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/visible.prebuilt.d.ts

@@ -0,0 +1,7 @@
+/**
+ * This file is prebuilt from packages/astro/src/runtime/client/visible.ts
+ * Do not edit this directly, but instead edit that file and rerun the prebuild
+ * to generate this file.
+ */
+declare const _default: "(()=>{var a=(s,i,o)=>{let r=async()=>{await(await s())()},t=typeof i.value==\"object\"?i.value:void 0,c={rootMargin:t==null?void 0:t.rootMargin},n=new IntersectionObserver(e=>{for(let l of e)if(l.isIntersecting){n.disconnect(),r();break}},c);for(let e of o.children)n.observe(e)};(self.Astro||(self.Astro={})).visible=a;window.dispatchEvent(new Event(\"astro:visible\"));})();";
+export default _default;