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/assets/fonts/infra/system-fallbacks-provider.d.ts

@@ -0,0 +1,6 @@
+import type { SystemFallbacksProvider } from '../definitions.js';
+import type { FontFaceMetrics, GenericFallbackName } from '../types.js';
+export declare class RealSystemFallbacksProvider implements SystemFallbacksProvider {
+    getLocalFonts(fallback: GenericFallbackName): Array<string> | null;
+    getMetricsForLocalFont(family: string): FontFaceMetrics;
+}