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/i18n/vite-plugin-i18n.d.ts

@@ -0,0 +1,12 @@
+import type * as vite from 'vite';
+import type { AstroSettings } from '../types/astro.js';
+import type { AstroConfig } from '../types/public/config.js';
+type AstroInternationalization = {
+    settings: AstroSettings;
+};
+export interface I18nInternalConfig extends Pick<AstroConfig, 'base' | 'site' | 'trailingSlash'>, Pick<AstroConfig['build'], 'format'> {
+    i18n: AstroConfig['i18n'];
+    isBuild: boolean;
+}
+export default function astroInternationalization({ settings, }: AstroInternationalization): vite.Plugin;
+export {};