feat: implement dynamic knowledge graph updates and state management services

src/NexusReader.Application/Queries/Graph/GetKnowledgeGraphQueryHandler.cs

@@ -7,24 +7,9 @@ internal sealed class GetKnowledgeGraphQueryHandler : IQueryHandler<GetKnowledge
 {
     public Task<Result<GraphDataDto>> Handle(GetKnowledgeGraphQuery request, CancellationToken cancellationToken)
     {
-        var nodes = new List<GraphNodeDto>
-        {
-            new("renesans-intro", "Renesans", "Concept"),
-            new("florencja", "Florencja", "Location"),
-            new("medyceusze", "Medyceusze", "Entity"),
-            new("da-vinci-ai", "Leonardo da Vinci", "Person"),
-            new("humanizm", "Humanizm", "Concept")
-        };
+        var nodes = new List<GraphNodeDto>();
+        var links = new List<GraphLinkDto>();
 
-        var links = new List<GraphLinkDto>
-        {
-            new("renesans-intro", "florencja", 1),
-            new("florencja", "medyceusze", 2),
-            new("medyceusze", "da-vinci-ai", 3),
-            new("renesans-intro", "humanizm", 1),
-            new("da-vinci-ai", "humanizm", 2)
-        };
-
-        return Task.FromResult(Result.Ok(new GraphDataDto(nodes, links)));
+        return Task.FromResult(Result.Ok(new GraphDataDto { Nodes = nodes, Links = links }));
     }
 }