refactor(runtime): define the update-frame contract

src/AcDream.App/World/RetailLiveFrameCoordinator.cs

@@ -1,3 +1,5 @@
+using AcDream.App.Update;
+
 namespace AcDream.App.World;
 
 /// <summary>
@@ -45,9 +47,5 @@ public sealed class RetailLiveFrameCoordinator
     }
 
     public static double NormalizeDeltaSeconds(double deltaSeconds) =>
-        double.IsFinite(deltaSeconds)
-        && deltaSeconds > 0.0
-        && deltaSeconds <= float.MaxValue
-            ? deltaSeconds
-            : 0.0;
+        UpdateFrameClock.NormalizeDeltaSeconds(deltaSeconds);
 }