migrate doc to wwwroot.

Mech/DemoTopo1.cs

@@ -6,27 +6,22 @@ using Hi.Mech.Topo;
 
 namespace Sample.Mech
 {
-    public class Test : IDisplayee
-    {
-        /// <inheritdoc/>
-        public void Display(Bind bind)
-        {
-            throw new NotImplementedException();
-        }
-        /// <inheritdoc/>
-        public void ExpandToBox3d(Box3d dst)
-        {
-            throw new NotImplementedException();
-        }
-    }
-
+    /// <summary>
+    /// Demonstrates the creation and visualization of mechanical assemblies with kinematic linkages.
+    /// Shows how to build coordinate systems, establish kinematic relationships, and capture visual output.
+    /// </summary>
     /// <remarks>
     /// ### Source Code
     /// [!code-csharp[SampleCode](~/../Hi.Sample/Mech/DemoTopo1.cs)]
     /// </remarks>
     public static class DemoTopo1
     {
-        public static (Asmb asmb,Anchor root) GetDemoAsmb()
+        /// <summary>
+        /// Creates a demonstration assembly with kinematic linkages.
+        /// Builds a mechanical assembly with multiple anchors and branches, including both static and dynamic transformations.
+        /// </summary>
+        /// <returns>A tuple containing the assembly and root anchor</returns>
+        static (Asmb asmb,Anchor root) GetDemoAsmb()
         {
             #region DocSite.DemoTopo1
             //build coordinate systems and the assembly.
@@ -57,7 +52,13 @@ namespace Sample.Mech
 
             return (asmb,O);
         }
-        public static void SnapshotToFile((Asmb asmb, Anchor root) src)
+        
+        /// <summary>
+        /// Captures the assembly visualization and saves it to a file.
+        /// Initializes the display engine, sets up the assembly visualization with an isometric view, and saves a snapshot to a bitmap file.
+        /// </summary>
+        /// <param name="src">A tuple containing the assembly and root anchor for visualization</param>
+        static void SnapshotToFile((Asmb asmb, Anchor root) src)
         {
             //all the drawing function has to call DispEngine.Init() before using.
             DispEngine.Init();