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/scripts.d.ts

@@ -0,0 +1,5 @@
+import type { SSRResult } from '../../types/public/internal.js';
+export declare function determineIfNeedsHydrationScript(result: SSRResult): boolean;
+export declare function determinesIfNeedsDirectiveScript(result: SSRResult, directive: string): boolean;
+export type PrescriptType = 'both' | 'directive';
+export declare function getPrescripts(result: SSRResult, type: PrescriptType, directive: string): string;