fix: comprehensive repo audit — 15 issues fixed

refactor: Sprint 3b — remove dead code, non-functional provider, unused fields

fix(security+infra): Sprint Fix 1 — path traversal, docker-compose, CORS

rename: Scriptorium AI → IIIF Studio across entire codebase

fix(sprint-f0): fondations — lazy imports, schémas conformes, pydantic-settings

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

fix(profiles): resolve __file__ to absolute path before parent traversal

feat(sprint4-session-a): API FastAPI — structure de base + endpoints lecture et export