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feat: add Amvera Cloud deployment support — update amvera.yaml, add Prisma generation to build script, create deployment guide
fix: add Zod validation to API routes, cache headers, schema parity script, and enhance error handler tests
feat: multi-database support (SQLite, PostgreSQL, MongoDB) with auto-detection
feat: add migration safety check script (npm run db:check)
feat: centralized request/response logging in withErrorHandler and middleware
fix: resolve bugs and add demo mode banner