Refactor backend into domain-first slices

apps/backend/Universe/Scenario/ScenarioLoader.cs

@@ -0,0 +1,26 @@
+
+namespace SpaceGame.Api.Universe.Scenario;
+
+public sealed class ScenarioLoader
+{
+  private readonly WorldBuilder _worldBuilder;
+
+  public ScenarioLoader(string contentRootPath, WorldGenerationOptions? worldGeneration = null)
+  {
+    var generationOptions = worldGeneration ?? new WorldGenerationOptions();
+    var dataRoot = Path.GetFullPath(Path.Combine(contentRootPath, "..", "..", "shared", "data"));
+    var dataLoader = new DataCatalogLoader(dataRoot);
+    var generationService = new SystemGenerationService();
+    var spatialBuilder = new SpatialBuilder();
+    var seedingService = new WorldSeedingService();
+
+    _worldBuilder = new WorldBuilder(
+      generationOptions,
+      dataLoader,
+      generationService,
+      spatialBuilder,
+      seedingService);
+  }
+
+  public SimulationWorld Load() => _worldBuilder.Build();
+}