[Feature] Fetch models list directly from API, where supported

[Renset]

Reference Issues

No response

Summary

As macai user, I would like to select the available model from list and avoid using custom model function.

Many LLM APIs already provide API endpoints to get the list of API models supported for the specific API key. This will improve the experience of setting up new API services. It's recommended to cache the list of models locally, either in CoreData or AppStorage.

Basic Example

OpenAI: https://platform.openai.com/docs/api-reference/models/list
Claude: https://docs.anthropic.com/en/api/models-list
xAI: https://docs.x.ai/docs/api-reference#list-models
Google Gemini: https://ai.google.dev/api/models#method:-models.list
Ollama: https://ai.google.dev/api/models#method:-models.list
Perplexity: Unknown
OpenRouter API: https://openrouter.ai/docs/models

Drawbacks

No response

Unresolved questions

No response