feat(api): add NestStrategy, NestRequestPart, NestRequest

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

OpenNest.Api/NestRequest.cs

@@ -0,0 +1,15 @@
+using System.Collections.Generic;
+using OpenNest.Geometry;
+
+namespace OpenNest.Api;
+
+public class NestRequest
+{
+    public IReadOnlyList<NestRequestPart> Parts { get; init; } = [];
+    public Size SheetSize { get; init; } = new(60, 120);
+    public string Material { get; init; } = "Steel, A1011 HR";
+    public double Thickness { get; init; } = 0.06;
+    public double Spacing { get; init; } = 0.1;
+    public NestStrategy Strategy { get; init; } = NestStrategy.Auto;
+    public CutParameters Cutting { get; init; } = CutParameters.Default;
+}

OpenNest.Api/NestRequestPart.cs

@@ -0,0 +1,9 @@
+namespace OpenNest.Api;
+
+public class NestRequestPart
+{
+    public string DxfPath { get; init; }
+    public int Quantity { get; init; } = 1;
+    public bool AllowRotation { get; init; } = true;
+    public int Priority { get; init; } = 0;
+}

OpenNest.Api/NestStrategy.cs

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+namespace OpenNest.Api;
+
+public enum NestStrategy { Auto }

OpenNest.Tests/Api/NestRequestTests.cs

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+using OpenNest.Api;
+using OpenNest.Geometry;
+
+namespace OpenNest.Tests.Api;
+
+public class NestRequestTests
+{
+    [Fact]
+    public void Default_Request_HasSensibleDefaults()
+    {
+        var request = new NestRequest();
+
+        Assert.Empty(request.Parts);
+        Assert.Equal(60, request.SheetSize.Width);
+        Assert.Equal(120, request.SheetSize.Length);
+        Assert.Equal("Steel, A1011 HR", request.Material);
+        Assert.Equal(0.06, request.Thickness);
+        Assert.Equal(0.1, request.Spacing);
+        Assert.Equal(NestStrategy.Auto, request.Strategy);
+        Assert.NotNull(request.Cutting);
+    }
+
+    [Fact]
+    public void Parts_Accessible_AfterConstruction()
+    {
+        var request = new NestRequest
+        {
+            Parts = [new NestRequestPart { DxfPath = "test.dxf", Quantity = 5 }]
+        };
+
+        Assert.Single(request.Parts);
+        Assert.Equal("test.dxf", request.Parts[0].DxfPath);
+        Assert.Equal(5, request.Parts[0].Quantity);
+    }
+
+    [Fact]
+    public void NestRequestPart_Defaults()
+    {
+        var part = new NestRequestPart { DxfPath = "part.dxf" };
+
+        Assert.Equal(1, part.Quantity);
+        Assert.True(part.AllowRotation);
+        Assert.Equal(0, part.Priority);
+    }
+}