fix: move async save commit off game thread to prevent disk I/O stall

StorageManager.SaveSaveData() blocks until the disk write completes.
Calling it from the game thread caused 2.5s freezes. Now it only runs
from TickCoreSystems() on the ServerMain thread, which operates
independently of the game tick loop.

Minecraft.Client/MinecraftServer.cpp

@@ -2258,11 +2258,6 @@ void MinecraftServer::tick()
 	PIXBeginNamedEvent(0,"Players tick");
 	players->tick();
 	PIXEndNamedEvent();
-#if defined(_WINDOWS64)
-	// Commit any pending async autosave on the game thread (same thread
-	// that called Flush/AllocateSaveData, which StorageManager requires).
-	ConsoleSaveFileOriginal::CommitPendingAsyncSave();
-#endif
 	PIXBeginNamedEvent(0,"Connection tick");
 	connection->tick();
 	PIXEndNamedEvent();