Added tool calling support (#731)

Co-authored-by: krut_ni <nils.kruthoff@dlr.de>
Co-authored-by: Thorsten Sommer <SommerEngineering@users.noreply.github.com>

app/MindWork AI Studio/Provider/OpenAI/ResponsesAPIRequest.cs

@@ -6,16 +6,16 @@ namespace AIStudio.Provider.OpenAI;
 /// The request body for the Responses API.
 /// </summary>
 /// <param name="Model">Which model to use.</param>
-/// <param name="Input">The chat messages.</param>
+/// <param name="Input">The chat messages and Responses API input items.</param>
 /// <param name="Stream">Whether to stream the response.</param>
 /// <param name="Store">Whether to store the response on the server (usually OpenAI's infrastructure).</param>
-/// <param name="ProviderTools">The provider-side tools to use for the request.</param>
+/// <param name="Tools">The provider-side tools and local function tools to use for the request.</param>
 public record ResponsesAPIRequest(
     string Model,
-    IList<IMessageBase> Input,
+    IList<object> Input,
     bool Stream,
     bool Store,
-    [property: JsonPropertyName("tools")] IList<ProviderTool> ProviderTools)
+    IList<object> Tools)
 {
     public ResponsesAPIRequest() : this(string.Empty, [], true, false, [])
     {