Add deleteAiAssistant function to handle assistant deletion

apps/app/src/features/openai/client/services/ai-assistant.ts

@@ -1,7 +1,11 @@
-import { apiv3Post } from '~/client/util/apiv3-client';
+import { apiv3Post, apiv3Delete } from '~/client/util/apiv3-client';
 
 import type { IApiv3AiAssistantCreateParams } from '../../interfaces/ai-assistant';
 
 export const createAiAssistant = async(body: IApiv3AiAssistantCreateParams): Promise<void> => {
   await apiv3Post('/openai/ai-assistant', body);
 };
+
+export const deleteAiAssistant = async(id: string): Promise<void> => {
+  await apiv3Delete(`/openai/ai-assistant/${id}`);
+};