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/Logic/ReleasePointHandler.cs

@@ -0,0 +1,19 @@
+using System.Collections.Generic;
+using SimpleLite.RCS.CarTypes;
+using StandardScene.Signal.Model;
+using StandardScene.Signal.Plc;
+
+namespace StandardScene.Signal.Logic
+{
+    /// <summary>对齐反编译 StarSignManage：配置点停稳则停充并放行。</summary>
+    public static class ReleasePointHandler
+    {
+        public static void OnStopped(Car car, int sit, IReadOnlyDictionary<int, ReleasePointModel> points)
+        {
+            if (points == null || !points.TryGetValue(sit, out var p) || p == null || !p.IsUse)
+                return;
+            SignalCarAdapter.StopCharge(car);
+            SignalCarAdapter.Start(car);
+        }
+    }
+}