Setup: Prisma schema, shadcn/ui config, dark theme, and landing page

[Mathieu-bot]

Summary

• Prisma: Schema with 9 models (Venue, Event, Room, Session, Speaker, etc.), initial PostgreSQL migration, and full seed script (5 venues, 7 events, 14 rooms, 5 speakers, 31 sessions)
• shadcn/ui: Config, cn() utility, and typing-animation component
• Theme: Dark chartreuse palette replacing the old cream theme
• Landing page: Redesigned with lucide-react icons
• Deps: Added clsx, tailwind-merge, lucide-react, motion; replaced ts-node with tsx; added Prisma scripts
• Assets: Speaker photos and event image

npm run build  ✅  (20 routes, 0 errors)