- Added comprehensive logging for OpenAI API calls and responses in both AltTextGenerator and MetadataGenerator
- Updated OpenAI model from gpt-5-2025-08-07 to gpt-4o and standardized completion parameters
- Implemented fallback mechanisms for handling empty or invalid AI responses
- Added buildFallback methods to generate reasonable defaults from input text
- Enhanced MetadataGenerator with smart title/tag derivation and URL slugification
- Added streaming UI components with live content preview and token counter
- Implemented new generateContentStream service for SSE-based content generation
- Created comprehensive STREAMING_UI_GUIDE.md documentation with implementation details
- Added streaming toggle checkbox with default enabled state
- Enhanced StepGenerate component with progress bar and animated streaming display
- Added error handling and graceful fallback for streaming failures
- Split monolithic ai-generate.ts (453 lines) into 12 focused modules with clear responsibilities
- Created new directory structure with routes, services, utils, types, and config folders
- Implemented AIService orchestrator with specialized generators for content, metadata, and alt text
- Added centralized prompt templates and error handling
- Set up parallel routing to allow gradual migration from old implementation
