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/@tailwindcss/node/dist/esm-cache.loader.d.mts

@@ -0,0 +1,5 @@
+import { ResolveHook } from 'node:module';
+
+declare let resolve: ResolveHook;
+
+export { resolve };