feat(admin): manual quiz back-office + rewrite README
Back-office (roadmap V1 step 7):
- server: token-protected HTTP API under /api/admin (ADMIN_TOKEN), Drizzle-backed
CRUD for manual questions — list, create (mcq/truefalse/free, category upsert,
dedup on prompt, validation), delete; 401/503 when unauthorized/unconfigured
- client: /admin page with token login + TanStack Query (list/create/delete),
format-aware form (QCM / vrai-faux / réponse libre)
- env: ADMIN_TOKEN
README: replace the shadcn template with a real NerdWare overview (stack,
structure, getting started, scripts, game modes, back-office).
Verified against real Postgres: auth (401), create (201), dedup (409),
validation (400), list, delete (200/404).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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