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/mdast-util-to-markdown/lib/unsafe.d.ts

@@ -0,0 +1,4 @@
+/** @type {Array<Unsafe>} */
+export const unsafe: Array<Unsafe>;
+import type { Unsafe } from 'mdast-util-to-markdown';
+//# sourceMappingURL=unsafe.d.ts.map