remotefs-rs / remotefs-rs-ssh / 23363453241

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perf: buffer entire file in libssh SFTP reads to reduce round-trips

Replace the streaming SftpFileReader (one SFTP round-trip per read()
call) with a buffered approach that reads the entire file into memory
using a 256 KiB buffer before returning. This pre-fetches the file data
in open_read() rather than deferring reads to the caller's smaller
64 KiB buffer loop, reducing total round-trips.

Unlike the russh backend which uses true concurrent pipelining (multiple
file handles reading different chunks via tokio::spawn), this approach
is still sequential due to libssh-rs serializing all operations through
a session-level mutex. True pipelining would require the AIO FFI
(sftp_aio_begin_read/sftp_aio_wait_read) which libssh-rs does not
expose at the safe API level.

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