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/events/toolbar.d.ts

@@ -0,0 +1,10 @@
+interface AppToggledEventPayload {
+    app: string;
+}
+export declare function eventAppToggled(options: {
+    appName: 'other' | (string & {});
+}): {
+    eventName: string;
+    payload: AppToggledEventPayload;
+}[];
+export {};