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Corrige l'incoherence d'affichage (page principale 0.0.0-dev vs a propos v2.0.0-dev) et unifie la gestion de version sur une seule source de verite. Backend: - version.py: get_version() retourne toujours le tag x.y.z propre du dernier tag (plus de 0.0.0-dev / -N-gHASH dans l'UI). Ajout get_git_describe() et get_git_commit() pour le detail. - main.py: /api/health expose git_describe + git_commit (nouveaux champs). Frontend: - modale A propos (populateAbout): version + commit lus depuis /api/health, suppression du hardcode v2.0.0-dev dans index.html. - section config A propos (loadAbout): lit health.version, plus de state. APP_VERSION obsolete. - badge header: fetch /api/health (fallback neutre '...'). - state.js: suppression de APP_VERSION (1.5.0) devenu mort; imports nettoyes. Script: - scripts/bump_version.sh: incrementation SemVer selon les commits (breaking->major, feat->minor, sinon patch), creer/pousser le tag vX.Y.Z. Tests: 507 passed, frontend validators OK.