Added detailed plugin information to the plugins page (#1013)

Co-authored-by: Thorsten Sommer <SommerEngineering@users.noreply.github.com>

app/MindWork AI Studio/Tools/Services/AssistantPluginGenerationService.cs

@@ -29,7 +29,13 @@ public sealed class AssistantPluginGenerationService(ToolRegistry toolRegistry,
     private const string DEFAULT_AUTHOR = "MindWork AI - Assistant Builder";
     public const string DEFAULT_SUPPORT_CONTACT = "mailto:info@mindwork.ai";
     public const string DEFAULT_SOURCE_URL = "https://github.com/MindWorkAI/AI-Studio";
-    
+
+    /// <summary>
+    /// Now as the plugin field LAST_CHANGED expects it. Every plugin this service writes or has a
+    /// model write is a change made now.
+    /// </summary>
+    private static string NowAsLastChanged => PluginBase.FormatLastChanged(DateTimeOffset.UtcNow);
+
     private static readonly AssistantContextFile[] ASSISTANT_CONTEXT_FILES =
     [
         new("Assistant plugin schema", "Plugins/assistants/README.md", IsRequired: true),
@@ -148,6 +154,7 @@ public sealed class AssistantPluginGenerationService(ToolRegistry toolRegistry,
         var metadata = new DirectChatLauncherPluginMetadata(
             request.PluginId,
             DEFAULT_VERSION,
+            DateTimeOffset.UtcNow,
             [DEFAULT_AUTHOR],
             DEFAULT_SUPPORT_CONTACT,
             DEFAULT_SOURCE_URL,
@@ -426,6 +433,7 @@ public sealed class AssistantPluginGenerationService(ToolRegistry toolRegistry,
                  <fixed_metadata_defaults>
                  ID = "{{request.PluginId}}"
                  VERSION = "{{DEFAULT_VERSION}}"
+                 LAST_CHANGED = "{{NowAsLastChanged}}"
                  TYPE = "ASSISTANT"
                  AUTHORS = {"{{DEFAULT_AUTHOR}}"}
                  SUPPORT_CONTACT = "{{DEFAULT_SUPPORT_CONTACT}}"
@@ -620,6 +628,7 @@ public sealed class AssistantPluginGenerationService(ToolRegistry toolRegistry,
           - A null value in the request JSON means that detail is not available. Never write the word "null" or a field name into the plugin.
           - Keep ID = "{{plugin.Id}}" exactly. Do not create a new plugin ID.
           - Keep TYPE = "ASSISTANT".
+          - Set LAST_CHANGED = "{{NowAsLastChanged}}" right after VERSION, replacing any earlier value.
           - Keep the assistant locally managed. DEPLOYED_USING_CONFIG_SERVER must not be true.
           {{builderMetadataRule}}
           - Set assistant.kind to "CHAT_LAUNCHER" exactly when the revised ASSISTANT table uses LaunchBehavior = "OPEN_WORKSPACE_CHAT_BY_NAME" or "OPEN_TEMPORARY_CHAT"; otherwise set it to "FORM".