PaiSwitch

Use StepFun image APIs to generate Chinese technical illustrations, article images, whiteboard infographics, WeChat public-account covers, Bilibili knowledge covers, and Itwanger-style teaching graphics when Codex built-in image_gen is unavailable or the current Codex model/provider is Step 3.7 Flash, StepFun, or another non-OpenAI provider. Trigger for requests like "用 Step 生图", "StepFun 生成图片", "切到 Step 3.7 Flash 后生图", "不要用 Codex image_gen", "二哥风格配图但走 Step 接口", and "step-image".