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/runtime/server/render/script.d.ts

@@ -0,0 +1,10 @@
+import type { SSRResult } from '../../../types/public/internal.js';
+/**
+ * Relies on the `renderScript: true` compiler option
+ * @experimental
+ */
+export declare function renderScript(result: SSRResult, id: string): Promise<{
+    type: "script";
+    id: string;
+    content: string;
+}>;