feat(files-api): Support DeepSeek Files API - #250
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支持将图片上传到 DeepSeek Files API，并在对话中通过 file_id 引用， 而非嵌入 base64 data URL，降低请求体积与 token 消耗。 - 通过 experimental.filesApi 开关启用，仅对 vision-exp 模型和官方端点生效 - 图片按内容寻址本地缓存并去重，有效期内复用同一 file_id - 新增定期清理机制与清空云端缓存命令，避免缓存无限增长
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- 删除 filesApi.ts 中未使用的 imageFound 变量（oxlint 报错） - 按 oxfmt 0.47 格式化 i18n.ts、request.ts、filesApi.ts、commands.ts - 消除 CI 的 lint 与 format:check 失败
- 清空云端缓存后同步清空本地 image-cache，避免复用已删除的 file_id 导致 400 - await withProgress 使 try/catch 能真正捕获清空失败 - 上传链路透传 CancellationToken，支持按 Esc 中断; 修正 listener 泄漏
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我是小白，第一回用PR，而且还是deepseek写的代码，个人只是提供了一些思路，感觉代码质量应该不高，故只用了Draft PR
这个feature支持将图片上传到 DeepSeek Files API，并在对话中通过 file_id 引用，
而非嵌入 base64 data URL，降低请求体积与 token 消耗。
I'm a beginner, this is my first PR, and the code was written by deepseek. I only provided some ideas, so I'm not confident about the code quality — that's why I used a Draft PR.
This feature allows uploading images to the DeepSeek Files API and referencing them in conversations via file_id, instead of embedding base64 data URLs, which reduces request size and token consumption.
Enabled via the experimental.filesApi flag, effective only for vision-exp models and the official endpoint
Images are content-addressed, locally cached and deduplicated; the same file_id is reused within its validity period
Added a periodic cleanup mechanism and a command to clear the cloud cache, preventing the cache from growing indefinitely