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/media.prebuilt.js

@@ -0,0 +1,4 @@
+var media_prebuilt_default = `(()=>{var n=(a,t)=>{let i=async()=>{await(await a())()};if(t.value){let e=matchMedia(t.value);e.matches?i():e.addEventListener("change",i,{once:!0})}};(self.Astro||(self.Astro={})).media=n;window.dispatchEvent(new Event("astro:media"));})();`;
+export {
+  media_prebuilt_default as default
+};