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/cli/infra/passthrough-text-styler.d.ts

@@ -0,0 +1,9 @@
+import type { TextStyler } from '../definitions.js';
+export declare class PassthroughTextStyler implements TextStyler {
+    bgWhite(msg: string): string;
+    black(msg: string): string;
+    dim(msg: string): string;
+    green(msg: string): string;
+    bold(msg: string): string;
+    bgGreen(msg: string): string;
+}