Initial commit: NexusArchitect Professional Workstation Overhaul

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

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+using NexusReader.Application.Abstractions.Messaging;
+
+namespace NexusReader.Application.Queries.Graph;
+
+public record GetKnowledgeGraphQuery : IQuery<GraphDataDto>;

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

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+using FluentResults;
+using NexusReader.Application.Abstractions.Messaging;
+
+namespace NexusReader.Application.Queries.Graph;
+
+internal sealed class GetKnowledgeGraphQueryHandler : IQueryHandler<GetKnowledgeGraphQuery, GraphDataDto>
+{
+    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 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)));
+    }
+}

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

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+namespace NexusReader.Application.Queries.Graph;
+
+public record GraphNodeDto(string Id, string Label, string Group);
+public record GraphLinkDto(string Source, string Target, int Value);
+public record GraphDataDto(List<GraphNodeDto> Nodes, List<GraphLinkDto> Links);