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/virtual-modules/container.d.ts

@@ -0,0 +1,17 @@
+import type { AstroRenderer } from '../types/public/integrations.js';
+import type { SSRLoadedRenderer } from '../types/public/internal.js';
+/**
+ * Use this function to provide renderers to the `AstroContainer`:
+ *
+ * ```js
+ * import { getContainerRenderer } from "@astrojs/react";
+ * import { experimental_AstroContainer as AstroContainer } from "astro/container";
+ * import { loadRenderers } from "astro:container"; // use this only when using vite/vitest
+ *
+ * const renderers = await loadRenderers([ getContainerRenderer ]);
+ * const container = await AstroContainer.create({ renderers });
+ *
+ * ```
+ * @param renderers
+ */
+export declare function loadRenderers(renderers: AstroRenderer[]): Promise<SSRLoadedRenderer[]>;