move ecs related code to own folder

src/lib/ecs/component/DynamicBodyComponent.h

@@ -0,0 +1,21 @@
+#pragma once
+
+#include <QVector2D>
+
+struct DynamicBodyComponent
+{
+    // --- dynamics parameters (formerly ShipDynamics) ---
+    float maxSpeedPerTick;
+    float mainAccelerationPerTick;
+    float maneuveringAccelerationPerTick;
+    float angularAccelerationPerTick;
+    float maxRotationSpeedPerTick;
+
+    // --- integrated state ---
+    QVector2D velocity;
+    float     angularVelocity;
+
+    // --- written each tick by MovementIntentSystem, consumed by DynamicBodySystem ---
+    QVector2D linearAcceleration;
+    float     angularAcceleration;
+};