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/unist-util-remove-position/index.d.ts

@@ -0,0 +1,2 @@
+export {removePosition} from './lib/index.js'
+export type Options = import('./lib/index.js').Options