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/phpdocumentor/guides-graphs/resources/template/html/body/uml.html.twig

@@ -0,0 +1,8 @@
+<figure class="uml-diagram{% if node.classesString %} {{ node.classesString }}{% endif %}"
+    {%- if node.hasOption('width') %} style="width: {{ node.option('width') }}"{% endif -%}
+>
+    {{ uml(node.value) }}
+    {% if node.caption %}
+    <figcaption>{{ node.caption }}</figcaption>
+    {% endif %}
+</figure>