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3a8ef857ac
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根因（VLM 牛头不对马嘴）：packages/shared/ai_service.call_vision() 之前误用
client.chat_completion（文本模型 doubao-seed-1.6-250615）发送多模态 content list。
文本模型不认图片 content type → 返回 None → _step_image_analysis 的 except
静默吞掉 → fallback 到占位结果 {name:'未识别'} → 后续 intent/copy/storyboard
完全没图信息，自然胡编。
修复：
1) call_vision 改用 client.vision_completion（模型 doubao-1-5-vision-pro-250915），
走标准 OpenAI 多模态 chat/completions + image_url 格式
2) 超时提到 60s，温度降到 0.2，解析 ```json 代码块包裹
3) 增加详细 INFO 日志：打印 vision_model/image_url/prompt_len/原始返回前 400 字，
方便下次直接在 worker 日志排查
4) 重写 _IMAGE_ANALYSIS_PROMPT：强制结构化 JSON schema（category/name/brand/colors/
material_or_texture/key_features/visual_style/scene/target_audience_hint/
text_on_image），明确『无法判断就填无法判断，不许编造』，key_features
只能写外观可见特征、不许编功效
5) _step_image_analysis 健壮化：images 为空/None/文本返回/异常分别落 _source 标记；
每张图独立 try/except，单张失败不影响其他图
6) 下游 intent_parsing/copy_fusion/storyboard 兼容新字段 key_features/brand/
category/colors/visual_style（同时向后兼容旧 features 字段）