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/astro/dist/vite-plugin-astro-server/util.js

@@ -0,0 +1,8 @@
+import { isCSSRequest } from "vite";
+const rawRE = /(?:\?|&)raw(?:&|$)/;
+const inlineRE = /(?:\?|&)inline\b/;
+const isBuildableCSSRequest = (request) => isCSSRequest(request) && !rawRE.test(request) && !inlineRE.test(request);
+export {
+  isBuildableCSSRequest,
+  isCSSRequest
+};