Open WebUI's OpenAI connection to LiteLLM was silently 401ing on every
request (OPENAI_API_KEY=dummy vs LiteLLM's real master key), so none of
the litellm-routed models (judge, tip-generator, kimi-agent, OpenRouter
free tier) ever appeared in the model picker -- only the direct Ollama
connection's models did. Key is now sourced from openwebui/.env
(gitignored), matching the langfuse key pattern already used elsewhere.
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