docs: add S7 PLC simulator system design document

wanshenmean

2026-03-13 951a216adddb09d7c352850990bfdc4efbcd186d

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namespace WIDESEAWCS_Tasks
{
    public class CheckPalletPosition
    {
        public string Code { get; set; } = string.Empty;
 
        public int WarehouseId { get; set; } = 0;
    }
}