fix: dedicated server thread safety, disconnect deadlock, and console freeze

- Protect PlayerList and ServerConnection players vectors with critical
  sections; all iterations use copy-on-read snapshots to prevent iterator
  invalidation during concurrent join/leave
- Add null check on player bounding box in movement validation to prevent
  crash when player is removed mid-tick
- Re-validate socket player pointer immediately before SendData to narrow
  the TOCTOU race window on disconnect
- Replace inline disconnect cleanup with a queued system drained on the
  main tick thread, eliminating the done_cs -> m_playersCS lock inversion
  that caused deadlocks under load
- Disable Windows QuickEdit mode at server startup to prevent console
  input selection from freezing the process
- Move chunk priority sort behind ServerConnection::sortPlayersByChunkPriority()
  to keep the players vector lock-protected

Minecraft.Client/PlayerList.h

@@ -24,11 +24,26 @@ private:
 //    public static Logger logger = Logger.getLogger("Minecraft");
 public:
 	vector<shared_ptr<ServerPlayer> > players;
+	CRITICAL_SECTION m_playersCS; // Protects players vector for concurrent access
+	vector<shared_ptr<ServerPlayer> > getPlayersSnapshot();
 
 private:
 	MinecraftServer *server;
     unsigned int maxPlayers;
 
+	// Pending disconnect queue: disconnect() enqueues here, tick() drains it.
+	// This avoids holding done_cs across PlayerList operations (deadlock fix).
+	struct PendingDisconnect
+	{
+		shared_ptr<ServerPlayer> player;
+		int reason;
+		wstring kickMessage;
+		bool wasKicked;
+		bool fourKitHandledQuit;
+	};
+	deque<PendingDisconnect> m_pendingDisconnects;
+	CRITICAL_SECTION m_disconnectCS;
+
 	// 4J Added
 	vector<PlayerUID> m_bannedXuids;
 	CRITICAL_SECTION m_banCS; // 4J Added - protects m_bannedXuids for concurrent access
@@ -82,6 +97,7 @@ public:
     void add(shared_ptr<ServerPlayer> player);
     void move(shared_ptr<ServerPlayer> player);
     void remove(shared_ptr<ServerPlayer> player);
+	void queueDisconnect(shared_ptr<ServerPlayer> player, int reason, const wstring& kickMessage, bool wasKicked, bool fourKitHandledQuit);
     shared_ptr<ServerPlayer> getPlayerForLogin(PendingConnection *pendingConnection, const wstring& userName, PlayerUID xuid, PlayerUID OnlineXuid);
     shared_ptr<ServerPlayer> respawn(shared_ptr<ServerPlayer> serverPlayer, int targetDimension, bool keepAllPlayerData);
     void toggleDimension(shared_ptr<ServerPlayer> player, int targetDimension);