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/cache/Traits/Relay/Relay121Trait.php

@@ -0,0 +1,51 @@
+<?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\Cache\Traits\Relay;
+
+if (version_compare(phpversion('relay'), '0.12.1', '>=')) {
+    /**
+     * @internal
+     */
+    trait Relay121Trait
+    {
+        public function hgetWithMeta($hash, $member): \Relay\Relay|array|false
+        {
+            return ($this->lazyObjectState->realInstance ??= ($this->lazyObjectState->initializer)())->hgetWithMeta(...\func_get_args());
+        }
+
+        public function select($db): \Relay\Relay|bool|string
+        {
+            return ($this->lazyObjectState->realInstance ??= ($this->lazyObjectState->initializer)())->select(...\func_get_args());
+        }
+
+        public function watch($key, ...$other_keys): \Relay\Relay|bool|string
+        {
+            return ($this->lazyObjectState->realInstance ??= ($this->lazyObjectState->initializer)())->watch(...\func_get_args());
+        }
+    }
+} else {
+    /**
+     * @internal
+     */
+    trait Relay121Trait
+    {
+        public function select($db): \Relay\Relay|bool
+        {
+            return ($this->lazyObjectState->realInstance ??= ($this->lazyObjectState->initializer)())->select(...\func_get_args());
+        }
+
+        public function watch($key, ...$other_keys): \Relay\Relay|bool
+        {
+            return ($this->lazyObjectState->realInstance ??= ($this->lazyObjectState->initializer)())->watch(...\func_get_args());
+        }
+    }
+}