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/json-path/README.md

@@ -0,0 +1,32 @@
+# JSON-path
+
+JSON-path is a simple JSON path parser and evaluator for PHP. It is based on the JSONPath 
+implementation in [Goessner's JSONPath](http://goessner.net/articles/JsonPath/). 
+The code allows you to parse json paths and evaluate them on php objects. Which makes it a query language for 
+php object structures.
+
+It's propably not the fastest solution to query php objects, but as the paths are stored as plain strings, it's
+easy to use them in configuration files or databases. This makes is a good solution for tools that need to query 
+a php object structure based on user input.
+
+## Installation
+
+The recommended way to install JSON-path is through [Composer](http://getcomposer.org).
+
+```bash
+  composer require phpdocumentor/json-path
+```
+
+## Usage
+
+```php  
+
+$parser = \phpDocumentor\JsonPath\Parser::createInstance();
+$query = $parser->parse('.store.book[*].author');
+
+$executor = new \phpDocumentor\JsonPath\Executor();
+foreach ($executor->execute($query, $json) as $result) {
+    var_dump($result);
+}
+
+```