fix bug where splitter filters were not taken over to blueprint

src/lib/core/Blueprint.h

@@ -8,6 +8,7 @@
 #include <QString>
 
 #include "BuildingType.h"
+#include "ItemType.h"
 #include "Rotation.h"
 #include "ShipLayout.h"
 
@@ -18,6 +19,11 @@ struct BlueprintBuilding
     QPoint       offset;     // tile offset from bounding-box center (floor for even sizes)
     std::string  recipeId;   // empty = none selected
     std::optional<ShipLayoutConfig> shipLayout;
+
+    // Splitter output filters captured at blueprint creation (REQ-UI-BLUEPRINT-STORAGE).
+    // Empty = accept all. Re-applied to the placed splitter site (REQ-UI-BLUEPRINT-PLACE).
+    std::vector<ItemType> splitterFilterA;
+    std::vector<ItemType> splitterFilterB;
 };
 
 struct Blueprint