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-csv.js

@@ -0,0 +1,6 @@
+// https://tools.ietf.org/html/rfc4180
+
+Prism.languages.csv = {
+	'value': /[^\r\n,"]+|"(?:[^"]|"")*"(?!")/,
+	'punctuation': /,/
+};