Feat(openrouter): Adds OpenRouter API support

[denrusio]

Summary

This PR adds support for OpenRouter API, enabling access to 400+ AI models through a single unified API endpoint.

Changes

• Added OpenRouter configuration to PROVIDER_MODELS dictionary with latest August 2025 models
• Added openrouter prefix to PROVIDER_MODELS_PREFIXES for automatic API key handling
• Added OPENROUTER_API_KEY to .env.txt example file
• Added support for latest models including:
  • OpenAI GPT-4o, O1/O3/O4 mini models
  • Anthropic Claude 4 series (Opus, Sonnet)
  • Google Gemini 2.5 Pro and Flash
  • DeepSeek Chat V3
  • xAI Grok 3 and 4

Usage

Users can now use OpenRouter models by:

1. Setting the OPENROUTER_API_KEY environment variable
2. Using provider format: openrouter/vendor/model-name

Example:

from crawl4ai import LLMConfig

llm_config = LLMConfig(
    provider="openrouter/anthropic/claude-sonnet-4",
    api_token=os.getenv("OPENROUTER_API_KEY")
)

Benefits

- Access to 400+ models through single API
- Cost optimization by choosing appropriate models
- No need for multiple API keys from different providers
- Seamless integration with existing crawl4ai workflow

Testing

The integration leverages the existing litellm library which has native OpenRouter support. No additional dependencies required.

Related

- OpenRouter documentation: https://openrouter.ai/docs
- Available models: https://openrouter.ai/models

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[gpercem]

It would be way better if we can give the model name instead