新增 scene.signal 信号交互插件，落地 PLC 握手与扫车放行。

Co-authored-by: Cursor <cursoragent@cursor.com>

StandardScene.Signal/Model/HandshakePointModel.cs

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+using System.ComponentModel;
+
+namespace StandardScene.Signal.Model
+{
+    /// <summary>
+    /// 握手点配置。对应老地图点上的 <c>SignalStop</c>（SignalType + SignalParams）。
+    /// 站点 fields 若已填写同名键，优先用站点字段。
+    /// </summary>
+    public class HandshakePointModel
+    {
+        [DisplayName("站点")]
+        public int Sit { get; set; }
+
+        [DisplayName("信号类型")]
+        public string SignalType { get; set; } = "JGControl";
+
+        [DisplayName("信号参数")]
+        public string SignalParams { get; set; } = "";
+    }
+}

StandardScene.Signal/Model/PlcStationModel.cs

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+using System.ComponentModel;
+
+namespace StandardScene.Signal.Model
+{
+    /// <summary>
+    /// PLC 机构配置。对应反编译 <c>PLCModel</c> 的可存档字段；读写运行态不进本类。
+    /// </summary>
+    public class PlcStationModel
+    {
+        [DisplayName("机构名称")]
+        public string JgName { get; set; } = "";
+
+        [DisplayName("机构IP")]
+        public string Ip { get; set; } = "127.0.0.1";
+
+        [DisplayName("端口")]
+        public int Port { get; set; } = 102;
+
+        [DisplayName("读地址")]
+        public string ReadDb { get; set; } = "";
+
+        [DisplayName("写地址")]
+        public string WriteDb { get; set; } = "";
+
+        [DisplayName("写心跳地址")]
+        public string HeartDb { get; set; } = "";
+
+        [DisplayName("机构进入地标")]
+        public int JgInPointId { get; set; }
+
+        [DisplayName("机构进入包含地标")]
+        public string JgInContains { get; set; } = "";
+
+        [DisplayName("机构地标")]
+        public int JgPointId { get; set; }
+
+        [DisplayName("机构包含地标")]
+        public string JgContains { get; set; } = "";
+
+        [DisplayName("上下机构")]
+        public SignalLineType LineType { get; set; } = SignalLineType.未知;
+    }
+}

StandardScene.Signal/Model/PlcStationSnapshot.cs

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+using System.ComponentModel;
+
+namespace StandardScene.Signal.Model
+{
+    /// <summary>单个机构运行态快照，供 MissionStatus / 监视面板展示。</summary>
+    public class PlcStationSnapshot
+    {
+        [DisplayName("机构")] public string JgName { get; set; } = "";
+        [DisplayName("连接")] public bool IsConnected { get; set; }
+        [DisplayName("读信号")] public string ReadSignal { get; set; } = "";
+        [DisplayName("写信号")] public string WriteSignal { get; set; } = "";
+        [DisplayName("回读写值")] public string ReadWriteSignal { get; set; } = "";
+        [DisplayName("机构内车")] public int InAgvNo { get; set; }
+        [DisplayName("请求进入车")] public int RequestInAgvNo { get; set; }
+        [DisplayName("写入成功")] public bool WriteSuccess { get; set; }
+        [DisplayName("心跳")] public bool Heart { get; set; }
+        [DisplayName("最近错误")] public string LastError { get; set; } = "";
+    }
+}

StandardScene.Signal/Model/ReleasePointModel.cs

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+using System.ComponentModel;
+
+namespace StandardScene.Signal.Model
+{
+    /// <summary>放行点配置。对应反编译 <c>StartSignModel</c>。</summary>
+    public class ReleasePointModel
+    {
+        [DisplayName("放行站点")]
+        public int Sit { get; set; }
+
+        [DisplayName("启用")]
+        public bool IsUse { get; set; } = true;
+    }
+}

StandardScene.Signal/Model/SignalEnums.cs

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+namespace StandardScene.Signal.Model
+{
+    /// <summary>PLC → 调度：读字节含义（与反编译 ENUM_READ_SIGNAL 对齐）。</summary>
+    public enum SignalReadValue : byte
+    {
+        无状态 = 0,
+        允许进入 = 1,
+        允许离开 = 2
+    }
+
+    /// <summary>调度 → PLC：写字节含义（与反编译 ENUM_WRITE_SIGNAL 对齐）。</summary>
+    public enum SignalWriteValue : byte
+    {
+        无状态 = 0,
+        进入中 = 1,
+        到位 = 2,
+        离开中 = 3,
+        已离开 = 4
+    }
+
+    /// <summary>机构类型（与反编译 ENUM_JGTYPE 对齐）。</summary>
+    public enum SignalLineType : byte
+    {
+        未知 = 0,
+        上线机构 = 1,
+        单牵引下线机构 = 2,
+        双牵引下线机构 = 3,
+        等待通行机构 = 4
+    }
+}