Disable agent by default.

src/Infrastructure/BotSharp.Abstraction/Agents/Models/Agent.cs

@@ -61,7 +61,10 @@ public class Agent
     /// </summary>
     public bool AllowRouting {  get; set; }
 
-    public bool Disabled { get; set; }
+    /// <summary>
+    /// Default is True, user will enable this by installing appropriate plugin.
+    /// </summary>
+    public bool Disabled { get; set; } = true;
     public string IconUrl { get; set; }
 
     /// <summary>

src/Infrastructure/BotSharp.Core/data/agents/01fcc3e5-9af7-49e6-ad7a-a760bd12dc4a/agent.json

@@ -5,5 +5,6 @@
   "updatedDateTime": "2023-08-18T14:39:32.2349686Z",
   "id": "01fcc3e5-9af7-49e6-ad7a-a760bd12dc4a",
   "iconUrl": "https://cdn.iconscout.com/icon/premium/png-256-thumb/route-1613278-1368497.png",
+  "disabled": false,
   "isPublic": true
 }