SSH Manager 2.1.0

Adds a FileZilla-style SFTP transfer panel showing the active filename, current-file bytes, overall percentage, completed/total files, remaining bytes, speed, and ETA. Small-file batches now use up to four SFTP channels, skip the redundant post-upload stat round trip, use bounded download prefetching, and throttle UI updates. The main Refresh Both action reloads both the local and remote current folders. Includes the complete offline amd64 runtime.