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/runtime/server/transition.d.ts

@@ -0,0 +1,8 @@
+import type { SSRResult } from '../../types/public/internal.js';
+import type { TransitionAnimationPair, TransitionAnimationValue } from '../../types/public/view-transitions.js';
+export declare function createTransitionScope(result: SSRResult, hash: string): string;
+export declare function renderTransition(result: SSRResult, hash: string, animationName: TransitionAnimationValue | undefined, transitionName: string): string;
+export declare function createAnimationScope(transitionName: string, animations: Record<string, TransitionAnimationPair>): {
+    scope: string;
+    styles: string;
+};