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/@astrojs/markdown-remark/dist/load-plugins.js

@@ -0,0 +1,22 @@
+import { importPlugin as _importPlugin } from "#import-plugin";
+async function importPlugin(p) {
+  if (typeof p === "string") {
+    return await _importPlugin(p);
+  } else {
+    return p;
+  }
+}
+function loadPlugins(items) {
+  return items.map((p) => {
+    return new Promise((resolve, reject) => {
+      if (Array.isArray(p)) {
+        const [plugin, opts] = p;
+        return importPlugin(plugin).then((m) => resolve([m, opts])).catch((e) => reject(e));
+      }
+      return importPlugin(p).then((m) => resolve([m])).catch((e) => reject(e));
+    });
+  });
+}
+export {
+  loadPlugins
+};