Changes

PR #1572 by ksylvan: Add Image Generation Support to Fabric

• Add image generation support with OpenAI image generation model and --image-file flag for saving generated images
• Implement web search tool for Anthropic and OpenAI models with search location parameter support
• Add comprehensive test coverage for image features and update documentation with image generation examples
• Support multiple image formats (PNG, JPG, JPEG, GIF, BMP) and image editing with attachment input files
• Refactor image generation constants for clarity and reuse with defined response type and tool type constants

Direct commits

• Fixed ul tag applier and updated ul tag prompt
• Added the UL tags pattern