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/mdast-util-phrasing/lib/index.d.ts

@@ -0,0 +1,3 @@
+export function phrasing(node?: unknown): node is import("mdast").Break | import("mdast").Delete | import("mdast").Emphasis | import("mdast").FootnoteReference | import("mdast").Image | import("mdast").ImageReference | import("mdast").InlineCode | import("mdast").Link | import("mdast").LinkReference | import("mdast").Strong | import("mdast").Text;
+export type Html = import('mdast').Html;
+export type PhrasingContent = import('mdast').PhrasingContent;