cull(engine-cleanup): pass-8 phase-2 cascade round 1

[trim] fully-unreachable files deleted: 6
[trim] files edited: 55, files deleted: 0, nodes removed: 244
[type-trim] files edited: 1, types removed: 1

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

SVSim.BattleEngine/Engine/RealTimeNetworkAgent.cs

@@ -41,11 +41,8 @@ public class RealTimeNetworkAgent : MonoBehaviour
     public bool IsReceiveSelfDisconnect => false;
     public int LastEmitSeqNumber => 0;
     public INetworkLogger<NetworkLog> NetworkLogger { get; protected set; }
-    public string NowSocketID => string.Empty;
 
     public int GetIsFirstPlayer() => 0;
-    public int GetViewId() => 0;
-    public long GetBattleId() => 0L;
     public void SetCurrentMatchingStatus(MatchingStatus status) { }
     public void SetNetworkBattleMgr(NetworkBattleManagerBase mgr) { }