fix: comprehensive repo audit — 15 issues fixed

feat: Sprint 4 — indexed search + job rate limiting

fix: Sprint 3a — updated_at onupdate, RetroMenuBar unique keys

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

fix: IIIF image fetch performance — retry with backoff, request size reduction, cursor warning

feat(schemas): IIIF-native Sprint 1 — schema evolution for streaming architecture

fix(backend): Sprint Fix 2 — data integrity, error handling, robustness

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

feat(sprint4-session-b): endpoints jobs, ingestion et modèles IA

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

Sprint 1 — Setup initial : arborescence, schémas Pydantic, profils JSON, prompts, tests