feat: Add Nanaxe server with Docker, GitHub Actions CI/CD, and auto-deployment

- Add complete server infrastructure with Gitea, API, PostgreSQL
- Implement Obsidian-compatible markdown mindmap converter
- Add Flutter service for server synchronization
- Configure GitHub Actions for automated build and deploy
- Add production docker-compose with health checks
- Include VPS setup and deployment scripts
- Add comprehensive deployment documentation

pubspec.yaml

@@ -40,6 +40,9 @@ dependencies:
   cupertino_icons: ^1.0.8
   flutter_staggered_grid_view: ^0.7.0
   syncfusion_flutter_gauges: ^25.1.38
+  
+  # Mind Maps
+  reactive_mind_map: ^1.0.3
   graphview: ^1.2.0
   flutter_mind_map: ^1.0.23