refactor(runtime): extract the live object frame

src/AcDream.App/Input/LocalPlayerRuntimeState.cs

@@ -0,0 +1,30 @@
+using AcDream.Core.Physics;
+
+namespace AcDream.App.Input;
+
+internal interface ILocalPlayerIdentitySource
+{
+    uint ServerGuid { get; }
+}
+
+/// <summary>
+/// Session-scoped identity slot shared by focused update owners.
+/// </summary>
+internal sealed class LocalPlayerIdentityState : ILocalPlayerIdentitySource
+{
+    public uint ServerGuid { get; set; }
+}
+
+internal interface ILocalPlayerControllerSource
+{
+    PlayerMovementController? Controller { get; }
+}
+
+/// <summary>
+/// The one mutable local movement-controller slot. Player-mode lifecycle owns
+/// assignment; update and presentation owners receive the read-only seam.
+/// </summary>
+internal sealed class LocalPlayerControllerSlot : ILocalPlayerControllerSource
+{
+    public PlayerMovementController? Controller { get; set; }
+}