Resolved conflicts in:
- apps/web/app/api/generate/route.ts: Keep playgroundCatalog import
- apps/web/components/playground.tsx: Use Spec type from @json-render/core

- Test generateSystemPrompt with components, actions, custom rules
- Test new defineCatalog API from schema system
- Test catalog.prompt() method with custom rules
- Test catalog.validate() for valid and invalid specs
- Test catalog.zodSchema() for custom validation
- Test catalog.jsonSchema() for structured outputs
- Add tests for nested specs with children
- Add tests for rejecting invalid component types

Change from children={...} prop to nested children pattern
to satisfy react/no-children-prop rule.

- Disable react/prop-types in both eslint configs (TypeScript handles this)
- Allow styled-jsx 'jsx' property in dashboard
- Add DATABASE_URL to turbo env allowlist
- Remove unused drizzle-orm imports (and, sql)
- Suppress unused variable warnings where intentional

The main package entry includes React components that require
client-side context (React.createContext). This causes build
failures when importing in server-side API routes.

Added `@json-render/remotion/server` entry point that exports
only schema and catalog definitions without React dependencies:
- schema, RemotionSchema, RemotionSpec
- standardComponentDefinitions, standardTransitionDefinitions
- standardEffectDefinitions
- Type exports for catalogs

Updated remotion example to import from /server in catalog.ts

The database connection threw an error at module load time if
DATABASE_URL was not set, causing builds to fail in CI where
the database is not available.

Changed to lazy initialization using a Proxy so the error only
occurs when the database is actually used at runtime, not at
build time.

- Fix property name mismatch: playground now passes previousSpec
  instead of previousTree to match what useUIStream hook expects
- Make rate limiting lazy-initialized to avoid runtime errors when
  Redis env vars (KV_REST_API_URL, KV_REST_API_TOKEN) are not set
- Rate limiting gracefully becomes a no-op when Redis is unavailable