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/core/shiki.js

@@ -0,0 +1,16 @@
+import {
+  createShikiHighlighter
+} from "@astrojs/markdown-remark";
+const cachedHighlighters = /* @__PURE__ */ new Map();
+function getCachedHighlighter(opts) {
+  const key = JSON.stringify(opts, Object.keys(opts).sort());
+  if (cachedHighlighters.has(key)) {
+    return cachedHighlighters.get(key);
+  }
+  const highlighter = createShikiHighlighter(opts);
+  cachedHighlighters.set(key, highlighter);
+  return highlighter;
+}
+export {
+  getCachedHighlighter
+};