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/phar-io/version/composer.json

@@ -0,0 +1,34 @@
+{
+  "name": "phar-io/version",
+  "description": "Library for handling version information and constraints",
+  "license": "BSD-3-Clause",
+  "authors": [
+    {
+      "name": "Arne Blankerts",
+      "email": "arne@blankerts.de",
+      "role": "Developer"
+    },
+    {
+      "name": "Sebastian Heuer",
+      "email": "sebastian@phpeople.de",
+      "role": "Developer"
+    },
+    {
+      "name": "Sebastian Bergmann",
+      "email": "sebastian@phpunit.de",
+      "role": "Developer"
+    }
+  ],
+  "support": {
+    "issues": "https://github.com/phar-io/version/issues"
+  },
+  "require": {
+    "php": "^7.2 || ^8.0"
+  },
+  "autoload": {
+    "classmap": [
+      "src/"
+    ]
+  }
+}
+