Add BloxServer API scaffold + architecture docs
BloxServer API (FastAPI + SQLAlchemy async):
- Database models: users, flows, triggers, executions, usage tracking
- Clerk JWT auth with dev mode bypass for local testing
- SQLite support for local dev, PostgreSQL for production
- CRUD routes for flows, triggers, executions
- Public webhook endpoint with token auth
- Health/readiness endpoints
- Pydantic schemas with camelCase aliases for frontend
- Docker + docker-compose setup
Architecture documentation:
- Librarian architecture with RLM-powered query engine
- Stripe billing integration (usage-based, trials, webhooks)
- LLM abstraction layer (rate limiting, semantic cache, failover)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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