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/jawira/plantuml-encoding/composer.json

@@ -0,0 +1,35 @@
+{
+  "name": "jawira/plantuml-encoding",
+  "description": "PlantUML encoding functions",
+  "license": "MIT",
+  "type": "library",
+  "keywords": [
+    "PlantUML",
+    "functions",
+    "encoding",
+    "encodep",
+    "uml"
+  ],
+  "authors": [
+    {
+      "name": "Jawira Portugal",
+      "homepage": "https://jawira.com"
+    }
+  ],
+  "require": {
+    "php": ">=7.4",
+    "ext-zlib": "*"
+  },
+  "require-dev": {
+    "phpstan/phpstan": "^2"
+  },
+  "autoload": {
+    "files": [
+      "src/plantuml_functions.php"
+    ]
+  },
+  "config": {
+    "preferred-install": "dist",
+    "sort-packages": true
+  }
+}