feat: live SSH terminal in drawer (xterm.js + asyncssh WebSocket)
Adds a Terminal tab to the log drawer with a full PTY session bridged
over WebSocket to the TrueNAS SSH host. xterm.js loaded lazily on
first tab open. Supports resize, paste, full color, and reconnect.
- app/terminal.py: asyncssh PTY ↔ WebSocket bridge
- routes.py: @router.websocket("/ws/terminal")
- dashboard.html: Terminal tab + drawer panel
- app.js: xterm.js lazy load, init, onData, resize observer, reconnect
- app.css: terminal panel styles (no padding, overflow hidden)
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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