Plugin v1.0.2 — stable RDP listener

Fixes the RDP listener instability (#3, PR #6):

• Set DevToolsServer.keepAlive = true so the listener survives when the last client disconnects, instead of self-destroying.
• Replace the destructive 2s reopen loop with a non-destructive TCP probe every 10s that drains the RDP intro packet and only rebuilds the listener when the port genuinely stops answering.

Before/after on a stock install: 35/40 fresh connections refused over 10s vs 0/40; in-flight replies killed within ~250ms vs surviving a 6s pending eval.

Thanks @mjthoraval for the diagnosis, fix, and soak testing.