optimize OnRoutingRulesLoaded

Author: yileicn

src/Infrastructure/BotSharp.Abstraction/Routing/Models/RoutingRule.cs

@@ -37,6 +37,21 @@ public override string ToString()
 
     public RoutingRule()
     {
-        
     }
+
+    /// <summary>
+    /// Returns a defensive copy so hook mutations do not affect cached/shared instances.
+    /// </summary>
+    public RoutingRule Clone() => new RoutingRule
+    {
+        AgentId = AgentId,
+        AgentName = AgentName,
+        Type = Type,
+        Field = Field,
+        Description = Description,
+        FieldType = FieldType,
+        Required = Required,
+        RedirectTo = RedirectTo,
+        RedirectToAgentName = RedirectToAgentName
+    };
 }

src/Infrastructure/BotSharp.Core/Routing/RoutingService.cs

@@ -149,6 +149,7 @@ public async Task<RoutingRule[]> GetRulesByAgentName(string name)
         var records = await GetRoutingRecords();
         var rules = records
             .Where(x => x.AgentName.ToLower() == name.ToLower())
+            .Select(r => r.Clone())
             .ToList();
         if (rules.Count > 0)
         {
@@ -163,6 +164,7 @@ public async Task<RoutingRule[]> GetRulesByAgentId(string id)
         var records = await GetRoutingRecords();
         var rules = records
             .Where(x => x.AgentId == id)
+            .Select(r => r.Clone())
             .ToList();
         if (rules.Count > 0)
         {