError } from '@cloudron/connect-lastmile';
 import safe from 'safetydance';
 import services from '../services.js';
 
-export {
-    proxy,
-};
 
 function proxy(kind) {
     assert(kind === 'mail' || kind === 'volume' || kind === 'app');
@@ -53,3 +50,7 @@ function proxy(kind) {
           }
       };
 }
+
+export default {
+    proxy,
+};