Add fine-tuning availability tracking

[i-need-token]

Description

Track which models support fine-tuning (LoRA, full fine-tuning, etc.) and add a fine_tuning field to the model schema.

Why

Fine-tuning is a critical capability for many production use cases. Users need to know which models support it before committing to a provider.

Suggested Approach

1. Add fine_tuning boolean field to the model schema in types/model.ts
2. Update scrape scripts to detect fine-tuning support from provider APIs
3. Add a docs/fine-tuning-models.md documentation page listing models with fine-tuning support

Data Sources

• OpenAI: https://platform.openai.com/docs/guides/fine-tuning
• Anthropic: Not yet available
• Google: https://ai.google.dev/gemini-api/docs/model-tuning
• Mistral: https://docs.mistral.ai/guides/finetuning/

Labels

good first issue, enhancement