moran 2d302a006e feat(image-generation): add StepFun provider support and StepPlan docs
- Add StepFunImageGenerationClient with step-image-edit-2 / step-1x-medium support
- Map aspect ratios to StepFun size strings (WxH order)
- Add style_reference for step-1x-medium reference-image generation
- Register in image gen provider registry (auto-discovered by nanobot.py)
- Add 7 unit tests: payload, default size, explicit size, style_reference (1x/non-1x), missing key, no-images
- Add StepFun section to docs/image-generation.md with provider config
- Add StepPlan (订阅制) subsection with apiBase override example
2026-05-20 00:08:38 +08:00
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