update

config/config.php

@@ -6,8 +6,22 @@ ini_set('display_errors', '1');
 ini_set('display_startup_errors', '1');
 error_reporting(E_ALL);
 
-require_once __DIR__ . '/settings.php';
-require_once __DIR__ . '/domaindata.php';
+// Pick config set: first try root files, otherwise fall back to env dir (prod/staging/...)
+$appEnvFromEnv = getenv('APP_ENV') ?: 'prod';
+$envDir        = rtrim(__DIR__, '/\\') . '/' . $appEnvFromEnv;
+
+foreach (['settings.php', 'domaindata.php'] as $cfgFile) {
+    $rootPath = __DIR__ . '/' . $cfgFile;
+    $envPath  = $envDir . '/' . $cfgFile;
+
+    if (file_exists($rootPath)) {
+        require_once $rootPath;
+    } elseif (file_exists($envPath)) {
+        require_once $envPath;
+    } else {
+        throw new \RuntimeException("Missing required config file: $cfgFile (looked for $rootPath or $envPath)");
+    }
+}
 
 
 // Environment: staging|prod|local (example)