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/@astrojs/prism/dist/index.js

@@ -0,0 +1,4 @@
+import { default as default2 } from "../Prism.astro";
+export {
+  default2 as Prism
+};