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/actions/runtime/client.js

@@ -0,0 +1,11 @@
+export * from "./shared.js";
+function defineAction() {
+  throw new Error("[astro:action] `defineAction()` unexpectedly used on the client.");
+}
+function getActionContext() {
+  throw new Error("[astro:action] `getActionContext()` unexpectedly used on the client.");
+}
+export {
+  defineAction,
+  getActionContext
+};