implement ship modules

src/lib/sim/Building.h

@@ -14,6 +14,7 @@
 #include "ItemType.h"
 #include "Port.h"
 #include "Rotation.h"
+#include "ShipLayout.h"
 #include "Tick.h"
 
 // Per-material input buffer for a production building.
@@ -50,6 +51,7 @@ struct ConstructionSite
     BuildingType type          = BuildingType::Miner;
     std::string  recipeId;                      // may be configured before completion
     Tick         completesAt   = 0;             // 0 = queued but not yet started
+    std::optional<ShipLayoutConfig> shipLayout;
 };
 
 // Weapon state for stationary structures (defence stations).
@@ -85,6 +87,9 @@ struct Building
     std::vector<Port>   inputPorts;  // perimeter tiles (minus output-port tiles),
                                      // direction pointing INTO building
 
+    // Module layout for shipyards (REQ-MOD-LAYOUT).
+    std::optional<ShipLayoutConfig> shipLayout;
+
     // Set only for defence stations; nullopt for all other building types.
     std::optional<StationWeapon> weapon;
 };