Description:

Set up global configurations, environment variable validation, type definitions, and Prisma Client singleton to establish a solid foundation for development.

Tasks:

• Install Zod for environment validation (npm install zod)
• Create src/config/site.ts with site metadata and navigation config
• Create src/config/env.ts with Zod-based environment variable validation
• Create src/types/index.ts with common TypeScript type definitions
• Create src/lib/db/client.ts with Prisma Client singleton pattern
• Verify Prisma Client can be imported and used correctly