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/bail/index.d.ts

@@ -0,0 +1,10 @@
+/**
+ * Throw a given error.
+ *
+ * @param {Error|null|undefined} [error]
+ *   Maybe error.
+ * @returns {asserts error is null|undefined}
+ */
+export function bail(
+  error?: Error | null | undefined
+): asserts error is null | undefined