fix: cast meta.json() to typed interface to fix TS18046 strict error

apps/api/src/routes/whatsapp.ts

@@ -133,7 +133,8 @@ export async function whatsappRoutes(fastify: FastifyInstance) {
                                     const metaRes = await fetch(`https://graph.facebook.com/v18.0/${audioId}`, {
                                         headers: { 'Authorization': `Bearer ${accessToken}` }
                                     });
-                                    const meta = await metaRes.json();
+                                    const meta = await metaRes.json() as { url?: string };
+
 
                                     // 2. Download binary media
                                     if (meta.url) {