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/utils.d.ts

@@ -0,0 +1,11 @@
+import type { AstroSettings } from '../types/astro.js';
+import type { AstroConfig } from '../types/public/config.js';
+export declare function getPrerenderDefault(config: AstroConfig): boolean;
+/**
+ * Returns the correct output directory of the SSR build based on the configuration
+ */
+export declare function getServerOutputDirectory(settings: AstroSettings): URL;
+/**
+ * Returns the correct output directory of the client build based on the configuration
+ */
+export declare function getClientOutputDirectory(settings: AstroSettings): URL;