Fix: Add API proxy through Next.js rewrites for Hugging Face deployment

Fix TypeScript error: Add ai_image property to Slide interface

Fix TypeScript error: Make COLORS arrays const tuples for spread operator

Fix TypeScript errors in downloads.ts: Match types for Summary and DebateAnalysis

Fix TypeScript error: Update exportSummaryAsPDF to handle Summary object type

Initial commit: Sage AI with rate limiting and deployment configs