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/prismjs/components/prism-cilkcpp.js

@@ -0,0 +1,9 @@
+Prism.languages.cilkcpp = Prism.languages.insertBefore('cpp', 'function', {
+	'parallel-keyword': {
+		pattern: /\bcilk_(?:for|reducer|s(?:cope|pawn|ync))\b/,
+		alias: 'keyword'
+	}
+});
+
+Prism.languages['cilk-cpp'] = Prism.languages['cilkcpp'];
+Prism.languages['cilk'] = Prism.languages['cilkcpp'];