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/core/viteUtils.d.ts

@@ -0,0 +1,15 @@
+import type { ModuleLoader } from './module-loader/index.js';
+/**
+ * Re-implementation of Vite's normalizePath that can be used without Vite
+ */
+export declare function normalizePath(id: string): string;
+/**
+ * Resolve the hydration paths so that it can be imported in the client
+ */
+export declare function resolvePath(specifier: string, importer: string): string;
+export declare function rootRelativePath(root: URL, idOrUrl: URL | string, shouldPrependForwardSlash?: boolean): string;
+/**
+ * Simulate Vite's resolve and import analysis so we can import the id as an URL
+ * through a script tag or a dynamic import as-is.
+ */
+export declare function resolveIdToUrl(loader: ModuleLoader, id: string, root?: URL): Promise<string>;