- Add fetchModelsDevProviderModels() function with 1-hour caching
- Update ensureOpencodeConfig() to dynamically load all models for configured providers
- Support Chutes, Cerebras, Groq, Google, and Nvidia providers
- Only fetch models for providers actually used in adminModels
- Cache models.dev data to reduce API calls and improve performance
This allows any model from models.dev to work when added in the admin panel,
instead of requiring hardcoded model definitions.