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/DirectoryLoader.php

@@ -0,0 +1,52 @@
+<?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;
+
+use Symfony\Component\Config\Loader\FileLoader;
+use Symfony\Component\Config\Resource\DirectoryResource;
+use Symfony\Component\Routing\RouteCollection;
+
+class DirectoryLoader extends FileLoader
+{
+    public function load(mixed $file, ?string $type = null): mixed
+    {
+        $path = $this->locator->locate($file);
+
+        $collection = new RouteCollection();
+        $collection->addResource(new DirectoryResource($path));
+
+        foreach (scandir($path) as $dir) {
+            if ('.' !== $dir[0]) {
+                $this->setCurrentDir($path);
+                $subPath = $path.'/'.$dir;
+                $subType = null;
+
+                if (is_dir($subPath)) {
+                    $subPath .= '/';
+                    $subType = 'directory';
+                }
+
+                $subCollection = $this->import($subPath, $subType, false, $path);
+                $collection->addCollection($subCollection);
+            }
+        }
+
+        return $collection;
+    }
+
+    public function supports(mixed $resource, ?string $type = null): bool
+    {
+        // only when type is forced to directory, not to conflict with AttributeLoader
+
+        return 'directory' === $type;
+    }
+}