feat(ai): ajouter une section de la reponse et supporter l'editeur Forge (BUG-057, #102)

L'assistant IA peut desormais inserer sa reponse dans l'editeur Forge (postMessage parent-insert) en plus d'Editer, et chaque bloc de code propose un bouton « Ajouter la section » pour n'inserer que ce bloc.

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-2.8.4-blue.svg)]()
+[![Version](https://img.shields.io/badge/Version-2.9.0-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 → v2.8.4).
+See [CHANGELOG.md](./CHANGELOG.md) for the complete version history (v1.0.0 → v2.9.0).
 
 ---
 
-*Project: ObsiGate | Version: 2.8.4 | Last updated: May 2026*
+*Project: ObsiGate | Version: 2.9.0 | Last updated: May 2026*