fix: comprehensive repo audit — 15 issues fixed

feat: Sprint 4 — indexed search + job rate limiting

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

perf: Sprint 2a — caching, parallel pipeline, async I/O, tests

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

feat(pipeline): IIIF-native Sprint 3 — in-memory image fetch for AI analysis

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

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

fix(paths): analyse systémique et correction exhaustive des chemins en production

feat(sprint4-session-c): branchement pipeline réel sur les jobs + tests job_runner