refactor(interaction): extract world selection query

Move render-hit validation, live target classification, closest-hostile search, selection spheres, use/pickup gates, range checks, and approach parameters behind a read-only App-layer query owner. GameWindow now supplies runtime seams and delegates instead of owning those algorithms.

src/AcDream.App/World/LiveEntityRuntime.cs

@@ -15,6 +15,7 @@ namespace AcDream.App.World;
 public interface ILiveEntityAnimationRuntime
 {
     WorldEntity Entity { get; }
+    uint CurrentMotion { get; }
 }
 
 /// <summary>Remote motion state owned by a live object.</summary>