feat(Dynamic Models): Added Together AI Dynamic Models

[thecodacus]

Add Support for Together AI Models & Dynamic Models List

Overview

This PR enhances our LLM integration by adding support for Together AI models and implementing improved API key management across different providers. The changes include dynamic model loading based on API keys and TypeScript improvements for better type safety.

Key Changes

1. Together AI Integration

• Implemented dynamic model fetching from Together AI API
• Added support for Together model pricing and context window information

2. API Key Management

• Improved API key handling across client and server

3. Type Safety Improvements

• Removed @ts-nocheck comments and implemented proper TypeScript types
• Added type definitions for API responses and configurations
• Improved type safety in model management functions
• Added TypeScript interfaces for provider configurations

4. Model List Management

• Refactored model list initialization to support dynamic updates
• Added support for provider-specific model fetching

Technical Details

Dynamic Model Loading

• Implemented getModelList function to fetch models from all providers (can be used in server side)
• Added provider-specific model fetching logic

API Key Integration

• Created unified API key management system (fetch apikeys from cookies in both client and server-side )
• Improved error handling for missing API keys

Testing

• Tested model fetching with valid API keys
• Verified error handling with invalid API keys
• Tested cookie management
• Verified type safety improvements
• Tested environment variable integration

Migration Notes

• No breaking changes for existing functionality