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/replace/Atrule.js

@@ -0,0 +1,9 @@
+import { keyword as resolveKeyword } from 'css-tree';
+import compressKeyframes from './atrule/keyframes.js';
+
+export default function(node) {
+    // compress @keyframe selectors
+    if (resolveKeyword(node.name).basename === 'keyframes') {
+        compressKeyframes(node);
+    }
+};