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/astro/dist/assets/index.d.ts

@@ -0,0 +1,3 @@
+export { getConfiguredImageService, getImage } from './internal.js';
+export { baseService, isLocalService } from './services/service.js';
+export { type LocalImageProps, type RemoteImageProps } from './types.js';