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fix: resolve auth state persistence and login redirect bug

fix: add connect-mongo persistent session store to fix OAuth state loss on Render

fix: use VITE_API_URL for OAuth links so they point to Render backend in production

fix: add root package.json and vercel.json for monorepo Vercel deployment

fix: add vercel-build script to override Next.js auto-detection

fix: set Vite build config in client vercel.json to prevent Next.js misdetection

🚀 Add Vercel deployment configuration

✨ Add multi-key Gemini API rotation with automatic failover

🎓 Initial commit — ScholarAI full-stack academic toolkit