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/micromark/dev/lib/postprocess.js

@@ -0,0 +1,19 @@
+/**
+ * @import {Event} from 'micromark-util-types'
+ */
+
+import {subtokenize} from 'micromark-util-subtokenize'
+
+/**
+ * @param {Array<Event>} events
+ *   Events.
+ * @returns {Array<Event>}
+ *   Events.
+ */
+export function postprocess(events) {
+  while (!subtokenize(events)) {
+    // Empty
+  }
+
+  return events
+}