Harvest #2895 for the v0.8.59 release lane. SiliconFlow CN now reads its own providers.siliconflow_cn / providers.siliconflow-CN table and falls back to providers.siliconflow only when api_key, base_url, or model are unset.
Maintainer amendments wire the TUI fallback paths, provider config get/set/unset/redaction surfaces, env override routing, model normalization, tests, and changelog credit.
Fixes#2893.
Reported-by: Artenx <18120598+Artenx@users.noreply.github.com>
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