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/clsx/clsx.d.mts

@@ -0,0 +1,6 @@
+export type ClassValue = ClassArray | ClassDictionary | string | number | bigint | null | boolean | undefined;
+export type ClassDictionary = Record<string, any>;
+export type ClassArray = ClassValue[];
+
+export function clsx(...inputs: ClassValue[]): string;
+export default clsx;