Refactor: Consolidate AI providers to Blablador (1/5)

lib/ai/blablador-provider.ts

@@ -0,0 +1,12 @@
+import { createOpenAI } from '@ai-sdk/openai';
+
+export const blabladorProvider = createOpenAI({
+  apiKey: process.env.BLABLADOR_API_KEY || '',
+  baseURL: 'https://api.openai.com/v1', // Trick the SDK
+  fetch: async (url, options) => {
+    const newUrl = url.toString().replace('https://api.openai.com/v1', 'https://api.helmholtz-blablador.fz-juelich.de/v1');
+    return fetch(newUrl, options);
+  },
+});
+
+export type BlabladorClient = typeof blabladorProvider;