feat: modelslab provider integration

[devsahm]

Add ModelsLab Provider Integration

Overview

Adds ModelsLab as a new provider supporting images, audio, text, and streaming capabilities.

Links

• ModelsLab Website
• ModelsLab API Documentation

Features

Image Generation

• Text-to-image generation
• Image-to-image transformation
• Async polling for results

Audio

• Text-to-speech (TTS)
• Speech-to-text (STT)
• Async polling for results

Text Generation

• Standard chat completions
• Configurable parameters: temperature, topP, maxTokens

Streaming

• SSE-based streaming with delta events
• Real-time response delivery

Implementation Details

• Async Operations: Poll fetch_result endpoints until completion
• Error Handling: Robust handling of ModelsLab's error
• Image Output: URLs returned from async results
• Audio Output: Base64-encoded audio data

Files Added

src/Providers/ModelsLab/
├── Provider implementation
├── Request handlers
└── Model maps

tests/Providers/ModelsLab/
└── Full test coverage

docs/providers/modelslab.md
└── Usage documentation

Testing

• ✅ Unit tests for all capabilities
• ✅ Integration tests for async operations
• ✅ Error handling scenarios covered

Documentation

Complete usage documentation available in docs/providers/modelslab.md