Add comprehensive documentation for the Pollinations.ai provider integration,
including:
- Getting API keys from enter.pollinations.ai
- Configuration examples with POLLINATIONS_API_KEY
- Available models (text, image, video generation)
- Authentication methods and security best practices
- Pricing information (Pollen credits system)
- Troubleshooting guide
Pollinations provides a unified OpenAI-compatible API gateway for accessing
multiple AI providers (GPT-5, Claude, Gemini, Flux, etc.) through a single
endpoint.
Fixes#2446
Co-Authored-By: Warp <agent@warp.dev>
