fix(provider): fix anthropic integration

ts/abstract.classes.multimodal.ts

@@ -16,7 +16,10 @@ export abstract class MultiModalModel {
       role: 'assistant' | 'user';
       content: string;
     }[]
-  }): Promise<{}>
+  }): Promise<{
+    role: 'assistant';
+    message: string;
+  }>
   
   /**
    * Defines a streaming interface for chat interactions.