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/remark-smartypants/dist/plugin.d.ts

@@ -0,0 +1,7 @@
+import { type Options } from "retext-smartypants";
+import type { Plugin } from "unified";
+/**
+ * remark plugin to implement SmartyPants.
+ */
+declare const remarkSmartypants: Plugin<[Options?]>;
+export default remarkSmartypants;