Convert backend to ESM

- About 5 years overdue
- Remove eslint, use bomejs instead

backend/lib/express/jwt-decode.js

@@ -1,10 +1,11 @@
-const Access = require('../access');
+import Access from "../access.js";
 
-module.exports = () => {
-	return function (req, res, next) {
+export default () => {
+	return (_, res, next) => {
 		res.locals.access = null;
-		let access        = new Access(res.locals.token || null);
-		access.load()
+		const access = new Access(res.locals.token || null);
+		access
+			.load()
 			.then(() => {
 				res.locals.access = access;
 				next();
@@ -12,4 +13,3 @@ module.exports = () => {
 			.catch(next);
 	};
 };
-