Refactor: Initial code split into includes directory for modularity

- Reorganized backend logic by moving API, authentication, Docker, status, and WebSocket handling into separate modules (api.js, auth.js, docker.js, status.js, websocket.js) within ./includes/
- Converted codebase to ES modules with import/export syntax for modern JavaScript
- Updated index.js to serve as main entry point, importing from ./includes/
- Reduced code duplication and improved readability with modularized functions
- Ensured full functionality preservation, including Docker stats and WebSocket communication
- Updated README to reflect new folder structure and ES module setup

package.json

@@ -3,6 +3,7 @@
   "version": "1.0.0",
   "description": "Web panel for My-MC API with Docker integration",
   "main": "server.js",
+  "type": "module",
   "scripts": {
     "start": "node server.js",
     "build:css": "postcss public/css/styles.css -o public/css/styles.min.css",