feat(docs): add detailed features and business flow diagrams

- Introduced new interaction and community features, including comments and private messaging.
- Added technical diagrams for critical workflows: authentication, content publication, and messaging.
- Enhanced data model documentation with support for comments and messaging tables.
- Updated API references with endpoints for comments, messaging, and user search.
- Integrated post-quantum cryptography for improved data protection.

documentation/content/docs/_meta.json

@@ -7,6 +7,7 @@
 	"features": "Fonctionnalités",
 	"stack": "Stack Technologique",
 	"database": "Modèle de Données",
+	"flows": "Flux Métiers",
 	"---security---": {
 		"type": "separator",
 		"label": "Sécurité & Conformité"