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/unstorage/drivers/overlay.d.mts

@@ -0,0 +1,6 @@
+import type { Driver } from "..";
+export interface OverlayStorageOptions {
+    layers: Driver[];
+}
+declare const _default: (opts: OverlayStorageOptions) => Driver<OverlayStorageOptions, never>;
+export default _default;