Fix: Use BLABLADOR_API_KEY for Helmholtz endpoint

app/api/text-generation/route.ts

@@ -3,7 +3,7 @@ import { createOpenAI } from '@ai-sdk/openai';
 
 // Create an OpenAI API client (that's edge friendly!)
 const customOpenAI = createOpenAI({
-  apiKey: process.env.HELMHOLTZ_API_KEY || '',
+  apiKey: process.env.BLABLADOR_API_KEY || '',
   baseURL: 'https://api.helmholtz-blablador.fz-juelich.de/v1',
 });