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/virtual-modules/container.js

@@ -0,0 +1,18 @@
+async function loadRenderers(renderers) {
+  const loadedRenderers = await Promise.all(
+    renderers.map(async (renderer) => {
+      const mod = await import(renderer.serverEntrypoint.toString());
+      if (typeof mod.default !== "undefined") {
+        return {
+          ...renderer,
+          ssr: mod.default
+        };
+      }
+      return void 0;
+    })
+  );
+  return loadedRenderers.filter((r) => Boolean(r));
+}
+export {
+  loadRenderers
+};