feat: add LLM Router component using OpenRouter specs

[raphaelchristi]

Description

This PR adds a new LLM Router component that intelligently routes queries to the most appropriate language model based on OpenRouter specifications and task requirements.

Features

• Automatic model specification fetching from OpenRouter API
• Dynamic model selection based on task complexity and requirements
• Multiple optimization modes (quality, speed, cost, balanced)
• Robust error handling with fallback mechanisms

Usage

1. Connect multiple LLM models to the router
2. Add a judge LLM for selection
3. Provide input message
4. Select optimization preference
5. Router will automatically select and use the most appropriate model