fix(version): BUG-047 la version suit chaque livraison (source unique VERSION + bump SemVer automatique)

VERSION (racine) devient la source unique de verite MAJEUR.MINEUR.CORRECTIF, incrementee a chaque commit par le hook prepare-commit-msg (BREAKING -> majeur, feat -> mineur, sinon correctif) ; post-commit rattache les fichiers derives au commit et cree le tag vX.Y.Z, publie au push (push.followTags). Tous les derives sont resynchronises : package.json, desktop Tauri, README.md/README.fr.md, docs/ROADMAP.md, CHANGELOG.md. Backend, image Docker et desktop lisent le meme fichier (plus de numero code en dur). Outils : scripts/bump_version.py, scripts/install-hooks.sh. Tests : tests/test_version.py (46, garde-fou de coherence globale).

README.md

@@ -2,7 +2,7 @@
 
 **Ultra-light web gateway for your Obsidian vaults** — Access, browse, and search all your Obsidian notes from any device via a modern, responsive web interface.
 
-[![Version](https://img.shields.io/badge/Version-1.7.0-blue.svg)]()
+[![Version](https://img.shields.io/badge/Version-2.3.0-blue.svg)]()
 [![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)
 [![Docker](https://img.shields.io/badge/Docker-Ready-blue.svg)](https://www.docker.com/)
 [![Python](https://img.shields.io/badge/Python-3.11+-green.svg)](https://www.python.org/)
@@ -1085,8 +1085,8 @@ This project is licensed under the **MIT License** - see the [LICENSE](LICENSE)
 
 ## 📝 Changelog
 
-See [CHANGELOG.md](./CHANGELOG.md) for the complete version history (v1.0.0 → v1.7.0).
+See [CHANGELOG.md](./CHANGELOG.md) for the complete version history (v1.0.0 → v2.3.0).
 
 ---
 
-*Project: ObsiGate | Version: 1.7.0 | Last updated: May 2026*
+*Project: ObsiGate | Version: 2.3.0 | Last updated: May 2026*