improvement on gm windows, ai

apps/backend/Universe/Runtime/SimulationWorld.cs

@@ -5,7 +5,7 @@ public sealed class SimulationWorld
 {
     public required string Label { get; init; }
     public required int Seed { get; init; }
-    public required BalanceDefinition Balance { get; init; }
+    public required BalanceDefinition Balance { get; set; }
     public required List<SystemRuntime> Systems { get; init; }
     public required List<ResourceNodeRuntime> Nodes { get; init; }
     public required List<CelestialRuntime> Celestials { get; init; }