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/index.d.ts

@@ -0,0 +1,8 @@
+import type { TransitionDirectionalAnimations } from '../types/public/view-transitions.js';
+export { createAnimationScope } from '../runtime/server/transition.js';
+export declare function slide({ duration, }?: {
+    duration?: string | number;
+}): TransitionDirectionalAnimations;
+export declare function fade({ duration, }?: {
+    duration?: string | number;
+}): TransitionDirectionalAnimations;