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/transitions/router.d.ts

@@ -0,0 +1,9 @@
+import type { Fallback, Options } from './types.js';
+export declare const updateScrollPosition: (positions: {
+    scrollX: number;
+    scrollY: number;
+}) => void;
+export declare const supportsViewTransitions: boolean;
+export declare const transitionEnabledOnThisPage: () => boolean;
+export declare function getFallback(): Fallback;
+export declare function navigate(href: string, options?: Options): Promise<void>;