Split SiliconflowCN into its own [providers.siliconflow_cn] TOML section
instead of silently ignoring [providers.siliconflow-CN] config.
- ProvidersToml / ProvidersConfig: add siliconflow_cn field with serde alias
- for_provider / for_provider_mut / provider_config_for: route SiliconflowCN
to the new field
- resolve_runtime_options_with_secrets: fallback siliconflow_cn → siliconflow
for api_key / base_url / model when unset
- deepseek_api_key: add config-file fallback for SiliconflowCn
- provider_config_key: update metadata to "siliconflow_cn"
- save_api_key_for: write SiliconflowCn keys to providers.siliconflow_cn
- docs/PROVIDERS.md, config.example.toml, scripts/check-provider-registry.py
Hanmiao Li
b291214cd2