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/prerender/metadata.d.ts

@@ -0,0 +1,8 @@
+import type { ModuleInfo, ModuleLoader } from '../core/module-loader/index.js';
+type GetPrerenderStatusParams = {
+    filePath: URL;
+    loader: ModuleLoader;
+};
+export declare function getPrerenderStatus({ filePath, loader, }: GetPrerenderStatusParams): boolean | undefined;
+export declare function getPrerenderMetadata(moduleInfo: ModuleInfo): any;
+export {};