Expand Link app with analytics, settings, and custom domains.

Add Bitly-style branded domain support via Ladill Domains SSL API,
account analytics dashboard, settings page with default domain picker,
and fix SSO/dashboard issues from QR Plus template leftovers.

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

config/services.php

@@ -23,7 +23,7 @@ return [
         'issuer' => 'https://'.config('app.auth_domain'),
         'client_id' => env('LADILL_SSO_CLIENT_ID'),
         'client_secret' => env('LADILL_SSO_CLIENT_SECRET'),
-        'redirect' => rtrim((string) env('APP_URL', 'https://qrplus.ladill.com'), '/').'/sso/callback',
+        'redirect' => rtrim((string) env('APP_URL', 'https://link.ladill.com'), '/').'/sso/callback',
     ],
 
     'ladill_webmail' => [