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/actions/runtime/virtual.d.ts

@@ -0,0 +1,4 @@
+import type { ActionClient } from './server.js';
+export * from 'virtual:astro:actions/runtime';
+export declare function getActionPath(action: ActionClient<any, any, any>): string;
+export declare const actions: Record<string | symbol, any>;