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/vite-plugin-scanner/index.d.ts

@@ -0,0 +1,10 @@
+import type { Plugin as VitePlugin } from 'vite';
+import type { Logger } from '../core/logger/core.js';
+import type { AstroSettings, RoutesList } from '../types/astro.js';
+interface AstroPluginScannerOptions {
+    settings: AstroSettings;
+    logger: Logger;
+    routesList: RoutesList;
+}
+export default function astroScannerPlugin({ settings, logger, routesList, }: AstroPluginScannerOptions): VitePlugin;
+export {};