k88936
c64bfc3867
3D 预览产物 content type 改为按字节识别
- storage.rs 新增 sniff_preview_content_type（PNG / JPEG / WebP），resolve_artifact_content_type 改为按槽位判定：预览与模型一样先嗅探字节，嗅不出才回落声明值（最终仍回落 image/webp）
- 修掉 provider / CDN 不写或写错 Content-Type 时 PNG 预览被写成 image/webp 并传播到 OSS metadata、asset_object.content_type 与生成结果的问题；对象键扩展名随之正确
- 定向用例重写为「字节优先 / 未知回落」两组，替换原先钉住「预览不嗅探」的用例
- 技术方案与决策记录同步该口径，并记录与其它图片链路（bgfilter / VectorEngine / 生成图落 OSS 适配器）的一致性对照
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