Replace ALB + Lambda architecture with API Gateway REST API + Lambda
using response streaming for SSE support. This provides:
- No VPC required, reducing complexity and cost
- Native streaming support via API Gateway response streaming
- Pay-per-request pricing model
Changes:
- Add Lambda Web Adapter to Dockerfile for streaming support
- Replace BedrockProxy.template with API Gateway configuration
- Update README with new deployment options and latest models
- Update architecture diagram for API Gateway flow
- Run Docker container as non-root user (appuser) to minimize security risks
- Add Docker HEALTHCHECK for better container orchestration
- Make CORS configurable via ALLOWED_ORIGINS env var with security warning
- Replace assertions with proper error handling (TypeError/ValueError)
- Add 30s timeout to HTTP requests to prevent hanging connections
- Disable auto-reload in production uvicorn settings
