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.Server/Windows64/ServerMain.cpp

@@ -371,6 +371,19 @@ int main(int argc, char **argv)
 	config.showHelp = false;
 
 	SetConsoleCtrlHandler(ConsoleCtrlHandlerProc, TRUE);
+
+	// Disable QuickEdit mode so clicking in the console window doesn't freeze
+	// the server process. Without this, any accidental click pauses all threads
+	// that write to stdout until a key is pressed.
+	{
+		HANDLE hInput = GetStdHandle(STD_INPUT_HANDLE);
+		DWORD mode = 0;
+		GetConsoleMode(hInput, &mode);
+		mode &= ~ENABLE_QUICK_EDIT_MODE;
+		mode |= ENABLE_EXTENDED_FLAGS;
+		SetConsoleMode(hInput, mode);
+	}
+
 	SetExeWorkingDirectory();
 
 	// Load base settings from server.properties, then override with CLI values when provided