refactor AI system

src/lib/ecs/component/AdvanceBehavior.h

@@ -0,0 +1,9 @@
+#pragma once
+
+// Baseline fallback behavior, present on every ship. The executor moves the ship
+// toward the opposing side (direction derived from FactionComponent), so a ship
+// with no better behavior keeps advancing.
+struct AdvanceBehavior
+{
+    float score = 0.0f;
+};