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/client/dev-toolbar/apps/settings.d.ts

@@ -0,0 +1,7 @@
+declare const _default: {
+    id: string;
+    name: string;
+    icon: "gear";
+    init(canvas: ShadowRoot, eventTarget: import("../helpers.js").ToolbarAppEventTarget): void;
+};
+export default _default;