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/contracts/HttpClient/Exception/ClientExceptionInterface.php

@@ -0,0 +1,21 @@
+<?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\Contracts\HttpClient\Exception;
+
+/**
+ * When a 4xx response is returned.
+ *
+ * @author Nicolas Grekas <p@tchwork.com>
+ */
+interface ClientExceptionInterface extends HttpExceptionInterface
+{
+}

vendor/symfony/contracts/HttpClient/Exception/DecodingExceptionInterface.php

@@ -0,0 +1,21 @@
+<?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\Contracts\HttpClient\Exception;
+
+/**
+ * When a content-type cannot be decoded to the expected representation.
+ *
+ * @author Nicolas Grekas <p@tchwork.com>
+ */
+interface DecodingExceptionInterface extends ExceptionInterface
+{
+}

vendor/symfony/contracts/HttpClient/Exception/ExceptionInterface.php

@@ -0,0 +1,21 @@
+<?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\Contracts\HttpClient\Exception;
+
+/**
+ * The base interface for all exceptions in the contract.
+ *
+ * @author Nicolas Grekas <p@tchwork.com>
+ */
+interface ExceptionInterface extends \Throwable
+{
+}

vendor/symfony/contracts/HttpClient/Exception/HttpExceptionInterface.php

@@ -0,0 +1,24 @@
+<?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\Contracts\HttpClient\Exception;
+
+use Symfony\Contracts\HttpClient\ResponseInterface;
+
+/**
+ * Base interface for HTTP-related exceptions.
+ *
+ * @author Anton Chernikov <anton_ch1989@mail.ru>
+ */
+interface HttpExceptionInterface extends ExceptionInterface
+{
+    public function getResponse(): ResponseInterface;
+}

vendor/symfony/contracts/HttpClient/Exception/RedirectionExceptionInterface.php

@@ -0,0 +1,21 @@
+<?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\Contracts\HttpClient\Exception;
+
+/**
+ * When a 3xx response is returned and the "max_redirects" option has been reached.
+ *
+ * @author Nicolas Grekas <p@tchwork.com>
+ */
+interface RedirectionExceptionInterface extends HttpExceptionInterface
+{
+}

vendor/symfony/contracts/HttpClient/Exception/ServerExceptionInterface.php

@@ -0,0 +1,21 @@
+<?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\Contracts\HttpClient\Exception;
+
+/**
+ * When a 5xx response is returned.
+ *
+ * @author Nicolas Grekas <p@tchwork.com>
+ */
+interface ServerExceptionInterface extends HttpExceptionInterface
+{
+}

vendor/symfony/contracts/HttpClient/Exception/TimeoutExceptionInterface.php

@@ -0,0 +1,21 @@
+<?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\Contracts\HttpClient\Exception;
+
+/**
+ * When an idle timeout occurs.
+ *
+ * @author Nicolas Grekas <p@tchwork.com>
+ */
+interface TimeoutExceptionInterface extends TransportExceptionInterface
+{
+}

vendor/symfony/contracts/HttpClient/Exception/TransportExceptionInterface.php

@@ -0,0 +1,21 @@
+<?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\Contracts\HttpClient\Exception;
+
+/**
+ * When any error happens at the transport level.
+ *
+ * @author Nicolas Grekas <p@tchwork.com>
+ */
+interface TransportExceptionInterface extends ExceptionInterface
+{
+}