Expose AdminJS on nudentic.ir: nginx only proxied /api, so /admin never reached Nest.

infrastructure/backend.staging.env.example

@@ -12,6 +12,10 @@ JWT_REFRESH_EXPIRES_IN=30d
 # CORS, cookies, and invite links — must match how users open the app
 FRONTEND_URL=https://wixur.ir
 
+# AdminJS at https://wixur.ir/admin (nginx proxies /admin to the API).
+ADMINJS_EMAIL=admin@wixur.ir
+ADMINJS_PASSWORD=CHANGE_ME_STRONG_ADMINJS_PASSWORD
+
 # TLS is terminated on Windows nginx :443 — cookies must be Secure
 COOKIE_SECURE=true