feat(battle-engine): AOT/SFB/Steam/DisallowMultiple + FriendDataBase.SetPlayerData

Clears the last type+header frontier (RoomInviteFriendColum override). Per F3 this
unmasks the remaining View/UI/god-object member bodies (~8k) -- the next grind is
pure member-surface growth, closure (~3242 files) now essentially complete.

SVSim.BattleEngine/Shim/External/LooseEnds.cs

@@ -49,8 +49,20 @@ namespace Steamworks
     public sealed class Callback<T> { }
     // Microtransaction auth response struct (referenced as a callback type arg).
     public struct MicroTxnAuthorizationResponse_t { }
+    // Steam warning-message hook delegate (referenced as a type only).
+    public delegate void SteamAPIWarningMessageHook_t(int severity, System.Text.StringBuilder debugText);
 }
 
+// AOT P/Invoke callback attribute (IL2CPP) + StandaloneFileBrowser anchor.
+namespace AOT
+{
+    public sealed class MonoPInvokeCallbackAttribute : System.Attribute
+    {
+        public MonoPInvokeCallbackAttribute(System.Type type) { }
+    }
+}
+namespace SFB { internal class _ShimAnchor { } }
+
 // ---- third-party SDK namespace anchors (referenced via `using`) ----
 namespace Facebook { internal class _ShimAnchor { } }
 namespace Facebook.Unity { internal class _ShimAnchor { } }

SVSim.BattleEngine/Shim/UnityEngine/UnityShim.cs

@@ -342,6 +342,7 @@ namespace UnityEngine
     public class HideInInspector : Attribute { }
     public class ExecuteInEditMode : Attribute { }
     public class ExecuteAlwaysAttribute : Attribute { }
+    public class DisallowMultipleComponentAttribute : Attribute { }
     public class AndroidJavaObject : IDisposable { public AndroidJavaObject(string className, params object[] args) { } public T Call<T>(string method, params object[] args) => default; public void Call(string method, params object[] args) { } public T Get<T>(string name) => default; public void Set<T>(string name, T val) { } public void Dispose() { } }
     public class WebCamTexture : Texture { public WebCamTexture() { } public WebCamTexture(int w, int h, int fps) { } public void Play() { } public void Stop() { } public bool isPlaying => false; public Color32[] GetPixels32() => new Color32[0]; }
     public class AddComponentMenu : Attribute { public AddComponentMenu(string n) { } public AddComponentMenu(string n, int o) { } }

SVSim.BattleEngine/Shim/View/StoryTitleStubs.cs

@@ -22,7 +22,14 @@ namespace Wizard.Story.ChapterSelection.SelectionProcessing.Main
     public class Parameter { }
 }
 
-namespace Wizard.UIFriend { public class Friend { public class PlayerData { } } }
+namespace Wizard.UIFriend
+{
+    public class Friend { public class PlayerData { } }
+    public class FriendDataBase
+    {
+        public virtual void SetPlayerData(Friend.PlayerData in_PlayerData, System.Collections.Generic.List<string> in_LoadList) { }
+    }
+}
 namespace Wizard.Title { public class GameSetup { } }
 namespace Wizard.RoomMatch { public class Player { } }