feat: simplifying the simulation

apps/backend/Simulation/SimulationEngine.ResourceAndInfrastructureSystems.cs

@@ -106,10 +106,38 @@ public sealed partial class SimulationEngine
 
   private static string? GetNextStationModuleToBuild(StationRuntime station, SimulationWorld world)
   {
+    // Expand storage before it becomes a bottleneck
+    const float StorageExpansionThreshold = 0.85f;
+    var storageExpansionCandidates = new[]
+    {
+      ("solid", "bulk-bay"),
+      ("liquid", "liquid-tank"),
+      ("container", "container-bay"),
+    };
+
+    foreach (var (storageClass, moduleId) in storageExpansionCandidates)
+    {
+      var capacity = GetStationStorageCapacity(station, storageClass);
+      if (capacity <= 0.01f)
+      {
+        continue;
+      }
+
+      var used = station.Inventory
+          .Where(entry => world.ItemDefinitions.TryGetValue(entry.Key, out var def) && def.CargoKind == storageClass)
+          .Sum(entry => entry.Value);
+
+      if (used / capacity >= StorageExpansionThreshold && world.ModuleRecipes.ContainsKey(moduleId))
+      {
+        return moduleId;
+      }
+    }
+
     var priorities = GetFactionExpansionPressure(world, station.FactionId) > 0f
         ? new (string ModuleId, int TargetCount)[]
         {
                 ("refinery-stack", 1),
+                ("bulk-bay", 1),
                 ("container-bay", 1),
                 ("fabricator-array", 2),
                 ("component-factory", 1),
@@ -120,6 +148,7 @@ public sealed partial class SimulationEngine
         : new (string ModuleId, int TargetCount)[]
         {
                 ("refinery-stack", 1),
+                ("bulk-bay", 1),
                 ("container-bay", 1),
                 ("fabricator-array", 2),
                 ("component-factory", 1),