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/deterministic-object-hash/dist/index.d.ts

@@ -0,0 +1,5 @@
+/// <reference types="node" />
+import { BinaryToTextEncoding, webcrypto } from "node:crypto";
+/** Creates a deterministic hash for all inputs. */
+export default function deterministicHash(input: unknown, algorithm?: Parameters<typeof webcrypto.subtle.digest>[0], output?: BinaryToTextEncoding): Promise<string>;
+export declare function deterministicString(input: unknown): string;