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/assets/endpoint/shared.d.ts

@@ -0,0 +1,5 @@
+export declare function loadRemoteImage(src: URL): Promise<Buffer | undefined>;
+export declare const handleImageRequest: ({ request, loadLocalImage, }: {
+    request: Request;
+    loadLocalImage: (src: string, baseUrl: URL) => Promise<Buffer | undefined>;
+}) => Promise<Response>;