#740 Verify Vault has LLM API keys for K8s deployment

After adding LLM API keys to Helm templates (api-deployment.yaml, worker-deployment.yaml), need to verify the Vault path 'highway/data/shared/api_keys' contains: Required keys: - ollama_api_key (for Ollama Cloud generation) - openai_api_key (optional fallback) - anthropic_api_key (optional) - gemini_api_key (optional) - grok_api_key (optional) - qwen_api_key (optional) The generate-workflow endpoint uses ragit which needs OLLAMA_API_KEY environment variable to authenticate with Ollama Cloud (https://ollama.com). See: engine/rag/assistant.py, helm/templates/api-deployment.yaml lines 46-53