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/prerender/utils.js

@@ -0,0 +1,15 @@
+import { getOutDirWithinCwd } from "../core/build/common.js";
+function getPrerenderDefault(config) {
+  return config.output !== "server";
+}
+function getServerOutputDirectory(settings) {
+  return settings.buildOutput === "server" ? settings.config.build.server : getOutDirWithinCwd(settings.config.outDir);
+}
+function getClientOutputDirectory(settings) {
+  return settings.buildOutput === "server" ? settings.config.build.client : settings.config.outDir;
+}
+export {
+  getClientOutputDirectory,
+  getPrerenderDefault,
+  getServerOutputDirectory
+};