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/components/index.ts

@@ -0,0 +1,6 @@
+// The `ts-ignore` comments here are necessary because we're importing this file inside the `astro:components`
+// virtual module's types, which means that `tsc` will try to resolve these imports.
+// @ts-ignore
+export { default as Code } from './Code.astro';
+// @ts-ignore
+export { default as Debug } from './Debug.astro';