fix langfuse directions

[rgarcia]

I wasn't seeing any traces in langfuse until I switched to setting serviceName to "ai" to satisfy their logic here: https://github.com/langfuse/langfuse-js/blob/a626f4631bb537afbb2c8b84d6b5078a73d8cb61/langfuse-vercel/src/LangfuseExporter.ts#L255

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