Common footgun: users set api_provider = \"ollama\" (or vllm /
openrouter / etc.) at the top of config.toml and add a top-level
base_url = \"http://my-server\" alongside it. The root base_url field
is only read for DeepSeek/DeepseekCN (and a back-compat sniff for
NvidiaNim) — for every other provider it's silently ignored, and the
user can't figure out why their override doesn't apply.
Add a one-line tracing::warn at config load time pointing the user at
the matching `[providers.<name>]` table or the corresponding
`*_BASE_URL` env var. Skipped if the per-provider table already has
its own `base_url` (which would win anyway).
No behavior change to URL resolution.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Hunter Bown
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