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/core/index.js

@@ -0,0 +1,11 @@
+import { default as _sync } from "./sync/index.js";
+import { default as default2 } from "./build/index.js";
+import { default as default3 } from "./dev/index.js";
+import { default as default4 } from "./preview/index.js";
+const sync = (inlineConfig) => _sync(inlineConfig);
+export {
+  default2 as build,
+  default3 as dev,
+  default4 as preview,
+  sync
+};