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/polyfill-intl-normalizer/bootstrap80.php

@@ -0,0 +1,22 @@
+<?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.
+ */
+
+use Symfony\Polyfill\Intl\Normalizer as p;
+
+if (!function_exists('normalizer_is_normalized')) {
+    function normalizer_is_normalized(?string $string, ?int $form = p\Normalizer::FORM_C): bool { return p\Normalizer::isNormalized((string) $string, (int) $form); }
+}
+if (!function_exists('normalizer_normalize')) {
+    function normalizer_normalize(?string $string, ?int $form = p\Normalizer::FORM_C): string|false { return p\Normalizer::normalize((string) $string, (int) $form); }
+}
+if (!function_exists('normalizer_get_raw_decomposition')) {
+    function normalizer_get_raw_decomposition(?string $string, ?int $form = p\Normalizer::FORM_C): ?string { return p\Normalizer::getRawDecomposition((string) $string, (int) $form); }
+}