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

firestore.rules

@@ -54,13 +54,13 @@ service cloud.firestore {
       allow delete: if isAuthenticated();
     }
     
-    // Mind Maps - карты проектов
+    // Mind Maps - карты проектов (старая структура)
     match /mindmaps/{projectId} {
       allow read: if isAuthenticated();
       allow create: if isAuthenticated();
       allow update: if isAuthenticated();
       allow delete: if isAuthenticated();
-      
+
       match /nodes/{nodeId} {
         allow read: if isAuthenticated();
         allow create: if isAuthenticated();
@@ -68,6 +68,14 @@ service cloud.firestore {
         allow delete: if isAuthenticated();
       }
     }
+
+    // Mind Maps - новая структура с ownerEmail и isMain
+    match /mind_maps/{mindMapId} {
+      allow read: if isAuthenticated();
+      allow create: if isAuthenticated();
+      allow update: if isAuthenticated();
+      allow delete: if isAuthenticated();
+    }
     
     // Events - события календаря
     match /events/{eventId} {