feat: Sprint 7 — integration test, export limit, French accents

refactor: use API-reported supports_vision instead of hardcoded model names

feat(frontend): Sprint Fix 4 — React Router, accessibility, translations

fix(frontend): Sprint Fix 3 — type safety, memory leaks, error handling

fix(frontend): fix broken navigation, buttons, and layout issues

feat(frontend): Sprint R5 — retro Admin panel

fix(api): guard catch-all against /api/* paths in production + refactor Admin UI

feat: multi-provider dynamique — ajout Mistral/Pixtral, détection auto des providers

feat: supprimer la saisie de clé API dans l'UI — les clés viennent des secrets HF

feat(frontend): interface d'administration — Sprint 6 Session A