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/css.d.ts

@@ -0,0 +1,13 @@
+import type { ModuleLoader } from '../core/module-loader/index.js';
+interface ImportedStyle {
+    id: string;
+    url: string;
+    content: string;
+}
+/** Given a filePath URL, crawl Vite’s module graph to find all style imports. */
+export declare function getStylesForURL(filePath: URL, loader: ModuleLoader): Promise<{
+    urls: Set<string>;
+    styles: ImportedStyle[];
+    crawledFiles: Set<string>;
+}>;
+export {};