- Add pkg/db models and CRUD methods for workflows - Add internal/routing canvas validator (DAG check, connectivity) - Add internal/routing canvas converter (Canvas → WorkflowSpec) - Register LLMInferenceActivity and LLMBatchInferenceActivity - Update api/server and cmd/server with database integration - Add K8s environment variable support - Update activity knowledge base with LLM activities - Add .env.example configuration template
