Implements Manager which orchestrates WinBox tunnel lifecycle: open,
close, idle cleanup, and status queries. Uses PortPool and Tunnel from
Tasks 1.2/1.3. DeviceStore and CredentialCache wired in for Task 1.5.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Implements Tunnel type that listens on a local port, accepts WinBox client
connections, dials the remote RouterOS device, and proxies traffic
bidirectionally. Uses activityReader to atomically update LastActive on
each read for idle timeout detection. Per-connection contexts derive from
the tunnel context so Close() terminates all connections cleanly.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Implements PortPool with mutex-protected allocation, bind verification
to skip ports already in use by the OS, and release-for-reuse semantics.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
