fix(physics): keep remote placement and targeting in one world frame

CreateObject positions are landblock-local, but Runtime first-entry previously submitted remotes with a zero world offset. Runtime now owns the accepted local-player world-frame center and converts remote placements before SetPosition. The local physics host also publishes body.Position rather than CellPosition's landblock-local origin, so TargetManager no longer directs monsters toward a phantom player position. User gate: monster/static placement, chase, and attacks accepted outside Tusker Barracks.

src/AcDream.Runtime/Gameplay/RuntimeLocalPlayerPhysicsPublicationState.cs

@@ -243,7 +243,16 @@ internal sealed class RuntimeLocalPlayerPhysicsPublicationState : IDisposable
                 motion,
                 stopCompletely: () =>
                     _ = controller.StopCompletelyAtPhysicsObjectBoundary(),
-                getPosition: () => body.CellPosition,
+                // App/Runtime movement managers use one normalized world
+                // coordinate frame. PhysicsBody.CellPosition deliberately
+                // retains retail's landblock-local origin for cell transit;
+                // publishing it here made every remote TargetManager chase a
+                // different point whenever the player and world origin were
+                // not the same landblock.
+                getPosition: () => new Position(
+                    body.CellPosition.ObjCellId,
+                    body.Position,
+                    body.Orientation),
                 getHeading: () => MoveToMath.GetHeading(body.Orientation),
                 setHeading: (heading, _) => body.Orientation =
                     MoveToMath.SetHeading(body.Orientation, heading),
@@ -268,7 +277,10 @@ internal sealed class RuntimeLocalPlayerPhysicsPublicationState : IDisposable
         };
         physicsHost = new EntityPhysicsHost(
             record.ServerGuid,
-            getPosition: () => body.CellPosition,
+            getPosition: () => new Position(
+                body.CellPosition.ObjCellId,
+                body.Position,
+                body.Orientation),
             getVelocity: () => body.Velocity,
             getRadius: () => preparedActivation.Radius,
             inContact: () => body.InContact,