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/vite-plugin-astro-server/request.d.ts

@@ -0,0 +1,14 @@
+import type http from 'node:http';
+import type { RoutesList } from '../types/astro.js';
+import type { DevServerController } from './controller.js';
+import type { DevPipeline } from './pipeline.js';
+type HandleRequest = {
+    pipeline: DevPipeline;
+    routesList: RoutesList;
+    controller: DevServerController;
+    incomingRequest: http.IncomingMessage;
+    incomingResponse: http.ServerResponse;
+};
+/** The main logic to route dev server requests to pages in Astro. */
+export declare function handleRequest({ pipeline, routesList, controller, incomingRequest, incomingResponse, }: HandleRequest): Promise<void>;
+export {};