fix(imports): convert require() to ESM import for randomBytes in auth.js

server/logger.js

@@ -5,8 +5,6 @@
  * Steuerung: LOG_LEVEL env var (debug, info, warn, error). Default: info.
  */
 
-'use strict';
-
 const LEVELS = { debug: 0, info: 1, warn: 2, error: 3 };
 const currentLevel = LEVELS[process.env.LOG_LEVEL] ?? LEVELS.info;
 const isProduction = process.env.NODE_ENV === 'production';
@@ -37,4 +35,4 @@ function createLogger(mod) {
   };
 }
 
-module.exports = { createLogger };
+export { createLogger };