endpoint: https://llm-gateway.example.com/v1
api_key: ""            # optional; env LLMTB_API_KEY wins
models:
  - uni/deepseek-v4-flash-0731
  - uni/qwen3.6-27b
  - uni/btl-4
concurrency: 4
request_timeout: 120s
max_tokens_default: 4000