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/util/emphasis-strong-marker.d.ts

@@ -0,0 +1,7 @@
+/**
+ * @this {State}
+ * @returns {'*' | '_'}
+ */
+export function emphasisStrongMarker(this: State): "*" | "_";
+import type { State } from '../types.js';
+//# sourceMappingURL=emphasis-strong-marker.d.ts.map