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.ts

@@ -0,0 +1,10 @@
+declare namespace clsx {
+	type ClassValue = ClassArray | ClassDictionary | string | number | bigint | null | boolean | undefined;
+	type ClassDictionary = Record<string, any>;
+	type ClassArray = ClassValue[];
+	function clsx(...inputs: ClassValue[]): string;
+}
+
+declare function clsx(...inputs: clsx.ClassValue[]): string;
+
+export = clsx;