perf: process 16 chunks/player/tick on dedicated server, revert async save

Chunk loading now batches up to 16 nearest-first requests per player per
tick on dedicated server (client stays at 1), improving tick recovery
time after player join.

Reverts the async save system -- the background thread snapshot/compress
path added complexity without measurable benefit. Autosave on Windows64
server now uses the standard synchronous flush like client, in
preparation for a proper async implementation from upstream.

Minecraft.Server/Windows64/ServerMain.cpp

@@ -16,7 +16,6 @@
 #include "..\Security\IdentityTokenManager.h"
 #include "..\WorldManager.h"
 #include "..\Console\ServerCli.h"
-#include "..\..\Minecraft.World\ConsoleSaveFileOriginal.h"
 #include "Tesselator.h"
 #include "Windows64/4JLibs/inc/4J_Render.h"
 #include "Windows64/GameConfig/Minecraft.spa.h"
@@ -331,7 +330,6 @@ static void TickCoreSystems()
 	g_NetworkManager.DoWork();
 	ProfileManager.Tick();
 	StorageManager.Tick();
-	ConsoleSaveFileOriginal::CommitPendingAsyncSave();
 }
 
 /**