Create node graph page

Media.JoshHeaps.Net/Models/Graph.cs

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+namespace Media.JoshHeaps.Net.Models;
+
+public class Graph
+{
+    public long Id { get; set; }
+    public long UserId { get; set; }
+    public string Name { get; set; } = string.Empty;
+    public string? Description { get; set; }
+    public DateTime CreatedAt { get; set; }
+    public DateTime UpdatedAt { get; set; }
+}
+
+public class GraphWithCounts : Graph
+{
+    public int NodeCount { get; set; }
+    public int EdgeCount { get; set; }
+}

Media.JoshHeaps.Net/Models/GraphEdge.cs

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+namespace Media.JoshHeaps.Net.Models;
+
+public class GraphEdge
+{
+    public long Id { get; set; }
+    public long GraphId { get; set; }
+    public long SourceNodeId { get; set; }
+    public long TargetNodeId { get; set; }
+    public DateTime CreatedAt { get; set; }
+}
+
+public class GraphData
+{
+    public Graph Graph { get; set; } = new();
+    public List<GraphNodeWithConnections> Nodes { get; set; } = [];
+    public List<GraphEdge> Edges { get; set; } = [];
+}

Media.JoshHeaps.Net/Models/GraphNode.cs

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+namespace Media.JoshHeaps.Net.Models;
+
+public class GraphNode
+{
+    public long Id { get; set; }
+    public long GraphId { get; set; }
+    public string Label { get; set; } = string.Empty;
+    public string? Notes { get; set; }
+    public DateTime CreatedAt { get; set; }
+    public DateTime UpdatedAt { get; set; }
+}
+
+public class GraphNodeWithConnections : GraphNode
+{
+    public int ConnectionCount { get; set; }
+}