docs: Document dynamic model fetching feature

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Summary

Recently merged PR #12046 added support for dynamically fetching provider models. This feature needs documentation.

Feature Details (from PR #12046)

• Unified dynamic model fetching across providers via a core models/fetch protocol
• Auto-loads models from ollama and openrouter providers
• Refresh button appears after entering API key to fetch provider models
• Merges and de-duplicates fetched models with hardcoded ones
• Persists contextLength, maxTokens, and capabilities to config.yaml when adding a model
• Supports anthropic, gemini, ollama, openrouter, and providers using listModels()

Suggested Documentation

• Add a section in /docs/customize/models.mdx or a new guide explaining:
  • How to use the dynamic model fetching feature
  • Which providers support dynamic fetching
  • How the refresh button works in the GUI
  • What model properties are automatically detected and saved

Related

• PR: feat: fetch provider models dynamically and fix isOpenSource pollution #12046
• Merged: 2026-04-08

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Co-Authored-By: Continue noreply@continue.dev
Co-authored-by: bekahhw rhawrot@gmail.com