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/index.mjs

@@ -0,0 +1,6 @@
+export { COMMANDS, constructCommand, resolveCommand } from './commands.mjs';
+export { AGENTS, INSTALL_METADATA, INSTALL_PAGE, LOCKS } from './constants.mjs';
+export { detect, getUserAgent } from './detect.mjs';
+import 'node:fs/promises';
+import 'node:path';
+import 'node:process';