refactor: Cleanup git state - commit all staged changes

Major refactoring cleanup:
- Add new controller architecture (class-controller-*.php)
- Add new settings-v2 UI (views/settings-v2/)
- Add new CSS architecture (agentic-sidebar.css, tokens)
- Add esbuild build pipeline (scripts/build.js, package.json)
- Add composer dependencies (vendor/)
- Add frontend src directory (assets/js/src/index.jsx)
- Add documentation files
- Remove old/obsolete files (class-settings.php, old CSS)

This commits all pending changes from previous refactoring efforts.

vendor/symfony/routing/Loader/Configurator/Traits/HostTrait.php

@@ -0,0 +1,50 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Routing\Loader\Configurator\Traits;
+
+use Symfony\Component\Routing\RouteCollection;
+
+/**
+ * @internal
+ */
+trait HostTrait
+{
+    final protected function addHost(RouteCollection $routes, string|array $hosts): void
+    {
+        if (!$hosts || !\is_array($hosts)) {
+            $routes->setHost($hosts ?: '');
+
+            return;
+        }
+
+        foreach ($routes->all() as $name => $route) {
+            if (null === $locale = $route->getDefault('_locale')) {
+                $priority = $routes->getPriority($name) ?? 0;
+                $routes->remove($name);
+                foreach ($hosts as $locale => $host) {
+                    $localizedRoute = clone $route;
+                    $localizedRoute->setDefault('_locale', $locale);
+                    $localizedRoute->setRequirement('_locale', preg_quote($locale));
+                    $localizedRoute->setDefault('_canonical_route', $name);
+                    $localizedRoute->setHost($host);
+                    $routes->add($name.'.'.$locale, $localizedRoute, $priority);
+                }
+            } elseif (!isset($hosts[$locale])) {
+                throw new \InvalidArgumentException(\sprintf('Route "%s" with locale "%s" is missing a corresponding host in its parent collection.', $name, $locale));
+            } else {
+                $route->setHost($hosts[$locale]);
+                $route->setRequirement('_locale', preg_quote($locale));
+                $routes->add($name, $route, $routes->getPriority($name) ?? 0);
+            }
+        }
+    }
+}