Fixes#3079
## Summary
When dragging a local file from Windows to an SSH remote connection, the
full Windows path (e.g. `D:\package\AA.tar`) was being passed to
`filepath.Base` on the remote (Linux) side. Since `filepath.Base` on
Linux does not recognize backslashes as separators, the full path was
used as the destination filename.
- In `RemoteFileCopyCommand` (`wshremote_file.go:159`), replace
`filepath.Base(srcConn.Path)` with `fspath.Base(srcConn.Path)`
- `fspath.Base` calls `ToSlash` before `path.Base`, converting
backslashes to forward slashes first, so `D:\package\AA.tar` correctly
yields `AA.tar` on any OS
- Same-host copies at line 86 use `filepath.Base(srcPathCleaned)` and
are unaffected — those run on the same OS where `filepath.Base` is
correct
## Test Plan
- Added `pkg/remote/fileshare/fspath/fspath_test.go` with table-driven
tests for `fspath.Base`:
- Windows path with backslashes: `D:\package\AA.tar` → `AA.tar`
- Windows path with forward slashes: `D:/package/AA.tar` → `AA.tar`
- Unix path: `/home/user/file.txt` → `file.txt`
- Filename only: `file.txt` → `file.txt`
- `go test ./pkg/remote/fileshare/fspath/...` passes
Signed-off-by: majiayu000 <1835304752@qq.com>
0b29c49076