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/runtime/client/visible.js

@@ -0,0 +1,25 @@
+const visibleDirective = (load, options, el) => {
+  const cb = async () => {
+    const hydrate = await load();
+    await hydrate();
+  };
+  const rawOptions = typeof options.value === "object" ? options.value : void 0;
+  const ioOptions = {
+    rootMargin: rawOptions?.rootMargin
+  };
+  const io = new IntersectionObserver((entries) => {
+    for (const entry of entries) {
+      if (!entry.isIntersecting) continue;
+      io.disconnect();
+      cb();
+      break;
+    }
+  }, ioOptions);
+  for (const child of el.children) {
+    io.observe(child);
+  }
+};
+var visible_default = visibleDirective;
+export {
+  visible_default as default
+};