List available models

For openai/anthropic this fetches the provider's live models API and falls back to a static built-in list on any failure. ollama lists what's pulled locally.

Responses

{
  "provider_name": "ollama",
  "models": [ { "name": "qwen2.5-coder:latest", "provider": "ollama" } ]
}

{ "detail": "could not reach provider to list models" }