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/property-information/lib/xml.js

@@ -0,0 +1,9 @@
+import {create} from './util/create.js'
+
+export const xml = create({
+  properties: {xmlBase: null, xmlLang: null, xmlSpace: null},
+  space: 'xml',
+  transform(_, property) {
+    return 'xml:' + property.slice(3).toLowerCase()
+  }
+})