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/package-manager-detector/dist/constants.d.mts

@@ -0,0 +1,8 @@
+import { A as Agent, a as AgentName } from './shared/package-manager-detector.DksAilYA.mjs';
+
+declare const AGENTS: Agent[];
+declare const LOCKS: Record<string, AgentName>;
+declare const INSTALL_METADATA: Record<string, AgentName>;
+declare const INSTALL_PAGE: Record<Agent, string>;
+
+export { AGENTS, INSTALL_METADATA, INSTALL_PAGE, LOCKS };