[Good First Issue] Add export functionality for debate transcripts (JSON/PDF)

[pixelstrade-dev]

Description

Users should be able to export debate transcripts and scores for offline analysis and reporting.

What to do

1. Create an /api/debate/[id]/export endpoint
2. 2. Support JSON export with all turns, agents, and scores
3. 3. Support PDF export with formatted debate transcript
4. 4. Add export buttons to the debate detail page
5. 5. Include score summary and metrics in exports

Skills needed

• TypeScript / Next.js API routes
• • PDF generation (jsPDF or similar)

References

• Debate API: apps/web/app/api/debate/[id]/route.ts