fix(net): unexpected write

[j2rong4cn]

• Close 某些存储驱动开启“本地代理”时，如果下载文件时网络中断，那么下载的文件会损坏 #8281

[Copilot]

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

Comments suppressed due to low confidence (2)

server/webdav/webdav.go:61

• [nitpick] Variable 'Writer' should use lowerCamelCase (e.g., 'writer') to follow Go naming conventions.

Writer := &common.WrittenResponseWriter{ResponseWriter: w}

server/handles/down.go:131

• [nitpick] Variable 'Writer' should be renamed to 'writer' for consistency with Go naming conventions.

Writer := &common.WrittenResponseWriter{ResponseWriter: c.Writer}