feat: show host metrics speedbar in monit dashboard

[ButchAnton]

What

pm2 status/pm2 ls already print a "host metrics" line (CPU, RAM, disk, network, etc.) when pm2:sysmonit is enabled, but pm2 monit/pm2 dashboard never showed it, even though the same getSystemData data is available there too. This adds the same line to the dashboard, directly below the existing help/shortcuts bar.

Details

• lib/API/Extra.js: dashboard() now also polls getSystemData on its own 2s interval (independent of the existing 800ms per-process getMonitorData poll, since host metrics are a daemon-wide snapshot, not per-process) and forwards the result to Dashboard.refreshSystemData().
• lib/API/Dashboard.js:
  • New speedbarBox widget, hidden by default.
  • New Dashboard.refreshSystemData() renders the line (ported from miniMonitBar() in lib/API/UX/pm2-ls.js, same thresholds/colors, just blessed content tags instead of chalk/ansis) and calls a new setSpeedbarLayout() helper.
  • setSpeedbarLayout() toggles between two fixed layouts so the bar only takes up space when there's actually data to show: when pm2:sysmonit is off (or hasn't reported yet), metadataBox/metricsBox/box4 sit exactly where they do today and speedbarBox is hidden - no permanent dead space. When data arrives, metadataBox/metricsBox shrink slightly and box4 moves up to make room for the bar. screen.realloc() is called on each transition so blessed does a full repaint instead of leaving stale borders/content from the previous layout (its incremental diff render only marks cells dirty on content changes, not dimension changes).
  • While sizing the new layout, this also happens to fix a pre-existing cosmetic bug: box4's stock top: '95%', height: '6%' ends at 101%, one point past both the screen and past metadataBox/metricsBox's own bottom edge (70% + 26% = 96%). At certain terminal row counts (rounding-dependent, e.g. exactly 50 rows) that 1% overlap causes box4 to paint over the bottom border of the metadata/custom metrics panels, since it's appended after them. Both states now use 25%/5% instead of 26%/6%, which closes the gap everywhere rather than only at the row counts stock pm2's rounding happens to dodge it at.

Testing

Manually verified against a scratch PM2_HOME in a tmux session at a few terminal sizes:

• pm2:sysmonit on: speedbar renders below the help line with correct data/colors, no border clipping.
• pm2:sysmonit off: layout matches current stock pm2 exactly, no empty reserved line.
• Toggling on/off (via daemon restart) transitions cleanly with no stale artifacts.

Happy to add/adjust automated coverage if there's a preferred pattern for dashboard/blessed-UI tests in this repo - I didn't see existing ones to follow for lib/API/Dashboard.js.

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