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

infrastructure/backend.prod.env.example

@@ -14,6 +14,11 @@ JWT_REFRESH_EXPIRES_IN=30d
 # Must match DOMAIN in .env — used for CORS, invite links, cookies
 FRONTEND_URL=https://nudentic.ir
 
+# AdminJS at https://nudentic.ir/admin (nginx proxies /admin to the API).
+# Change these — the code defaults are only for local development.
+ADMINJS_EMAIL=admin@nudentic.ir
+ADMINJS_PASSWORD=CHANGE_ME_STRONG_ADMINJS_PASSWORD
+
 # Required for HTTPS — browsers reject Secure cookies over plain HTTP
 COOKIE_SECURE=true