Add fal.ai Text-to-Image Generator Node

[shige]

Task description

Implement a Generator Node that integrates with fal.ai to provide Text-to-Image functionality.

Background

This task aims to enhance the application's capabilities by adding a new Generator Node that leverages the fal.ai API for generating images from text prompts. This will allow users to easily create AI-generated images within the application. The following models should be supported:

• Stability AI Image Models — Stability AI
  • https://fal.ai/models?keywords=stable-diffusion&categories=text-to-image
• Ideogram
  • https://fal.ai/models?keywords=ideogram&categories=text-to-image
• Flux AI
  • https://fal.ai/models?keywords=flux&categories=text-to-image
• Recraft
  • https://fal.ai/models?keywords=recraft&categories=text-to-image

Reference:

• AI SDK Providers: Fal

Giselle Team Info: The environment variable FAL_API_KEY is already configured in Vercel.

TODO (Optional)

• Create a new Generator Node class for fal.ai integration.
• Implement API calls to fal.ai using the FAL_API_KEY.
• Support text-to-image generation for the specified models (Stability AI, Ideogram, Flux AI, Recraft).
• Implement error handling for API requests.
• Add unit tests for the new Generator Node.
• Integrate the new Generator Node into the application's UI.

Additional notes (Optional)

Consider potential rate limits and cost implications associated with the fal.ai API. Ensure proper authentication and authorization are in place.