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/@shikijs/engine-javascript/dist/index.d.mts

@@ -0,0 +1,5 @@
+export { J as JavaScriptRegexEngineOptions, a as JavaScriptRegexScannerOptions, b as JavaScriptScanner, c as createJavaScriptRegexEngine, d as defaultJavaScriptRegexConstructor } from './shared/engine-javascript.CDEDnU-m.mjs';
+export { createJavaScriptRawEngine } from './engine-raw.mjs';
+import '@shikijs/types';
+import 'oniguruma-to-es';
+import '@shikijs/vscode-textmate';