- Created api-gateway application structure
- Added pyproject.toml with FastAPI, httpx, and aitbc-core dependencies
- Implemented main.py with routing logic to proxy requests to microservices
- Added service registry for GPU, Marketplace, Agent, Trading, Governance, and Coordinator services
- Configured middleware (request ID, performance logging, validation, error handling)
- Created systemd service file for api-gateway
- Added README.md with service registry information
This completes Phase 4.2: Create FastAPI gateway for routing
