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Detailed step-by-step plan covering: - Monorepo setup with Turborepo + pnpm - Shared package with types and constants - Express API with JWT authentication - Prisma with PostgreSQL multi-tenant (schema per tenant) - Next.js 14 frontend - 4-theme system (Light, Vibrant, Corporate, Dark) - Login/Register pages with auth store - Demo data seed - Docker Compose configuration Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>