feat: Add Podcast Feature

[EswarDivi]

Add Podcast Feature

Added /api/podcast and /api/conversation endpoints for audio and text-based conversational summaries.

Changes

• /api/podcast: Returns JSON with podcast URL and timestamp
• /api/conversation: Returns JSON conversation between two experts
• Generates conversational dialogue between "Brian" and "Jenny"
• Uses OpenAI TTS to create MP3 audio files
• Stores audio in Vercel Blob storage with Redis caching

Example Response

/api/podcast:

{
  "podcast_url": "https://u04kue5aophtsfj1.public.blob.vercel-storage.com/16_09_2025_podcast.mp3",
  "timestamp": "2025-09-16T16:49:53Z"
}

/api/conversation:

{
  "conversation": [
    {"speaker": "Brian", "text": "Today we're looking at some fascinating AI research..."},
    {"speaker": "Jenny", "text": "Absolutely! The first paper caught my attention because..."}
  ]
}

[vercel]

@EswarDivi is attempting to deploy a commit to the Takara-ai Frontier Research Team on Vercel.

A member of the Team first needs to authorize it.