Make Ladill Link short URLs fully dynamic at click time.

Forward query strings and path suffixes to the live destination, resolve public hosts from config/custom domains instead of hardcoding ladl.link, and keep proxy Location rewrites on the visitor host.

app/Http/Controllers/Link/SettingsController.php

@@ -33,7 +33,9 @@ class SettingsController extends Controller
         if ($validated['domain'] === 'platform') {
             LinkCustomDomain::where('user_id', $account->id)->update(['is_default' => false]);
 
-            return back()->with('success', 'Default short-link domain set to ladl.link.');
+            $domain = (string) config('link.public_domain', 'ladl.link');
+
+            return back()->with('success', 'Default short-link domain set to '.$domain.'.');
         }
 
         $domain = LinkCustomDomain::query()