fix: propagate Shopify 404 through upload route so client retry triggers correctly

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/app/api/images/upload/route.ts

@@ -26,6 +26,7 @@ export async function POST(req: NextRequest) {
     return NextResponse.json(result)
   } catch (err) {
     const message = err instanceof Error ? err.message : 'Erreur inconnue'
-    return NextResponse.json({ error: message }, { status: 500 })
+    const status = (err as { status?: number }).status === 404 ? 404 : 500
+    return NextResponse.json({ error: message }, { status })
   }
 }

src/lib/shopify.ts

@@ -161,6 +161,12 @@ export async function uploadProductImage(
       continue
     }
 
+    if (res.status === 404) {
+      const err = new Error(`Shopify upload error: 404 — product not found`) as Error & { status: number }
+      err.status = 404
+      throw err
+    }
+
     if (!res.ok) {
       const body = await res.text()
       throw new Error(`Shopify upload error: ${res.status} — ${body}`)