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/ui-library/icon.d.ts

@@ -0,0 +1,10 @@
+import { type Icon } from './icons.js';
+export declare class DevToolbarIcon extends HTMLElement {
+    _icon: Icon | undefined;
+    shadowRoot: ShadowRoot;
+    get icon(): Icon | undefined;
+    set icon(name: Icon | undefined);
+    constructor();
+    getIconHTML(icon: Icon | undefined): string;
+    buildTemplate(): void;
+}