Add cookie token lifetime configuration and implement base64 encoding/decoding methods

api/setup/save.php

@@ -90,6 +90,7 @@ $api_token = bin2hex(random_bytes(32));
 $env .= "API_TOKEN_SIGNATURE=" . $api_token . "\n";
 
 $env .= "DB_FILE=database.db";
+$env .= "COOKIE_TOKEN_LIFETIME=86400";
 
 file_put_contents(APP_PATH . ".env", $env);