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/xlink.js

@@ -0,0 +1,17 @@
+import {create} from './util/create.js'
+
+export const xlink = create({
+  properties: {
+    xLinkActuate: null,
+    xLinkArcRole: null,
+    xLinkHref: null,
+    xLinkRole: null,
+    xLinkShow: null,
+    xLinkTitle: null,
+    xLinkType: null
+  },
+  space: 'xlink',
+  transform(_, property) {
+    return 'xlink:' + property.slice(5).toLowerCase()
+  }
+})