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/runtime/client/only.prebuilt.js

@@ -0,0 +1,4 @@
+var only_prebuilt_default = `(()=>{var e=async t=>{await(await t())()};(self.Astro||(self.Astro={})).only=e;window.dispatchEvent(new Event("astro:only"));})();`;
+export {
+  only_prebuilt_default as default
+};