Fix: Implement Cloudflare direct creator upload

supabase/functions/upload-image/index.ts

@@ -23,18 +23,25 @@ serve(async (req) => {
       // Request a direct upload URL from Cloudflare
       const { metadata = {} } = await req.json().catch(() => ({}))
 
+      // Create FormData for the request (Cloudflare API requires multipart/form-data)
+      const formData = new FormData()
+      formData.append('requireSignedURLs', 'false')
+      
+      // Add metadata if provided
+      if (metadata && Object.keys(metadata).length > 0) {
+        for (const [key, value] of Object.entries(metadata)) {
+          formData.append(`metadata.${key}`, String(value))
+        }
+      }
+
       const directUploadResponse = await fetch(
         `https://api.cloudflare.com/client/v4/accounts/${CLOUDFLARE_ACCOUNT_ID}/images/v2/direct_upload`,
         {
           method: 'POST',
           headers: {
             'Authorization': `Bearer ${CLOUDFLARE_IMAGES_API_TOKEN}`,
-            'Content-Type': 'application/json',
           },
-          body: JSON.stringify({
-            requireSignedURLs: false,
-            metadata: metadata
-          }),
+          body: formData,
         }
       )
 
@@ -143,7 +150,7 @@ serve(async (req) => {
     return new Response(
       JSON.stringify({ 
         error: 'Internal server error', 
-        message: error.message 
+        message: error instanceof Error ? error.message : 'Unknown error'
       }),
       { 
         status: 500,