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/Compiler/AliasDeprecatedPublicServicesPass.php

@@ -0,0 +1,61 @@
+<?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\Compiler;
+
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\Exception\InvalidArgumentException;
+use Symfony\Component\DependencyInjection\Reference;
+
+final class AliasDeprecatedPublicServicesPass extends AbstractRecursivePass
+{
+    protected bool $skipScalars = true;
+
+    private array $aliases = [];
+
+    public function process(ContainerBuilder $container): void
+    {
+        foreach ($container->findTaggedServiceIds('container.private') as $id => $tags) {
+            if (null === $package = $tags[0]['package'] ?? null) {
+                throw new InvalidArgumentException(\sprintf('The "package" attribute is mandatory for the "container.private" tag on the "%s" service.', $id));
+            }
+
+            if (null === $version = $tags[0]['version'] ?? null) {
+                throw new InvalidArgumentException(\sprintf('The "version" attribute is mandatory for the "container.private" tag on the "%s" service.', $id));
+            }
+
+            $definition = $container->getDefinition($id);
+            if (!$definition->isPublic() || $definition->isPrivate()) {
+                continue;
+            }
+
+            $container
+                ->setAlias($id, $aliasId = '.container.private.'.$id)
+                ->setPublic(true)
+                ->setDeprecated($package, $version, 'Accessing the "%alias_id%" service directly from the container is deprecated, use dependency injection instead.');
+
+            $container->setDefinition($aliasId, $definition);
+
+            $this->aliases[$id] = $aliasId;
+        }
+
+        parent::process($container);
+    }
+
+    protected function processValue(mixed $value, bool $isRoot = false): mixed
+    {
+        if ($value instanceof Reference && isset($this->aliases[$id = (string) $value])) {
+            return new Reference($this->aliases[$id], $value->getInvalidBehavior());
+        }
+
+        return parent::processValue($value, $isRoot);
+    }
+}