switch to ECS architecture

src/lib/sim/Simulation.h

@@ -9,6 +9,9 @@
 #include <QPoint>
 
 #include "BeltSystem.h"
+#include "EntityAdmin.h"
+
+#include "entt/entity/entity.hpp"
 #include "SchematicDropEvent.h"
 #include "BuildingType.h"
 #include "EntityId.h"
@@ -73,6 +76,8 @@ public:
     const ShipSystem&     ships() const;
     ScrapSystem&          scraps();
     const ScrapSystem&    scraps() const;
+    EntityAdmin&          admin();
+    const EntityAdmin&    admin() const;
 
 private:
     EntityId allocateId();  // Strictly increasing; never returns kInvalidEntityId.
@@ -100,10 +105,11 @@ private:
     bool     m_gameOver = false;
 
     // Pre-placed structure IDs.
-    EntityId m_hqId;
-    EntityId m_playerStation1Id;
-    EntityId m_playerStation2Id;
-    EntityId m_currentEnemyStationIds[2];
+    EntityId     m_hqBuildingId;           // Building id (for belt integration)
+    entt::entity m_hqProxyEntity;          // ECS entity (HP, targeting)
+    entt::entity m_playerStation1Entity;
+    entt::entity m_playerStation2Entity;
+    entt::entity m_currentEnemyStationEntities[2];
 
     // Schematic unlock state (REQ-DEF-SCHEMATIC-DROP).
     struct SchematicState
@@ -113,6 +119,7 @@ private:
     };
     std::map<std::string, SchematicState> m_schematicLevels;
 
+    EntityAdmin                       m_admin;
     BeltSystem                        m_beltSystem;
     std::unique_ptr<BuildingSystem>   m_buildingSystem;
     std::unique_ptr<ShipSystem>       m_shipSystem;