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/csso/lib/clean/utils.js

@@ -0,0 +1,7 @@
+export function hasNoChildren(node) {
+    return !node || !node.children || node.children.isEmpty;
+}
+
+export function isNodeChildrenList(node, list) {
+    return node !== null && node.children === list;
+}