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/crossws/dist/adapters/sse.d.mts

@@ -0,0 +1,13 @@
+import { Adapter, AdapterInstance, AdapterOptions } from '../index.mjs';
+import '../shared/crossws.BQXMA5bH.mjs';
+
+interface SSEAdapter extends AdapterInstance {
+    fetch(req: Request): Promise<Response>;
+}
+interface SSEOptions extends AdapterOptions {
+    bidir?: boolean;
+}
+declare const sseAdapter: Adapter<SSEAdapter, SSEOptions>;
+
+export { sseAdapter as default };
+export type { SSEAdapter, SSEOptions };