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/dependency-injection/Argument/ServiceLocator.php

@@ -0,0 +1,48 @@
+<?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\DependencyInjection\Argument;
+
+use Symfony\Component\DependencyInjection\ServiceLocator as BaseServiceLocator;
+
+/**
+ * @author Nicolas Grekas <p@tchwork.com>
+ *
+ * @internal
+ */
+class ServiceLocator extends BaseServiceLocator
+{
+    private \Closure $factory;
+    private array $serviceMap;
+    private ?array $serviceTypes;
+
+    public function __construct(\Closure $factory, array $serviceMap, ?array $serviceTypes = null)
+    {
+        $this->factory = $factory;
+        $this->serviceMap = $serviceMap;
+        $this->serviceTypes = $serviceTypes;
+        parent::__construct($serviceMap);
+    }
+
+    public function get(string $id): mixed
+    {
+        return match (\count($this->serviceMap[$id] ?? [])) {
+            0 => parent::get($id),
+            1 => $this->serviceMap[$id][0],
+            default => ($this->factory)(...$this->serviceMap[$id]),
+        };
+    }
+
+    public function getProvidedServices(): array
+    {
+        return $this->serviceTypes ??= array_map(static fn () => '?', $this->serviceMap);
+    }
+}