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/mdast-util-to-markdown/lib/handle/text.js

@@ -0,0 +1,15 @@
+/**
+ * @import {Info, State} from 'mdast-util-to-markdown'
+ * @import {Parents, Text} from 'mdast'
+ */
+
+/**
+ * @param {Text} node
+ * @param {Parents | undefined} _
+ * @param {State} state
+ * @param {Info} info
+ * @returns {string}
+ */
+export function text(node, _, state, info) {
+  return state.safe(node.value, info)
+}