feat: add Novita AI as LLM provider

[Alex-wuhu]

Summary

Add Novita AI as a new LLM provider. Novita offers an OpenAI-compatible API with competitive pricing and a wide selection of open-source models.

Changes

• New Novita provider following existing provider patterns
• API key configuration via NOVITA_API_KEY environment variable
• Support for chat, completion, and embedding models

Configuration

NOVITA_API_KEY=your_key_here

Endpoint: https://api.novita.ai/openai

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[Chenglong-MS]

that's awesome! Can you update the code with respect to the new dev branch? We are pushing this staging branch to main today

[Alex-wuhu]

that's awesome! Can you update the code with respect to the new dev branch? We are pushing this staging branch to main today

Got it will do!