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/property-access/PropertyAccess.php

@@ -0,0 +1,40 @@
+<?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\PropertyAccess;
+
+/**
+ * Entry point of the PropertyAccess component.
+ *
+ * @author Bernhard Schussek <bschussek@gmail.com>
+ */
+final class PropertyAccess
+{
+    /**
+     * Creates a property accessor with the default configuration.
+     */
+    public static function createPropertyAccessor(): PropertyAccessor
+    {
+        return self::createPropertyAccessorBuilder()->getPropertyAccessor();
+    }
+
+    public static function createPropertyAccessorBuilder(): PropertyAccessorBuilder
+    {
+        return new PropertyAccessorBuilder();
+    }
+
+    /**
+     * This class cannot be instantiated.
+     */
+    private function __construct()
+    {
+    }
+}