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

lib/models/project_model.dart

@@ -34,24 +34,33 @@ class ProjectModel {
   });
 
   factory ProjectModel.fromFirestore(DocumentSnapshot doc) {
-    final data = doc.data() as Map<String, dynamic>;
+    final data = doc.data();
+    if (data == null) {
+      throw Exception('Document data is null');
+    }
+
+    final mapData = data is Map<String, dynamic>
+        ? data
+        : (data as Map<dynamic, dynamic>)
+            .map((k, v) => MapEntry(k.toString(), v));
+
     return ProjectModel(
       id: doc.id,
-      name: data['name'] ?? '',
-      description: data['description'] ?? '',
-      teamId: data['teamId'] ?? '',
-      ownerId: data['ownerId'] ?? '',
-      memberIds: List<String>.from(data['memberIds'] ?? []),
-      status: data['status'] ?? 'active',
-      startDate: (data['startDate'] as Timestamp).toDate(),
-      endDate: data['endDate'] != null 
-          ? (data['endDate'] as Timestamp).toDate() 
+      name: mapData['name'] ?? '',
+      description: mapData['description'] ?? '',
+      teamId: mapData['teamId'] ?? '',
+      ownerId: mapData['ownerId'] ?? '',
+      memberIds: List<String>.from(mapData['memberIds'] ?? []),
+      status: mapData['status'] ?? 'active',
+      startDate: (mapData['startDate'] as Timestamp).toDate(),
+      endDate: mapData['endDate'] != null
+          ? (mapData['endDate'] as Timestamp).toDate()
           : null,
-      color: data['color'] ?? '#1976D2',
-      icon: data['icon'] ?? 'project',
-      settings: data['settings'] ?? {},
-      createdAt: (data['createdAt'] as Timestamp).toDate(),
-      updatedAt: (data['updatedAt'] as Timestamp).toDate(),
+      color: mapData['color'] ?? '#1976D2',
+      icon: mapData['icon'] ?? 'project',
+      settings: mapData['settings'] ?? {},
+      createdAt: (mapData['createdAt'] as Timestamp).toDate(),
+      updatedAt: (mapData['updatedAt'] as Timestamp).toDate(),
     );
   }