Integrate Vercel image upload for featured images

Optimized image upload process by integrating Vercel's image upload functionality. Ensured the image buffer is fetched and converted before uploading. Updated the database to store the Vercel URL as the featured image path.

app/researcher/researcherActions.ts

@@ -10,6 +10,7 @@ import {
   writeArticle
 } from "@/lib/agents/researcher/researcher";
 import OpenAI from "openai";
+import {uploadImageToVercel} from "@/lib/imageUploader";
 const openai = new OpenAI({
     apiKey: process.env.OPENAI_API_KEY,
 })
@@ -98,13 +99,20 @@ export async function generateImage(topic: string, articleId: string) {
     })
 
     const imageUrl = response.data[0].url
+    if (!imageUrl) {
+      throw new Error("Failed to generate image")
+    }
+    const imgPath = 'articles/' + articleId + '/featured-image'
+    // get the buffer from the imageUrl
+    const buffer = await fetch(imageUrl).then(res => res.arrayBuffer())
+    const vercelUrl = await uploadImageToVercel(Buffer.from(buffer), imgPath)
     if (imageUrl && articleId) {
       await prisma.article.update({
         where: {
           id: articleId,
         },
         data: {
-          featuredImage: imageUrl,
+          featuredImage: vercelUrl,
         },
       })
     }