feat: P4 多模态 — 图片上传 + 沙盒 vision 支持

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后端:
- ChatMessage 接口支持 text | image_url 多部分内容
- sandbox chat 接受 images[] 参数
- 自动将图片转为 image_url 格式发送到 AI
- 上传模块支持 jpg/png/gif/webp/svg

前端:
- 沙盒输入区 + 图片上传按钮
- 图片缩略图预览 + 删除
- 上传后随消息发送到 API
- uploads/ 目录持久化存储

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yuzhiran-dev

2026-05-18 14:15:56 +08:00

parent 0ed017b212

commit 79d7535c1c

6 changed files with 71 additions and 15 deletions

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backend/tsconfig.tsbuildinfo

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