refactor: Move Astro to root, use PORT env (default 80), allow all hosts

- Move Astro files from dealplustech-astro/ to project root
- Update Dockerfile: PORT environment variable (default 80)
- Add vite.config.ts with allowedHosts: true
- Matches nixpacks behavior for Easypanel deployment
- No hardcoded ports or domains

node_modules/@shikijs/engine-javascript/README.md

@@ -0,0 +1,9 @@
+# @shikijs/engine-javascript
+
+Engine for Shiki using JavaScript's native RegExp. Uses [Oniguruma-To-ES](https://github.com/slevithan/oniguruma-to-es) to transpile regex syntax and behavior.
+
+[Documentation](https://shiki.style/guide/regex-engines)
+
+## License
+
+MIT