refactor: restructure interaction system into clean layers

src/Features/Interactions/Domain/DropPosition.cs

@@ -0,0 +1,26 @@
+using Godot;
+
+namespace Game.Features.Interactions.Domain;
+
+public readonly record struct DropRayHit(
+    Vector3 Origin,
+    Vector3 Direction,
+    float RayLength,
+    bool IsBlocked,
+    Vector3 BlockPoint
+);
+
+public static class DropPosition
+{
+    public static Vector3 CalculateFrom(DropRayHit hit)
+    {
+        float distance = hit.RayLength;
+
+        if (hit.IsBlocked)
+        {
+            distance = Mathf.Max(0.25f, hit.Origin.DistanceTo(hit.BlockPoint) - 0.2f);
+        }
+
+        return hit.Origin + hit.Direction * distance;
+    }
+}