Improved the OpenAI provider (#548)

app/MindWork AI Studio/Provider/Fireworks/ProviderFireworks.cs

@@ -4,6 +4,7 @@ using System.Text;
 using System.Text.Json;
 
 using AIStudio.Chat;
+using AIStudio.Provider.OpenAI;
 using AIStudio.Settings;
 
 namespace AIStudio.Provider.Fireworks;
@@ -77,7 +78,7 @@ public class ProviderFireworks(ILogger logger) : BaseProvider("https://api.firew
             return request;
         }
         
-        await foreach (var content in this.StreamChatCompletionInternal<ResponseStreamLine>("Fireworks", RequestBuilder, token))
+        await foreach (var content in this.StreamChatCompletionInternal<ResponseStreamLine, ChatCompletionAnnotationStreamLine>("Fireworks", RequestBuilder, token))
             yield return content;
     }
 

app/MindWork AI Studio/Provider/Fireworks/ResponseStreamLine.cs

@@ -15,6 +15,20 @@ public readonly record struct ResponseStreamLine(string Id, string Object, uint
 
     /// <inheritdoc />
     public ContentStreamChunk GetContent() => new(this.Choices[0].Delta.Content, []);
+
+    #region Implementation of IAnnotationStreamLine
+
+    //
+    // Currently, Fireworks does not provide source citations in their response stream.
+    //
+    
+    /// <inheritdoc />
+    public bool ContainsSources() => false;
+
+    /// <inheritdoc />
+    public IList<ISource> GetSources() => [];
+
+    #endregion
 }
 
 /// <summary>