list everything left open for the demo that must be closed before real users

docs/security-before-production.md records, item by item, what is exposed
on purpose while this is an internship demo: the committed token-signing key
still in use on the server, seven fixed-code demo logins, demo users in the
production database, a public /api/health that reports internal state, a
public API schema, a public leaderboard with children's names, /admin on the
public domain, the server answering on port 80 around ArvanCloud, per-worker
rate limits without Redis, guest login by deviceId alone, unhashed refresh
tokens and OTP codes, AI cost exposure through throwaway guests, hearts not
enforced, SQLite without off-box backups, and shared root access to the box.
Each has its risk, why it was left, the fix and how to verify it; the
exposure checks were run against the live server on 2026-09-25.

CLAUDE.md, README and docs/operations.md point to it so no agent mistakes
this deployment for production-ready.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

README.md

@@ -119,6 +119,7 @@ curl https://api.math.tadrisino2.ir/api/health
 | سند | موضوع |
 |---|---|
 | [`docs/operations.md`](docs/operations.md) | دیپلوی، متغیرهای محیطی، سلامت، بکاپ، ورودِ توسعه‌دهنده‌ها |
+| [`docs/security-before-production.md`](docs/security-before-production.md) | **پیش از کاربرِ واقعی:** هرچه برای دمو عمداً باز مانده، خطرش و راهِ بستنش |
 | [`docs/content-authoring.md`](docs/content-authoring.md) | افزودن و ویرایشِ محتوا از پنلِ ادمین، ساختِ انبوهِ سوال |
 | [`docs/architecture.md`](docs/architecture.md) | تصمیم‌های معماری و دلیلشان |
 | [`docs/frontend/README.md`](docs/frontend/README.md) | راهنمای اتصالِ فرانت‌اند + کلاینتِ تایپ‌دار |