refactor AI system

src/lib/ecs/component/SalvageScrapBehavior.h

@@ -0,0 +1,14 @@
+#pragma once
+
+#include <optional>
+
+#include <QVector2D>
+
+// Collect-scrap behavior (one half of the old SalvageBehaviorComponent). The
+// evaluator finds the nearest scrap and sets scrapTarget when cargo is not full.
+struct SalvageScrapBehavior
+{
+    std::optional<QVector2D> scrapTarget;
+    float                    maxCollectionRange_tiles = 0.0f;
+    float                    score = 0.0f;
+};