Summary

• Add SiliconFlow CN and Global as selectable OpenAI-compatible LLM providers.
• Wire both providers into settings metadata, runtime provider capability mapping, and CLI onboarding.
• Add focused tests for provider defaults, env mapping, and settings persistence.

Why

SiliconFlow provides OpenAI-compatible MaaS API endpoints for both China and Global users. Exposing both endpoints as first-class provider presets lets users configure SiliconFlow without manually overriding provider/base URL settings.

Changes

• Added siliconflow-cn with default endpoint https://api.siliconflow.cn/v1.
• Added siliconflow-global with default endpoint https://api.siliconflow.com/v1.
• Set both presets to the SiliconFlow model id deepseek-ai/DeepSeek-V3.1-Terminus.
• Added provider capability mappings so both presets map their provider-specific env vars into the OpenAI-compatible runtime path.
• Added both providers to legacy and interactive CLI onboarding.
• Added focused regression coverage for provider defaults, CLI onboarding metadata, runtime env mapping, and settings API persistence.

Test Plan

• Existing tests pass (pytest --ignore=agent/tests/e2e_backtest --tb=short -q)
• New tests added (if applicable)
• Tested manually (describe below)

Focused validation run locally:

python -m pytest agent/tests/test_settings_api.py -k siliconflow -q

Result:

2 passed, 18 deselected, 5 warnings

python -m pytest agent/tests/test_llm_provider_defaults.py agent/tests/test_llm.py -k siliconflow -q

Result:

3 passed, 39 deselected

I did not run the full test suite locally.

• No changes to protected areas (src/agent/, src/session/, src/providers/) without prior discussion
• No hardcoded values (API keys, file paths, magic numbers)
• Code follows CONTRIBUTING.md guidelines
• Documentation updated (if user-facing change)