Use repr for user name so we can see funny chars

src/fontra_rcjk/projectmanager.py

@@ -51,7 +51,7 @@ async def loginHandler(self, request):
         username = formContent["username"][0]
         password = formContent["password"][0]
         remote = request.headers.get("X-FORWARDED-FOR", request.remote)
-        logger.info(f"login for {username} from {remote}")
+        logger.info(f"login for {username!r} from {remote}")
         token = await self.login(username, password)
 
         destination = request.query.get("ref", "/")