Refactor authentication: streamline cookie handling and enhance username retrieval in responses

api/auth/login.php

@@ -40,7 +40,6 @@ if ($result && password_verify($password, $result[0]["password"])) {
 
     // Set cookies
     setcookie("auth_token", $token, time() + 86400, "/");
-    setcookie("username", $username, time() + 86400, "/");
 
     $api->answer(200);
 }else{