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/env/constants.js

@@ -0,0 +1,19 @@
+const CLIENT_VIRTUAL_MODULE_ID = "astro:env/client";
+const RESOLVED_CLIENT_VIRTUAL_MODULE_ID = "\0" + CLIENT_VIRTUAL_MODULE_ID;
+const SERVER_VIRTUAL_MODULE_ID = "astro:env/server";
+const RESOLVED_SERVER_VIRTUAL_MODULE_ID = "\0" + SERVER_VIRTUAL_MODULE_ID;
+const INTERNAL_VIRTUAL_MODULE_ID = "virtual:astro:env/internal";
+const RESOLVED_INTERNAL_VIRTUAL_MODULE_ID = "\0" + INTERNAL_VIRTUAL_MODULE_ID;
+const ENV_TYPES_FILE = "env.d.ts";
+const PKG_BASE = new URL("../../", import.meta.url);
+const MODULE_TEMPLATE_URL = new URL("templates/env.mjs", PKG_BASE);
+export {
+  CLIENT_VIRTUAL_MODULE_ID,
+  ENV_TYPES_FILE,
+  INTERNAL_VIRTUAL_MODULE_ID,
+  MODULE_TEMPLATE_URL,
+  RESOLVED_CLIENT_VIRTUAL_MODULE_ID,
+  RESOLVED_INTERNAL_VIRTUAL_MODULE_ID,
+  RESOLVED_SERVER_VIRTUAL_MODULE_ID,
+  SERVER_VIRTUAL_MODULE_ID
+};