Fix guest entry: correct marketing URL and stop auto silent SSO.

Correct localhost marketing_url default and stop redirecting guests through
/sso/connect on visit; SSO starts only via explicit sign-in.

Co-authored-by: Cursor <cursoragent@cursor.com>

config/ladill.php

@@ -2,5 +2,5 @@
 
 return [
     'product_slug' => 'merchant',
-    'marketing_url' => env('LADILL_MARKETING_URL', 'https://localhost/products/merchant'),
+    'marketing_url' => env('LADILL_MARKETING_URL', 'https://ladill.com/products/merchant'),
 ];